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<n :     if n%d==0:        x=math.log(d)        s=s+x        print d     d=d+1 print s,n,float(n)/s    

Running it in Python and inputing a non prime gives the error

Traceback (most recent call last):   File "C:\Python27\mit ocw\pset1a.py", line 28, in <module>     x=math.log(d) NameError: name 'math' is not defined 

Answer 1

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 2

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.