Python类

>>> class MyClass:...     """A simple example class"""...     i = 12345...     def f(self):...         return 'hello world'... >>> MyClass.__doc__'A simple example class'>>> MyClass.i12345>>> h = MyClass()>>> h.f()'hello world'

操作操作系统

>>> import os>>> os.getcwd()'/home/jiqing'>>> os.system('mkdir today');0>>> os.chdir('/home/wwwroot/default')>>> os.getcwd()'/home/wwwroot/default'

常用数学计算

>>> import math>>> math.log(1024,2);10.0>>> import random>>> random.choice(['apple','pear','banana'])'banana'>>> random.random()0.8585164844368266>>> random.random()0.1898083053044728