A brief analysis of _name_= ' _main_ ' in Python

Just contact Python, the code in the _name_= ' _main_ ' more confused, this article on its explanation for reference to other blog (see Resources), I hope and everyone together to learn.

Make a script both importable and executable

First, let's look at an example.

1 # module.py 2 def Main (): 3   Print " we is in%s "%__name__4if__name__'__main__ ' : 5   Main ()

In this function, the main function is defined, and when the py file is executed, the We is in __main__ is printed, indicating that the contents of the IF statement are executed. However, when you import a module module from another module and call Main ()

1 # anothermodule.py 2  from Import Main 3 Main ()

Will print the results we are in module

The number is different from the previous display, stating that there is no code to enter if

where __name__ is the built-in property of the module, and the value of this built-in property depends on how the. py file is used, whether it is imported as a module or executed directly.
If you are directly executing, then the value of this __name__ is __main__, if you import as a module, then this built-in property value depends on the file name, here is the module.

Resources

1.http://blog.csdn.net/sinat_15274667/article/details/51378882

2.http://www.jb51.net/article/51892.htm

A brief analysis of _name_= ' _main_ ' in Python