Python学习笔记1—模块

模块的使用

引用模块的两种形式

• 形式一： import module_name
• 形式二： from module1 import module11   (module11是module的子模块）

例：引用精确除法模块

>>> 5/2
2
>>> from __future__ import division
>>> 5/2
2.5
>>> 5//2
2
>>> 

如过需要进行开方，乘方，对数等运算就需要用到Python中的Math模块

>>> import math
>>> dir(math) 　　 #查看该模块提供的功能
['__doc__', '__file__', '__name__', '__package__', 'acos', 'acosh', 'asin', 'asinh', 'atan', 'atan2', 'atanh', 'ceil', 'copysign', 'cos', 'cosh', 'degrees', 'e', 'erf', 'erfc', 'exp', 'expm1', 'fabs', 'factorial', 'floor', 'fmod', 'frexp', 'fsum', 'gamma', 'hypot', 'isinf', 'isnan', 'ldexp', 'lgamma', 'log', 'log10', 'log1p', 'modf', 'pi', 'pow', 'radians', 'sin', 'sinh', 'sqrt', 'tan', 'tanh', 'trunc']
>>> help(math.pow)   #查看函数的使用方法
Help on built-in function pow in module math:

pow(...)
    pow(x, y)

    Return x**y (x to the power of y).
(END) 

有时候引入的模块或者方法名称有点长，可以给它重命名。如：

from pprint import pprint as pt

Python 的模块，不仅可以看帮助信息和文档，还能够查看源码，因为它是开放的。

>>> print pprint.__file__
/usr/local/python2.7/lib/python2.7/pprint.pyc

在同级目录下就可以看到源码

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pprint

让 dict 格式化输出

>>> import pprint
>>> pprint.pprint(a)
{'book': 'www.itdiffer.com',
 'goal': 'from beginner to master',
 'lang': 'Python',
 'teacher': 'qiwsir'}

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