Python math module

Question

Whenever I try to use any of the built-in functions of Python s exponentiation and logarithms module  I get an error like this    NameError  name  sqrt  is not defined   I have tried using math sqrt 4  sqrt 4  and sqrt 4 0   but none of them work  The exception is pow  which works as it s supposed to  This is really strange and I m not sure what s wrong

User · Accepted Answer

pow is built into the language not part of the math library   The problem is that you haven t imported math    Try this   import math math sqrt 4

User · Answer

import math as m a int input  quot Enter the no quot    print m sqrt a    from math import sqrt print sqrt 25    from math import sqrt as s print s 25    from math import   print sqrt 25    All works

User · Answer

import math  imports math module  import math as m print m sqrt 25    from math import sqrt  imports a method from math module print sqrt 25    from math import sqrt as s print s 25    from math import   print sqrt 25

User · Answer

add   import math   at beginning  and then use   math sqrt num     or any other function you deem neccessary

User · Answer

In  from math import sqrt  Using sqrt 4  works perfectly well  You need to only use math sqrt 4  when you just use  import math

User · Answer

You can also import as  from math import     Then you can use any mathematical function without prefixing math  e g   sqrt 4

User · Answer

You need to say math sqrt when you use it   Or  do from math import sqrt   Hmm  I just read your question more thoroughly     How are you importing math   I just tried import math and then math sqrt which worked perfectly   Are you doing something like import math as m   If so  then you have to prefix the function with m  or whatever name you used after as    pow is working because there are two versions   an always available version in   builtin    and another version in math

[python] Python math module

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