Call a function from another file

Question

Set up  I have a  py file for each function I need to use in a program   In this program  I need to call the function from the external files   I ve tried   from file py import function a b    But I get the error      ImportError  No module named  file py   file is not a package   How do I fix this problem

User · Answer

Functions from  py file  can  of course  be in different directory  can be simply imported by writing directories first and then the file name without  py extension   from directory name file name import function name   And later be used  function name

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You should have the file at the same location as that of the Python files you are trying to import  Also  from file import function  is enough

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append a dot    in front of a file name if you want to import this file which is in the same directory where you are running your code   For example  i m running a file named a py and i want to import a method named addFun which is written in b py  and b py is there in the same directory  from  b import addFun

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If your file is in the different package structure and you want to call it from a different package  then you can call it in that fashion   Let s say you have following package structure in your python project     in - com my func DifferentFunction python file you have some function  like   def add arg1  arg2       return arg1   arg2  def sub arg1  arg2        return arg1 - arg2  def mul arg1  arg2        return arg1   arg2   And you want to call different functions from Example3 py  then following way you can do it   Define import statement in Example3 py - file for import all function  from com my func DifferentFunction import     or define each function name which you want to import  from com my func DifferentFunction import add  sub  mul   Then in Example3 py you can call function for execute   num1   20 num2   10  print   n add      add num1 num2   print   n sub      sub num1 num2   print   n mul      mul num1 num2     Output    add    30   sub    10   mul    200

User · Answer

First of all you do not need a  py   If you have a file a py and inside you have some functions   def b        Something   return 1  def c        Something   return 2   And you want to import them in z py you have to write  from a import b  c

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in my case i named my file helper scrap py and couldn t make it work until i changed to helper py

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You can call the function from a different directory as well  in case you cannot or do not want to have the function in the same directory you are working  You can do this in two ways  perhaps there are more alternatives  but these are the ones that have worked for me    Alternative 1 Temporarily change your working directory  import os  os chdir    Put here the directory where you have the file with your function      from file import function  os chdir    Put here the directory where you were working       Alternative 2 Add the directory where you have your function to sys path  import sys  sys path append    Put here the directory where you have the file with your function      from file import function

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You don t have to add file py   Just keep the file in the same location with the file from where you want to import it  Then just import your functions   from file import a  b

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First save the file in  py format  for example  my example py   And if that file have functions   def xyz             --------          --------  def abc             --------          --------   In the calling function you just have to type the below lines   file name  my example2 py                                import my example py   a   my example xyz    b   my example abc

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Came across the same feature but I had to do the below to make it work    If you are seeing  ModuleNotFoundError  No module named   you probably need the dot    in front of the filename as below      from  file import funtion

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in my main script detectiveROB py file i need call passGen function which generate password hash and that functions is under modules passwordGen py The quickest and easiest solution for me is Below is my directory structure  So in detectiveROB py i have import my function with below syntax from modules passwordGen import passGen

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Any of the above solutions didn t work for me  I got ModuleNotFoundError  No module named whtever error  So my solution was importing like below from   import filename   without  py    inside my first file I have defined function fun like below   file name is firstFile py def fun      print  this is fun    inside the second file lets say I want to call the function fun from   import firstFile  def secondFunc       firstFile fun     calling  fun  from the first file  secondFunc     calling the function  secondFunc

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You can do this in 2 ways  First is just to import the specific function you want from file py  To do this use  from file import function   Another way is to import the entire file  import file as fl   Then you can call any function inside file py using  fl function a b

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Inside MathMethod Py   def Add a b      return a b   def subtract a b     return a-b   Inside Main Py  import MathMethod as MM    print MM Add 200 1000     Output 1200

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Rename the module to something other than  file    Then also be sure when you are calling the function that   1 if you are importing the entire module  you reiterate the module name when calling it   import module module function name     or  import pizza pizza pizza function     2 or if you are importing specific functions  functions with an alias  or all functions using    you don t reiterate the module name   from pizza import pizza function pizza function     or  from pizza import pizza function as pf pf     or  from pizza import   pizza function

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Suppose the file you want to call is anotherfile py and the method you want to call is method1  then first import the file and then the method  from anotherfile import method1   if method1 is part of a class  let the class be class1  then   from anotherfile import class1   then create an object of class1  suppose the object name is ob1  then  ob1   class1   ob1 method1

User · Answer

There isn t any need to add file py while importing  Just write from file import function  and then call the function using function a  b   The reason why this may not work  is because file is one of Python s core modules  so I suggest you change the name of your file   Note that if you re trying to import functions from a py to a file called b py  you will need to make sure that a py and b py are in the same directory

[python] Call a function from another file?

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