Two _python of the beginner Python practical skills

This article has recorded the beginner Python commonly used two practical techniques, shares for everybody to use for reference. Specifically as follows:

1. Variable parameters

The sample code is as follows:

>>> def powersum (Power, *args): 
...   ' Return the sum of each argument raised to specified power. ' 
...   Total = 0 ...   For i in args: ...     Total + = POW (i, power) ...   Return to total 
...
>>> Powersum (2, 3, 4)
>>> powersum (2) 
100

Because there is a * prefix before the args variable, all the extra function arguments are stored as a tuple in the args. If a * * prefix is used, the extra argument is considered a dictionary key/value pair.

the 2.EXEC statement executes string str as a valid Python code. execfile (filename [, globals [, locals]]) function can be used to execute a file.

The sample code is as follows:

>>> exec ' Print Hello world ' 
Hello world>>> execfile (r ' c:\test.py ') 
hello,world!

I hope this article will help you with your Python programming.