Python Foundation-python most important, library/module

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I. Introduction of the Module

1. Concept

• a code set consisting of N. py files is called a module for the implementation of complex functions

• The module is a file

• Dir(module name): You can see how the module is used

2. Classification

• custom modules, built-in modules, third-party modules (http://pypi.python.org)

3. Import the module

• The import module is actually telling The Python interpreter interprets the py file,imports the module name into a py file, the interpreter interprets the py file or imports a package, and the interpreter interprets the __ in the package. init__.py file.

1) from module name . Xx.xximport XX

2) from module name . xx.xximport xx as alias

3) from module name . Xx.xximport *

4. Installation process of open source module

1) Download the source code

2) unzip the source code

3) Enter the catalogue

4) Compile the source python setup.py build(This command is not normally required now)

5) Install the source python setup.py install

Os module: Used to provide system-level operations

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III. SYS module: Provides an interpreter-related operation

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Four, Shutil module: Advanced Processing file Module

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V. python2.+ compression using zipfile and tarfile modules

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VI. Random module: Used to generate stochastic numbers

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Vii. MD5 and hashlib cryptographic modules: can be used to generate ciphertext for strings

1. MD5(3.X version integrated into the hashlib )

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• As can be seen here,MD5 can be plaintext encryption, can be used for password authentication, for example, the user's real password is saved with passwd defined as 123456, and then the user log onwhen the user login password use password definition, if the password entered is correct, the last comparison of two ciphertext is the same.

2. Hashlib module: Support more encryption than MD5

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They are used in a similar way

Eight, re modules: support Regular Expressions

1. Match,search,findall

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2. When matching a large number of rows, use this method

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3. use of Sub,split,FindAll

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4. Regular expressions

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5. Shelve module:python A simple storage data solution

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Ten, Time module: shows the elapsed times from that to present, which can be used to calculate elapsed time or display the current time

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Python Foundation-python most important, library/module