python中math.pi()是什么意思?

Question

python中math.pi()是什么意思

Answer 1

就是圆周率数值
用于数学计算
死记硬背个圆周率 不是程序员的作风~
以下是用法
>>> import math
>>> math.pi
3.141592653589793
>>>

Answer 2

Python 2.7.2+ (default, Oct 4 2011, 20:03:08)
[GCC 4.6.1] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import math
>>> math.pi()
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: 'float' object is not callable
>>> math.pi
3.141592653589793
>>>