Two practical tips for beginners in Python

In this paper, we record the two useful techniques used in the beginner Python, and share them for your reference. Specific 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 Total ...>>> powersum (2, 3, 4) 25>>> powersum (2, 10) 100

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

The 2.exec statement executes the string str as valid Python code. the 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!

Hopefully this article will help you with Python programming.

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