About the module in Python

The module in Python, the concept and the use of the following main points to note:

(1)when import xx, the code in this XX module will be executed once (and executed only once):

For example:

(2) module package :

(3) importing can import objects from other modules (objects include: functions, global variables)

Import module_name     #module_name. Foo () to call module_name in the Foo function  import package_name    #如果package_name中__ init__.py file to import the specific module module_name, then you can use the Package_name.module_name function in Module_name, otherwise it is not the  import Package_ Name.module_name  #package_name. Module_name.foo ()  represents the use of the Foo function in Module_name from the  package_name import Module_name  #module_name. Foo ()  means the Foo function using module_name from  package_name.module_name import foo        # Direct use of Foo () is fine.  

Remark:import Module_name.foo is illegal

Reference Link: http://blog.csdn.net/wangjianno2/article/details/47375439

About the module in Python