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初学Python实用技巧两则

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Release: 2016-06-16 08:42:21
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本文记录了初学Python常用的两则实用技巧,分享给大家供大家参考之用。具体如下:

1.可变参数

示例代码如下:

>>> 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

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由于在args变量前有*前缀,所有多余的函数参数都会作为一个元组存储在args中。如果使用的是**前缀,多余的参数则会被认为是一个字典的键/值对。

2.exec语句将字符串str当成有效Python代码来执行。execfile(filename [,globals [,locals ]])函数可以用来执行一个文件。

示例代码如下:

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

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希望本文所述对大家的Python程序设计有所帮助。

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