Python package and module instance, Python module instance

Python package and module instance, Python module instance

I. instances and results

1) instance structure and specific files:

Copy codeThe Code is as follows:
PyPackage
│ PyCommonM. py
│ _ Init _. py
│
─ ── P1Package
│ P1M. py
│ P1MC. py
│ _ Init _. py
│
2017-p2
P2.py
P2M. py

2) PyCommonM. py

Copy codeThe Code is as follows:
Def PyCommonMF (): print "PyCommonMF"

3) P1M. py:

Copy codeThe Code is as follows:
Def P1MF (): print 'p1mf'

4) P1MC. py:

Copy codeThe Code is as follows:
Class P1MC ():
@ Staticmethod
Def p1olap (): print 'p1w'

5) P2M. py:

Copy codeThe Code is as follows:
Def P2MF (): print 'p2mf'

6) P2.py:

Copy codeThe Code is as follows:
Import P2M
From PyPackage import PyCommonM
From PyPackage. p1Package import P1M
From PyPackage. p1Package. P1MC import P1MC

Def P2F ():
Print 'p2f'

If _ name _ = '_ main __':
P2F ()
P2M. P2MF ()
P1M. P1MF ()
P1MC. p1olap ()
PyCommonM. PyCommonMF ()

7) Running p2.py:

Copy codeThe Code is as follows:
P2F
P2MF
P1MF
P1olap
PyCommonMF

Ii. Explanation

* A py file is a module, such as module: PyCommonM. py, P2M. py, P1MC. py, and P1M. py.
* The folder containing _ init _. py is a package, for example, package: PyPackage and p1Package.
* You can directly use import to reference other modules in the same directory, for example, import P2M in p2.py.
* Use from import to reference the modules belonging to a certain package in other directories, for example, from PyPackage import PyCommonM and from PyPackage. p1Package import P1M in py. py.
* Use from import to reference classes in a module, for example, from PyPackage. p1Package. P1MC import P1MC.

Note that the directory where the package is located must be in the pythonpath environment variable.