Python__模块

什么是模块：sys、time等模块，已经被封装起来，我们经常在用。
每个Python模块都有它的__name__

#!/usr/bin/python

if __name__ == '__main__':
    print 'This program is being run by itself'
else:
    print 'I am being imported from another module'

This program is being run by itself

说明运行着的模块名为'__main__'，也就是C语言中的main()

定义模块

#!/usr/bin/python
# Filename: mymodule.py
def sayHi():
    print 'Hi'

def sayHello():
    print 'Hello'

version = '0.1'

# End of mymodule.py

使用模块，导入全部

#!/usr/bin/python
import mymodule

mymodule.sayHi()
mymodule.sayHello()
print 'Version', mymodule.version

导入模块的指定部分

#!/usr/bin/python
from mymodule import sayHi, version