Python : name 'math' is not defined Error?

Question

I am a beginner in python and cant understand why this is happening:

from math import *
print \"enter the number\"
n=int(raw_input())
d=2
s=0
while d

        

Answer 1

You need to import math rather than from math import *.

Answer 2

Change

from math import *

to

import math

Using from X import * is generally not a good idea as it uncontrollably pollutes the global namespace and could present other difficulties.

Answer 3

You did a mistake..

When you wrote :

from math import *
# This imports all the functions and the classes from math
# log method is also imported.
# But there is nothing defined with name math

So, When you try using math.log

It gives you error, so :

replace math.log with log

Or

replace from math import * with import math

This should solve the problem.

Answer 4

How about (when you need only math.pi):

from math import pi as PI

and then use it like PI symbol?