三小时快速入门Python终结篇--其他模块导入

其他模块导入

1、数学模块math

# 可以直接引用其它模块
import math
print(math.sqrt(16))  # => 4
# 也可以引用模块中的函数
from math import ceil, floor
print(ceil(3.7))  # => 4.0
print(floor(3.7))   # => 3.0

# 你可以引用一个模块中的所有函数
# 警告：这是不推荐的
from math import *
# 可以给模块起个简短的别名
import math as m
math.sqrt(16) == m.sqrt(16)   # => True
# you can also test that the functions are equivalent
from math import sqrt
math.sqrt == m.sqrt == sqrt  # => True
# Python modules are just ordinary python files. You
# can write your own, and import them. The name of the
# module is the same as the name of the file.
# You can find out which functions and attributes
# defines a module.
import math
dir(math)

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