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I want to obtain the value of pi in Python 2.7, but it appears as if Python doesn't acknowledge math.pi. I am working with IDLE, and when I try to display the value of math.pi with the help of the print statement, it says that "Math is not defined" or "math is not defined".

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You need to first import the math package then you can able to use the .pi:

Python 2.7.5 (default, May 15 2013, 22:44:16) [MSC v.1500 64 bit (AMD64)] on win32

Type "help", "copyright", "credits" or "license" for more information.

>>> import math

>>> math.pi


Python also comes with batteries incorporated, of course:

>>> math.radians(90)


>>> math.radians(180)


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