python standard library pdf

%s called [%s]."% (func.__name__, arg)) return __deco return _decodef myfunc (): Print ("MyFunc () called.") def myfunc1 (): Print ("MyFunc () called.") MyFunc = Deco () (myfunc) myfunc1 = Deco ("Haha1") (MYFUNC1)Then look at the use of wraps in standard library functools, such as the official website example:From Functools import Wrapsdef my_decorator (f): @wraps (f) def wrapper (*args, **kwds): print ' ca

. Pyclbr:python Class Browsing Support208. Py_compile: Compiling python source files209. Compileall: Compiling python libraries by byteThe disassembler of Dis:python byte code.211. Pickletools: Serialization Development toolsOther212. Formatter: Universal formatted outputWindows-related213. Msilib: Read and write Windows Installer files214. Msvcrt:ms VC + + Runtime useful program215. Winreg:windows Registry

. Pyclbr:python Class Browsing Support208. Py_compile: Compiling python source files209. Compileall: Compiling python libraries by byteThe disassembler of Dis:python byte code.211. Pickletools: Serialization Development toolsOther212. Formatter: Universal formatted outputWindows-related213. Msilib: Read and write Windows Installer files214. Msvcrt:ms VC + + Runtime useful program215. Winreg:windows Registry

The content here is based on Linux process basics and Linux text streaming. The main function of the subprocess package is to execute external commands and programs. For example, I need to use wget to download files. I invoke the wget program in Python. In this sense, the subprocess function is similar to the shell. Subprocess and commonly used encapsulation functions When we run Python, we are creating a

Sqlite3 instance of Python standard library, pythonsqlite3 Python comes with a lightweight relational database SQLite. This database uses the SQL language. As a back-end database, SQLite can be used with Python to build websites or create tools with data storage needs. SQLit

Python standard library: built-in functions: ascii (object), pythonascii Like the repr () function, this function returns a printable string representation of an object. When a non-ASCII code is encountered, the \ x, \ u, \ U, and other characters are output. It is equivalent to repr () in Python 2. Example: # Asc

10.python Standard Library Overview10.1 Operating System interfaceThe OS module provides many functions that interact with the operating system (Operating system) Name of function How to use -GETCWD () Return to current working directory -chdir (PATH) Change the working directory -listdir (pat

;>> print ' entering function 'Entering function>>> Import Sys>>> print >> sys.stderr, ' entering function 'Entering functionThe shortcut syntax for the PRINT statement can be used to write to any open file (or class file object).Here, you can redirect a single print statement to stderr without affecting the subsequent print statements.Using the Sys module to exit a programCopy CodeThe code is as follows:Import SysSys.exit (1)Note that Sys.exit does not exit immediately. Instead, a Systemexit ex

A simple tutorial on drawing music scores using the wave module in the Python standard library, pythonwave In this article, we will explore a simple way to visualize your MP3 music favorites. The final result of this method will be a hexagonal grid map mapped to all your songs, where similar audio tracks will be adjacent. The colors in different regions correspon

Python implements multithreading primarily through the threading package in the standard library. In today's network era, each server receives a large number of requests. The server can handle these requests in a multi-threaded manner to improve the read and write efficiency of the network ports. Python is a Web server

This article mainly introduces the sqlite3 instance of the Python standard library. This article describes how to create a database, insert data, query data, update and delete data operation instances, for more information, see Python's built-in lightweight relational database SQLite. This database uses the SQL language. As a back-end database, SQLite can be used

Python standard library: built-in functions all (iterable) and pythoniterable If all the elements of an object that can be iterated are not empty (or empty iteration object), True is returned. This function is mainly used to determine whether objects such as lists, tuples, and dictionaries are empty elements. For example, a list with 10000 elements is provided. I

of the dictionary, and then search in the returned key list to determine whether a desired key appears.Using the TRY: statementA try statement establishes a situation in which a try statement can be followed by a except statement. Each except statement handles an error, which we call an exception. Use except first: Handle a type of error, such as getting a keyerror error while trying to check the refrigerator.There are multiple types of exceptions, each of which responds to the problem, and may

Today originally wanted to study under the multiprocessing standard library of inter-process communication, according to the multiprocessing website to the hint, there are two ways to achieve inter-process communication, pipe and queue respectively. Because watching the queue pleasing to the eye, just want to take the queue to achieve, later, was the pit .... So I have this article.I follow the

) # readfileandbuildobject Cpickle BagThe functionality and usage of the Cpickle package is almost identical to the pickle package (where the difference is actually rarely used), except that the Cpickle is written in C and is 1000 times times faster than the pickle package. For the above example, if you want to use the Cpickle package, we can change the import statement to:Import Cpickle as PickleThere is no need to make any more changes.SummarizeText-to-file with objectsPickle.dump (), P

The Python standard library, often referred to as the "own battery", naturally offers a wide range of functions, covering about 200 packages and modules. Continuous high-quality packages or modules have been developed, greatly enriching the standard library. However, some mo

Vamei Source: Http://www.cnblogs.com/vamei Welcome reprint, Please also keep this statement. Thank you!In the Loop object and function object, we understand the function of the circulator (iterator). A circulator is a container for objects that contain multiple objects. By invoking the next () method of the Circulator (__next__ () method, in Python 3.x), the Circulator returns an object in turn. Until all the objects are traversed, the circulator will

Python Standard library basehttpserver Chinese translation. Note: The basehttpserver module has been merged into Http.serverin Python3, and when you convert your resource to Python3, the 2to3 tool will automatically adapt the import. Source: lib/basehttpserver.pyThis module defines two classes for implementing an HTTP server (WEB servers). Typically

Python Standard library basehttpserver Chinese translation. Note: The basehttpserver module has been merged into Http.serverin Python3, and when you convert your resource to Python3, the 2to3 tool will self-adapt the import. Source code: lib/basehttpserver.pyThis module defines two classes for implementing an HTTP server (WEB servers). Typically, th

()) Save the above program as a py_id.py file, using $python py_id.py and $sudo python py_id.py to see the results of the operationSaved UID and saved GIDWhen we write a Python script, we actually run the Python interpreter instead of the Python script file.Run the executio