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Web1 day ago · The argument bytes must either be a bytes-like object or an iterable producing bytes.. The byteorder argument determines the byte order used to represent the integer, and defaults to "big".If byteorder is "big", the most significant byte is at the beginning of the byte blogger.com byteorder is "little", the most significant byte is at the end of the byte array Web原创 Python量化交易实战教程汇总. B站配套视频教程观看设计适合自己并能适应市场的交易策略,才是量化交易的灵魂课程亲手带你设计并实现两种交易策略,快速培养你的策略思维能力择时策略:通过这个策略学会如何利用均线,创建择时策略,优化股票买入卖出的时间点。 WebIndividual subscriptions and access to Questia are no longer available. We apologize for any inconvenience and are here to help you find similar resources WebHearst Television participates in various affiliate marketing programs, which means we may get paid commissions on editorially chosen products purchased through our links to retailer sites Web12/10/ · Microsoft pleaded for its deal on the day of the Phase 2 decision last month, but now the gloves are well and truly off. Microsoft describes the CMA’s concerns as “misplaced” and says that ... read more

The argument bytes must either be a bytes-like object or an iterable producing bytes. To request the native byte order of the host system, use sys. byteorder as the byte order value. Return a pair of integers whose ratio is exactly equal to the original integer and with a positive denominator. The integer ratio of integers whole numbers is always the integer as the numerator and 1 as the denominator. The float type implements the numbers. Real abstract base class. float also has the following additional methods.

Return a pair of integers whose ratio is exactly equal to the original float and with a positive denominator. Raises OverflowError on infinities and a ValueError on NaNs.

Return True if the float instance is finite with integral value, and False otherwise:. Two methods support conversion to and from hexadecimal strings. In contrast, hexadecimal strings allow exact representation and specification of floating-point numbers. This can be useful when debugging, and in numerical work. Return a representation of a floating-point number as a hexadecimal string.

For finite floating-point numbers, this representation will always include a leading 0x and a trailing p and exponent. Class method to return the float represented by a hexadecimal string s. The string s may have leading and trailing whitespace. Note that float. hex is an instance method, while float. fromhex is a class method. Case is not significant, and there must be at least one hexadecimal digit in either the integer or the fraction.

This syntax is similar to the syntax specified in section 6. In particular, the output of float. toHexString are accepted by float. Note that the exponent is written in decimal rather than hexadecimal, and that it gives the power of 2 by which to multiply the coefficient. For example, the hexadecimal string 0x3.

Applying the reverse conversion to For ease of implementation and efficiency across a variety of numeric types including int , float , decimal.

Decimal and fractions. Fraction , and all finite instances of float and decimal. Essentially, this function is given by reduction modulo P for a fixed prime P. The value of P is made available to Python as the modulus attribute of sys.

If the resulting hash is -1 , replace it with The particular values sys. inf and -sys. inf are used as hash values for positive infinity or negative infinity respectively. For a complex number z , the hash values of the real and imaginary parts are combined by computing hash z. width - 1. Python supports a concept of iteration over containers. This is implemented using two distinct methods; these are used to allow user-defined classes to support iteration. Sequences, described below in more detail, always support the iteration methods.

One method needs to be defined for container objects to provide iterable support:. Return an iterator object. The object is required to support the iterator protocol described below. If a container supports different types of iteration, additional methods can be provided to specifically request iterators for those iteration types. An example of an object supporting multiple forms of iteration would be a tree structure which supports both breadth-first and depth-first traversal.

The iterator objects themselves are required to support the following two methods, which together form the iterator protocol :. Return the iterator object itself. This is required to allow both containers and iterators to be used with the for and in statements. Return the next item from the iterator. If there are no further items, raise the StopIteration exception.

Python defines several iterator objects to support iteration over general and specific sequence types, dictionaries, and other more specialized forms. The specific types are not important beyond their implementation of the iterator protocol. Implementations that do not obey this property are deemed broken. More information about generators can be found in the documentation for the yield expression. There are three basic sequence types: lists, tuples, and range objects. Additional sequence types tailored for processing of binary data and text strings are described in dedicated sections.

The operations in the following table are supported by most sequence types, both mutable and immutable. The collections. Sequence ABC is provided to make it easier to correctly implement these operations on custom sequence types. This table lists the sequence operations sorted in ascending priority.

In the table, s and t are sequences of the same type, n , i , j and k are integers and x is an arbitrary object that meets any type and value restrictions imposed by s. The in and not in operations have the same priorities as the comparison operations. True if an item of s is equal to x , else False. x not in s. False if an item of s is equal to x , else True.

index x[, i[, j]]. index of the first occurrence of x in s at or after index i and before index j. Sequences of the same type also support comparisons. In particular, tuples and lists are compared lexicographically by comparing corresponding elements. This means that to compare equal, every element must compare equal and the two sequences must be of the same type and have the same length.

For full details see Comparisons in the language reference. Forward and reversed iterators over mutable sequences access values using an index.

That index will continue to march forward or backward even if the underlying sequence is mutated. The iterator terminates only when an IndexError or a StopIteration is encountered or when the index drops below zero.

While the in and not in operations are used only for simple containment testing in the general case, some specialised sequences such as str , bytes and bytearray also use them for subsequence testing:. Values of n less than 0 are treated as 0 which yields an empty sequence of the same type as s. Note that items in the sequence s are not copied; they are referenced multiple times. This often haunts new Python programmers; consider:.

Modifying any of the elements of lists modifies this single list. You can create a list of different lists this way:.

Further explanation is available in the FAQ entry How do I create a multidimensional list? But note that -0 is still 0. If i or j is greater than len s , use len s. If i is omitted or None , use 0. If j is omitted or None , use len s. If i is greater than or equal to j , the slice is empty. When k is positive, i and j are reduced to len s if they are greater. When k is negative, i and j are reduced to len s - 1 if they are greater. Note, k cannot be zero. If k is None , it is treated like 1.

Concatenating immutable sequences always results in a new object. This means that building up a sequence by repeated concatenation will have a quadratic runtime cost in the total sequence length. To get a linear runtime cost, you must switch to one of the alternatives below:.

if concatenating str objects, you can build a list and use str. join at the end or else write to an io. StringIO instance and retrieve its value when complete. if concatenating bytes objects, you can similarly use bytes.

join or io. BytesIO , or you can do in-place concatenation with a bytearray object. bytearray objects are mutable and have an efficient overallocation mechanism. if concatenating tuple objects, extend a list instead.

index raises ValueError when x is not found in s. Not all implementations support passing the additional arguments i and j. These arguments allow efficient searching of subsections of the sequence.

Passing the extra arguments is roughly equivalent to using s[i:j]. index x , only without copying any data and with the returned index being relative to the start of the sequence rather than the start of the slice.

The only operation that immutable sequence types generally implement that is not also implemented by mutable sequence types is support for the hash built-in. This support allows immutable sequences, such as tuple instances, to be used as dict keys and stored in set and frozenset instances. Attempting to hash an immutable sequence that contains unhashable values will result in TypeError. The operations in the following table are defined on mutable sequence types. MutableSequence ABC is provided to make it easier to correctly implement these operations on custom sequence types.

slice of s from i to j is replaced by the contents of the iterable t. del s[i:j]. the elements of s[i:j:k] are replaced by those of t. del s[i:j:k]. removes the elements of s[i:j:k] from the list.

removes all items from s same as del s[:]. creates a shallow copy of s same as s[:]. insert i, x. pop or s. pop i. remove the first item from s where s[i] is equal to x. The optional argument i defaults to -1 , so that by default the last item is removed and returned. remove raises ValueError when x is not found in s. The reverse method modifies the sequence in place for economy of space when reversing a large sequence. To remind users that it operates by side effect, it does not return the reversed sequence.

copy is not part of the collections. MutableSequence ABC, but most concrete mutable sequence classes provide it. New in version 3. Zero and negative values of n clear the sequence. Lists are mutable sequences, typically used to store collections of homogeneous items where the precise degree of similarity will vary by application.

Using a pair of square brackets to denote the empty list: []. Using square brackets, separating items with commas: [a] , [a, b, c]. Using a list comprehension: [x for x in iterable].

Using the type constructor: list or list iterable. iterable may be either a sequence, a container that supports iteration, or an iterator object. If iterable is already a list, a copy is made and returned, similar to iterable[:]. For example, list 'abc' returns ['a', 'b', 'c'] and list 1, 2, 3 returns [1, 2, 3]. If no argument is given, the constructor creates a new empty list, []. Many other operations also produce lists, including the sorted built-in.

Lists implement all of the common and mutable sequence operations. Lists also provide the following additional method:.

Exceptions are not suppressed - if any comparison operations fail, the entire sort operation will fail and the list will likely be left in a partially modified state. sort accepts two arguments that can only be passed by keyword keyword-only arguments :. The key corresponding to each item in the list is calculated once and then used for the entire sorting process. The default value of None means that list items are sorted directly without calculating a separate key value.

The functools. x style cmp function to a key function. reverse is a boolean value. If set to True , then the list elements are sorted as if each comparison were reversed. This method modifies the sequence in place for economy of space when sorting a large sequence. To remind users that it operates by side effect, it does not return the sorted sequence use sorted to explicitly request a new sorted list instance.

The sort method is guaranteed to be stable. A sort is stable if it guarantees not to change the relative order of elements that compare equal — this is helpful for sorting in multiple passes for example, sort by department, then by salary grade.

For sorting examples and a brief sorting tutorial, see Sorting HOW TO. CPython implementation detail: While a list is being sorted, the effect of attempting to mutate, or even inspect, the list is undefined. The C implementation of Python makes the list appear empty for the duration, and raises ValueError if it can detect that the list has been mutated during a sort. Tuples are immutable sequences, typically used to store collections of heterogeneous data such as the 2-tuples produced by the enumerate built-in.

Tuples are also used for cases where an immutable sequence of homogeneous data is needed such as allowing storage in a set or dict instance. Using a pair of parentheses to denote the empty tuple:. Using a trailing comma for a singleton tuple: a, or a,. Separating items with commas: a, b, c or a, b, c. Using the tuple built-in: tuple or tuple iterable. If iterable is already a tuple, it is returned unchanged.

For example, tuple 'abc' returns 'a', 'b', 'c' and tuple [1, 2, 3] returns 1, 2, 3. If no argument is given, the constructor creates a new empty tuple,. Note that it is actually the comma which makes a tuple, not the parentheses. The parentheses are optional, except in the empty tuple case, or when they are needed to avoid syntactic ambiguity. For example, f a, b, c is a function call with three arguments, while f a, b, c is a function call with a 3-tuple as the sole argument.

Tuples implement all of the common sequence operations. For heterogeneous collections of data where access by name is clearer than access by index, collections.

namedtuple may be a more appropriate choice than a simple tuple object. The range type represents an immutable sequence of numbers and is commonly used for looping a specific number of times in for loops. If the step argument is omitted, it defaults to 1.

If the start argument is omitted, it defaults to 0. If step is zero, ValueError is raised. A range object will be empty if r[0] does not meet the value constraint. Ranges do support negative indices, but these are interpreted as indexing from the end of the sequence determined by the positive indices. Ranges containing absolute values larger than sys. maxsize are permitted but some features such as len may raise OverflowError.

Ranges implement all of the common sequence operations except concatenation and repetition due to the fact that range objects can only represent sequences that follow a strict pattern and repetition and concatenation will usually violate that pattern. The value of the start parameter or 0 if the parameter was not supplied. The value of the step parameter or 1 if the parameter was not supplied.

The advantage of the range type over a regular list or tuple is that a range object will always take the same small amount of memory, no matter the size of the range it represents as it only stores the start , stop and step values, calculating individual items and subranges as needed.

Range objects implement the collections. Sequence ABC, and provide features such as containment tests, element index lookup, slicing and support for negative indices see Sequence Types — list, tuple, range :.

That is, two range objects are considered equal if they represent the same sequence of values. Support slicing and negative indices. Test int objects for membership in constant time instead of iterating through all items. The linspace recipe shows how to implement a lazy version of range suitable for floating point applications.

Textual data in Python is handled with str objects, or strings. Strings are immutable sequences of Unicode code points. String literals are written in a variety of ways:. Single quotes: 'allows embedded "double" quotes'. Double quotes: "allows embedded 'single' quotes". Triple quoted: '''Three single quotes''' , """Three double quotes""".

Triple quoted strings may span multiple lines - all associated whitespace will be included in the string literal. String literals that are part of a single expression and have only whitespace between them will be implicitly converted to a single string literal.

Strings may also be created from other objects using the str constructor. There is also no mutable string type, but str. StringIO can be used to efficiently construct strings from multiple fragments. It has no effect on the meaning of string literals and cannot be combined with the r prefix.

Return a string version of object. If object is not provided, returns the empty string. Otherwise, the behavior of str depends on whether encoding or errors is given, as follows.

If neither encoding nor errors is given, str object returns type object. For string objects, this is the string itself. If at least one of encoding or errors is given, object should be a bytes-like object e.

bytes or bytearray. In this case, if object is a bytes or bytearray object, then str bytes, encoding, errors is equivalent to bytes. decode encoding, errors. Otherwise, the bytes object underlying the buffer object is obtained before calling bytes. See Binary Sequence Types — bytes, bytearray, memoryview and Buffer Protocol for information on buffer objects.

Passing a bytes object to str without the encoding or errors arguments falls under the first case of returning the informal string representation see also the -b command-line option to Python. For example:.

For more information on the str class and its methods, see Text Sequence Type — str and the String Methods section below. To output formatted strings, see the Formatted string literals and Format String Syntax sections. In addition, see the Text Processing Services section.

Strings implement all of the common sequence operations, along with the additional methods described below. Strings also support two styles of string formatting, one providing a large degree of flexibility and customization see str. format , Format String Syntax and Custom String Formatting and the other based on C printf style formatting that handles a narrower range of types and is slightly harder to use correctly, but is often faster for the cases it can handle printf-style String Formatting.

The Text Processing Services section of the standard library covers a number of other modules that provide various text related utilities including regular expression support in the re module. This means that characters like digraphs will only have their first letter capitalized, instead of the full character. Casefolding is similar to lowercasing but more aggressive because it is intended to remove all case distinctions in a string. For example, the German lowercase letter 'ß' is equivalent to "ss".

Since it is already lowercase, lower would do nothing to 'ß' ; casefold converts it to "ss". Return centered in a string of length width. Padding is done using the specified fillchar default is an ASCII space. The original string is returned if width is less than or equal to len s. Return the number of non-overlapping occurrences of substring sub in the range [ start , end ]. Optional arguments start and end are interpreted as in slice notation.

If sub is empty, returns the number of empty strings between characters which is the length of the string plus one. Return an encoded version of the string as a bytes object. Default encoding is 'utf-8'. errors may be given to set a different error handling scheme. The default for errors is 'strict' , meaning that encoding errors raise a UnicodeError. Other possible values are 'ignore' , 'replace' , 'xmlcharrefreplace' , 'backslashreplace' and any other name registered via codecs.

For a list of possible encodings, see section Standard Encodings. By default, the errors argument is not checked for best performances, but only used at the first encoding error. Enable the Python Development Mode , or use a debug build to check errors. Return True if the string ends with the specified suffix , otherwise return False. suffix can also be a tuple of suffixes to look for. With optional start , test beginning at that position. With optional end , stop comparing at that position.

Return a copy of the string where all tab characters are replaced by one or more spaces, depending on the current column and the given tab size. Tab positions occur every tabsize characters default is 8, giving tab positions at columns 0, 8, 16 and so on. To expand the string, the current column is set to zero and the string is examined character by character.

The tab character itself is not copied. Any other character is copied unchanged and the current column is incremented by one regardless of how the character is represented when printed. Return the lowest index in the string where substring sub is found within the slice s[start:end]. Return -1 if sub is not found. The find method should be used only if you need to know the position of sub. To check if sub is a substring or not, use the in operator:.

Perform a string formatting operation. The string on which this method is called can contain literal text or replacement fields delimited by braces {}. Each replacement field contains either the numeric index of a positional argument, or the name of a keyword argument.

Returns a copy of the string where each replacement field is replaced with the string value of the corresponding argument. See Format String Syntax for a description of the various formatting options that can be specified in format strings.

When formatting a number int , float , complex , decimal. Decimal and subclasses with the n type ex: '{:n}'. This temporary change affects other threads. Similar to str. This is useful if for example mapping is a dict subclass:. Like find , but raise ValueError when the substring is not found. Return True if all characters in the string are alphanumeric and there is at least one character, False otherwise. A character c is alphanumeric if one of the following returns True : c. isalpha , c.

isdecimal , c. isdigit , or c. Return True if all characters in the string are alphabetic and there is at least one character, False otherwise. Return True if the string is empty or all characters in the string are ASCII, False otherwise. Return True if all characters in the string are decimal characters and there is at least one character, False otherwise. Decimal characters are those that can be used to form numbers in base 10, e.

Return True if all characters in the string are digits and there is at least one character, False otherwise. Digits include decimal characters and digits that need special handling, such as the compatibility superscript digits.

This covers digits which cannot be used to form numbers in base 10, like the Kharosthi numbers. Return True if the string is a valid identifier according to the language definition, section Identifiers and keywords. Call keyword. iskeyword to test whether string s is a reserved identifier, such as def and class. Return True if all cased characters 4 in the string are lowercase and there is at least one cased character, False otherwise.

Return True if all characters in the string are numeric characters, and there is at least one character, False otherwise. Numeric characters include digit characters, and all characters that have the Unicode numeric value property, e.

Return True if all characters in the string are printable or the string is empty, False otherwise. Note that printable characters in this context are those which should not be escaped when repr is invoked on a string. It has no bearing on the handling of strings written to sys. stdout or sys. Return True if there are only whitespace characters in the string and there is at least one character, False otherwise. Return True if the string is a titlecased string and there is at least one character, for example uppercase characters may only follow uncased characters and lowercase characters only cased ones.

Return False otherwise. Return True if all cased characters 4 in the string are uppercase and there is at least one cased character, False otherwise. Return a string which is the concatenation of the strings in iterable. A TypeError will be raised if there are any non-string values in iterable , including bytes objects.

The separator between elements is the string providing this method. Return the string left justified in a string of length width. Return a copy of the string with all the cased characters 4 converted to lowercase. Return a copy of the string with leading characters removed. The chars argument is a string specifying the set of characters to be removed. If omitted or None , the chars argument defaults to removing whitespace.

The chars argument is not a prefix; rather, all combinations of its values are stripped:. See str. removeprefix for a method that will remove a single prefix string rather than all of a set of characters. This static method returns a translation table usable for str.

If there is only one argument, it must be a dictionary mapping Unicode ordinals integers or characters strings of length 1 to Unicode ordinals, strings of arbitrary lengths or None. Character keys will then be converted to ordinals.

If there are two arguments, they must be strings of equal length, and in the resulting dictionary, each character in x will be mapped to the character at the same position in y. If there is a third argument, it must be a string, whose characters will be mapped to None in the result. Split the string at the first occurrence of sep , and return a 3-tuple containing the part before the separator, the separator itself, and the part after the separator.

If the separator is not found, return a 3-tuple containing the string itself, followed by two empty strings. If the string starts with the prefix string, return string[len prefix :]. Otherwise, return a copy of the original string:. If the string ends with the suffix string and that suffix is not empty, return string[:-len suffix ]. Return a copy of the string with all occurrences of substring old replaced by new.

If the optional argument count is given, only the first count occurrences are replaced. Return the highest index in the string where substring sub is found, such that sub is contained within s[start:end].

Return -1 on failure. Like rfind but raises ValueError when the substring sub is not found. Return the string right justified in a string of length width. Split the string at the last occurrence of sep , and return a 3-tuple containing the part before the separator, the separator itself, and the part after the separator. If the separator is not found, return a 3-tuple containing two empty strings, followed by the string itself.

Return a list of the words in the string, using sep as the delimiter string. If maxsplit is given, at most maxsplit splits are done, the rightmost ones. If sep is not specified or None , any whitespace string is a separator. Except for splitting from the right, rsplit behaves like split which is described in detail below. Return a copy of the string with trailing characters removed. The chars argument is not a suffix; rather, all combinations of its values are stripped:. removesuffix for a method that will remove a single suffix string rather than all of a set of characters.

If maxsplit is not specified or -1 , then there is no limit on the number of splits all possible splits are made. If sep is given, consecutive delimiters are not grouped together and are deemed to delimit empty strings for example, '1,,2'. split ',' returns ['1', '', '2']. Splitting an empty string with a specified separator returns ['']. If sep is not specified or is None , a different splitting algorithm is applied: runs of consecutive whitespace are regarded as a single separator, and the result will contain no empty strings at the start or end if the string has leading or trailing whitespace.

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Trade on the go. Anywhere, anytime. App Store. Android APK. Google Play. Need help? Typically, extension modules need to be compiled with the same compiler that was used to compile Python. For Python 2. NET MSVCCompiler will normally choose the right compiler, linker etc. on its own. This module provides the CygwinCCompiler class, a subclass of UnixCCompiler that handles the Cygwin port of the GNU C compiler to Windows.

It also contains the Mingw32CCompiler class which handles the mingw32 port of GCC same as cygwin in no-cygwin mode. Create an archive file eg. zip or tar. Returns the name of the archive file. compress must be 'gzip' the default , 'bzip2' , 'xz' , 'compress' , or None. For the 'compress' method the compression utility named by compress must be on the default program search path, so this is probably Unix-specific.

tar , possibly plus the appropriate compression extension. bz2 ,. xz or. Return the output filename. Uses either the zipfile Python module if available or the InfoZIP zip utility if installed and found on the default search path. If neither tool is available, raises DistutilsExecError. Returns the name of the output zip file. This module provides functions for performing simple, timestamp-based dependency of files and groups of files; also, functions based entirely on such timestamp dependency analysis.

Return false if both exist and target is the same age or newer than source. Raise DistutilsFileError if source does not exist. Walk two filename lists in parallel, testing if each source is newer than its corresponding target. Return a pair of lists sources , targets where source is newer than target, according to the semantics of newer. Return true if target is out-of-date with respect to any file listed in sources.

In other words, if target exists and is newer than every file in sources , return false; otherwise return true. missing controls what we do when a source file is missing; the default 'error' is to blow up with an OSError from inside os.

Create a directory and any missing ancestor directories. If the directory already exists or if name is the empty string, which means the current directory, which of course exists , then do nothing. Raise DistutilsFileError if unable to create some directory along the way eg. some sub-path exists, but is a file rather than a directory. If verbose is true, print a one-line summary of each mkdir to stdout.

Return the list of directories actually created. Copy an entire directory tree src to a new location dst. Both src and dst must be directory names. If src is not a directory, raise DistutilsFileError. If dst does not exist, it is created with mkpath. The end result of the copy is that every file in src is copied to dst , and directories under src are recursively copied to dst.

Return the list of files that were copied or might have been copied, using their output name. Files in src that begin with. nfs are skipped more information on these files is available in answer D2 of the NFS FAQ page. Recursively remove directory and all files and directories underneath it. Any errors are ignored apart from being reported to sys.

stdout if verbose is true. Copy file src to dst. If dst is a directory, then src is copied there with the same name; otherwise, it must be a filename. If the file exists, it will be ruthlessly clobbered.

If update is true, src will only be copied if dst does not exist, or if dst does exist but is older than src. link allows you to make hard links using os. link or symbolic links using os. symlink instead of copying: set it to 'hard' or 'sym' ; if it is None the default , files are copied. Move file src to dst.

If dst is a directory, the file will be moved into it with the same name; otherwise, src is just renamed to dst. Returns the new full name of the file. What about other systems? Create a file called filename and write contents a sequence of strings without line terminators to it.

Return a string that identifies the current platform. This is used mainly to distinguish platform-specific build directories and platform-specific built distributions. For non-POSIX platforms, currently just returns sys. For universal binary builds on macOS the architecture value reflects the universal binary status instead of the architecture of the current processor. For bit universal binaries the architecture is fat , for bit universal binaries the architecture is fat64 , and for 4-way universal binaries the architecture is universal.

Starting from Python 2. For AIX, Python 3. Python 3. aix bit build on AIX oslevel -s : Needed because filenames in the setup script are always supplied in Unix style, and have to be converted to the local convention before we can actually use them in the filesystem. Raises ValueError on non-Unix-ish systems if pathname either starts or ends with a slash. If pathname is relative, this is equivalent to os.

Currently this includes:. Note that this is not a full-fledged string interpolation function. No { } or style quoting is available. Split a string up according to Unix shell-like rules for quotes and backslashes. In short: words are delimited by spaces, as long as those spaces are not escaped by a backslash, or inside a quoted string.

Single and double quotes are equivalent, and the quote characters can be backslash-escaped. The backslash is stripped from any two-character escape sequence, leaving only the escaped character. The quote characters are stripped from any quoted string.

Returns a list of words. Perform some action that affects the outside world for instance, writing to the filesystem. True values are y , yes , t , true , on and 1 ; false values are n , no , f , false , off and 0. Raises ValueError if val is anything else. Byte-compile a collection of Python source files to. py are silently skipped. optimize must be one of the following:. pyc files according to PEP Return a version of header escaped for inclusion in an RFC header, by ensuring there are 8 spaces space after each newline.

Note that it does no other modification of the string. Provides exceptions used by the Distutils modules. bad command-line arguments. This module is safe to use in from This module provides a wrapper around the standard getopt module that provides the following additional features:.

Wrapper function. object is an object which will be used to store values see the getopt method of the FancyGetopt class. args is the argument list. Will use sys. argv[1:] if you pass None as args. All option tuples must have long options. The FancyGetopt class provides the following methods:. If args is None or not supplied, uses sys. If object is None or not supplied, creates a new OptionDummy instance, stores option values there, and returns a tuple args, object.

If object is supplied, it is modified in place and getopt just returns args ; in both cases, the returned args is a modified copy of the passed-in args list, which is left untouched. Generate help text a list of strings, one per suggested line of output from the option table for this FancyGetopt object. This module provides the FileList class, used for poking about the filesystem and building lists of files.

This module provides the spawn function, a front-end to various platform-specific functions for launching another program in a sub-process. Deprecated since version 3.

sysconfig has been merged into sysconfig. The specific configuration variables available depend heavily on the platform and configuration. The specific variables depend on the build process for the specific version of Python being run; the variables are those found in the Makefile and configuration header that are installed with Python on Unix systems. The configuration header is called pyconfig. h for Python versions starting with 2.

h for earlier versions of Python. Some additional functions are provided which perform some useful manipulations for other parts of the distutils package. The result of os. normpath sys. Return the value of a single variable. get name. Return a set of variable definitions. If there are no arguments, this returns a dictionary mapping names of configuration variables to values.

If arguments are provided, they should be strings, and the return value will be a sequence giving the associated values. If a given name does not have a corresponding value, None will be included for that variable. Return the full path name of the configuration header.

For Unix, this will be the header generated by the configure script; for other platforms the header will have been supplied directly by the Python source distribution. The file is a platform-specific text file. Return the full path name of the Makefile used to build Python. For Unix, this will be a file generated by the configure script; the meaning for other platforms will vary. The file is a platform-specific text file, if it exists. This function is only useful on POSIX platforms.

The following functions are deprecated together with this module and they have no direct replacement. Return the directory for either the general or platform-dependent C include files. Return the directory for either the general or platform-dependent library installation. The following function is only intended for use within the distutils package.

Do any platform-specific customization of a distutils. CCompiler instance. This function is only needed on Unix at this time, but should be called consistently to support forward-compatibility.

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Last Price. Return a dict containing preferred scheme names on the current platform. If j is omitted or None , use len s. Build your crypto portfolio. Since 2 hexadecimal digits correspond precisely to a single byte, hexadecimal numbers are a commonly used format for describing binary data. Parse a config. Some of these are not reported by the dir built-in function.

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