5. Data Structures — Python 3.9.5 documentation

5. Data Structures — Python 3.9.5 documentation

If no index is specified, a.pop() removes and returns the last item in the list. (The square ... If the expression is a tuple (e.g. the (x, y) in the previous example), it must be parenthesized. >>> >>> vec = [-4, -2, 0 ...

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3. Data model — Python 3.9.5 documentation

It is used to signify the absence of a value in many situations, e.g., it is ... uses the C3 method resolution order which behaves correctly even in the presence of ...

dataclasses — Data Classes — Python 3.9.5 documentation

The decorator returns the same class that it is called on; no new class is created. ... If eq and frozen are both true, by default dataclass() will generate a ... @ dataclass class C: mylist: list[int] = field(default_factory=list) c = C()...

Installing Python Modules — Python 3.9.5 documentation

Starting with Python 3.4, it defaults to installing pip into all created virtual ... For Windows users, the examples in this guide assume that the option to adjust the ...

tkinter — Python interface to Tcl/Tk — Python 3.9.5 documentation

The man3 man pages describe the C interface to the Tk library and thus are not especially helpful for script writers. Addison-Wesley publishes a book called Tcl ...

pdb — The Python Debugger — Python 3.9.5 documentation

It also supports post-mortem debugging and can be called under program control . The debugger is extensible – it is actually defined as the class Pdb . This is ...

Download — Python 3.9.5 documentation

To download an archive containing all the documents for this version of Python in one of various formats, follow ... PDF (US-Letter paper size), Download (ca.

Streams — Python 3.9.5 documentation

coroutine asyncio. open_connection (host=None, port=None, *, loop=None, limit =None, ssl=None, family=0, proto=0, flags=0, sock=None, local_addr=None, ...

Glossary — Python 3.9.5 documentation

It looks like a coroutine function defined with async def except that it contains ... the last-modified time of the corresponding source file to determine its validity.

Changelog — Python 3.9.5 documentation

bpo-40432: Updated pegen regeneration script on Windows to find and use Python 3.8 or higher. Prior to this, pegen ... bpo-40287: Fixed SpooledTemporaryFile.seek() to return the position. ... bpo-39432: Implement PEP-489 algorithm for no...

6. Expressions — Python 3.9.5 documentation

Subsequent for clauses and any filter condition in the leftmost for clause cannot ... If a comprehension contains either async for clauses or await expressions it is ... ( To summarize, the key type should be hashable, which excludes all m...

Sorting HOW TO — Python 3.9.5 documentation

The value of the key parameter should be a function (or other callable) that takes a single argument and returns a key to use for sorting purposes. This technique ...

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8. Errors and Exceptions — Python 3.9.5 documentation

This is true for all built-in exceptions, but need not be true for user-defined ... It can also be used to print an error message and then re-raise the exception ...

2. Lexical analysis — Python 3.9.5 documentation

Python reads program text as Unicode code points; the encoding of a source file ... documentation for the gettext module for more information on this convention.

7. Simple statements — Python 3.9.5 documentation

If the target list contains one target prefixed with an asterisk, called a “starred” target: ... If the name does not occur in a global or nonlocal statement in the current ...

Built-in Types — Python 3.9.5 documentation

(2). divmod(). pow(x, y). x to the power y. (5) ... reverse is a boolean value. If set to True , then the list elements are sorted as if each comparison were reversed.

Built-in Functions — Python 3.9.5 documentation

The argument may be an integer, a floating point number, or an object ... As repr() , return a string containing a printable representation of an object, but escape ... one of True or False . x is converted using the standard truth testin...

8. Compound statements — Python 3.9.5 documentation

The if statement is used for conditional execution: if_stmt ::= "if" ... or evaluated). If all expressions are false, the suite of the else clause, if present, is executed.

File and Directory Access — Python 3.9.5 documentation

File and Directory Access¶. The modules described in this chapter deal with disk files and directories. For example, there are modules for reading the properties ...

math — Mathematical functions — Python 3.9.5 documentation

Return the base-10 logarithm of x. This is usually more accurate than log(x, 10) . math. pow ...

zipfile — Work with ZIP archives — Python 3.9.5 documentation

The error raised for bad ZIP files. ... For example, if our test files are all either in test directories or start with the string test_ , we can use a filterfunc to exclude ...

abc — Abstract Base Classes — Python 3.9.5 documentation

Classes created with a metaclass of ABCMeta have the following method: register (subclass)¶. Register subclass as a “virtual subclass” of this ABC. For example ...

10. Brief Tour of the Standard Library — Python 3.9.5 documentation

The math module gives access to the underlying C library functions for ... While date and time arithmetic is supported, the focus of the implementation is on ...

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ftplib — FTP protocol client — Python 3.9.5 documentation

Return a list of file names as returned by the NLST command. The optional argument is a directory to list (default is the current server directory). Multiple arguments ...

imaplib — IMAP4 protocol client — Python 3.9.5 documentation

... all be found at (Source Code) https://github.com/uw-imap/imap (Not Maintained ). ... Raises an auditing event imaplib.open with arguments self , host , port .

unittest — Unit testing framework — Python 3.9.5 documentation

A test case is the individual unit of testing. It checks for a specific response to a particular set of inputs. unittest provides a base class, TestCase , which ...

smtplib — SMTP protocol client — Python 3.9.5 documentation

For normal use, you should only require the initialization/connect, sendmail() , and SMTP.quit() methods. An example is included below. The SMTP class ...

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syslog — Unix syslog library routines — Python 3.9.5 documentation

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gzip — Support for gzip files — Python 3.9.5 documentation

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