Importing a function from a class in another file

Question

I m writing a Python program for fun but got stuck trying to import a function from a class in another file  Here is my code    jurassic park mainframe  from random import randint from sys import exit from comm system import Comm system  the file i want to import from    class Jpark mainframe object       def mainframe home self           print       Welcome to the Jurassic Park Mainframe               print            Security Administration                         print             Communications Systems                         print                 System Settings                            print                     Quit                                    prompt   raw input  What would you like to do              while prompt     Quit                if prompt     Security Administration                   print  Please enter the 5-digit passcode                   security passcode     d d d d d     2  0  1  2  randint 1  2                   security guess   raw input                       security guesses   0                  while security guess    security passcode and security guesses  lt  7                      print  Incorrect  Please enter the security passcode                       security guesses    1                     security guess   raw input                            if security guess    security passcode                          print           Security Administration                                 print  Area 1 Fences  Off                          print  Area 2 Fences  On                          print  Area 3 Fences  Off                          print  Velociraptor Compound  Off                          print  Lobby Security System  Off                          print  Entrance Facility System  Off                          print  To enable all systems  enter  On                             enable security   raw input                                if enable security     On                               print  Systems Online                 if prompt     System Settings                   print  You do not have access to system settings                   exit 0                if prompt     Communications Systems                   print             Communications Systems                             print  error   comm link  missing in directories                  exit 0              return Comm system run  this is where I want to return the                                                      the other file  the game   jpark mainframe   the game mainframe home     I want to return a function called run   from a class in another file  When I import the file  it first runs the class with run   in it  then proceeds to run the original code  Why does this happen    Here is the code from comm system    communication systems   from sys import exit  class Comm system object   def run self        comm directory     net link    tsfa run    j link       print  When the system rebooted  some files necessary for      print  communicating with the mainland got lost in the directory       print  The files were poorly labeled as a result of sloppy      print  programming on the staff s part  You must locate the      print  the file and contact the rescue team before the dinosaurs      print  surround the visitor s center  You were also notified the      print  generators were shorting out  and the mainframe will lose      print  power at any moment  Which directory will you search in       print  you don t have much time  Option 1  cd  comm sys file      print  Option 2  cd  comm sys dis      print  Option 3  cd  comm sys comm       dir choice   raw input  jpark edwin          if dir choice      comm sys file  or dir choice      comm sys dis           print  misc txt           print  You couldn t locate the file           print  The system lost power and your computer shut down on you           print  You will not be able to reach the mainland until the system          print  comes back online  and it will be too late by then           return  death       if dir choice      comm sys comm           comm directory append  comm link           print comm directory         print  You found the right file and activated it           print  Just in time too  because the computers shut down on you           print  The phonelines are radios are still online           print  You and the other survivors quickly call the mainlane          print  and help is on the way  You all run to the roof and wait          print  until the helocopter picks you up  You win   a game   Comm system   a game run

User · Accepted Answer

from otherfile import TheClass theclass   TheClass     if you want to return the output of run return theclass run       if you want to return run itself to be used later return theclass run   Change the end of comm system to   if   name         main         a game   Comm system       a game run     It s those lines being always run that are causing it to be run when imported as well as when executed

User · Answer

from FOLDER NAME import FILENAME from FILENAME import CLASS NAME FUNCTION NAME   FILENAME is w o the suffix

User · Answer

If  like me  you want to make a function pack or something that people can download then it s very simple  Just write your function in a python file and save it as the name you want IN YOUR PYTHON DIRECTORY  Now  in your script where you want to use this  you type   from FILE NAME import FUNCTION NAME   Note - the parts in capital letters are where you type the file name and function name   Now you just use your function however it was meant to be   Example   FUNCTION SCRIPT - saved at C  Python27 as function choose py  def choose a     from random import randint   b   randint 0  len a  - 1    c   a b    return c    SCRIPT USING FUNCTION - saved wherever  from function choose import choose list a     dog    cat    chicken   print choose list a     OUTPUT WILL BE DOG  CAT  OR CHICKEN  Hoped this helped  now you can create function packs for download   --------------------------------This is for Python 2 7-------------------------------------

User · Answer

First you need to make sure if both of your files are in the same working directory  Next  you can import the whole file  For example   import myClass   or you can import the entire class and entire functions from the file  For example   from myClass import   Finally  you need to create an instance of the class from the original file and call the instance objects

User · Answer

It would really help if you d include the code that s not working  from the  other  file   but I suspect you could do what you want with a healthy dose of the  eval  function   For example   def run        print  this does nothing   def chooser        return  run   def main           works just like      run          eval chooser        The chooser returns the name of the function to execute  eval then turns a string into actual code to be executed in-place  and the parentheses finish off the function call

User · Answer

You can use the below syntax -   from FolderName FileName import Classname

[python] Importing a function from a class in another file?

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