1.help（）进入帮助文档
1 >>> help() 2 3 Welcome to Python 3.5's help utility! 4 5 If this is your first time using Python, you should definitely check out 6 the tutorial on the Internet at http://docs.python.org/3.5/tutorial/.
2.查看所有模块
1 help> modules 2 3 Please wait a moment while I gather a list of all available modules... 4 5 AutoComplete _pyio filecmp pyscreeze 6 AutoCompleteWindow _random fileinput pytweening 7 ...... 8 9 Enter any module name to get more help. Or, type "modules spam" to search 10 for modules whose name or summary contain the string "spam".
3.导入模块后，查看模块使用方法
1 >>> import math 2 >>> help(math) 3 Help on built-in module math: 4 5 NAME 6 math 7 8 DESCRIPTION 9 This module is always available. It provides access to the 10 mathematical functions defined by the C standard. 11 12 FUNCTIONS 13 acos(...) 14 acos(x) 15 16 Return the arc cosine (measured in radians) of x. 17 ...
4.查看模块下所有函数名称，前提要import
1 >>> dir(math) 2 ['__doc__', '__loader__', '__name__',...] 3 >>>
5.查看模块下的函数用法
1 >>> help(math.sin) 2 Help on built-in function sin in module math: 3 4 sin(...) 5 sin(x) 6 7 Return the sine of x (measured in radians).