CODEWITHSUNDEEP
python-3.x
Venkat Kishore
Venkat Kishore

Reputation: 67

How to import variable from another file in python

I have a variable "OTPN" in an otp_fun file and I want to import that variable to the Main file, I tried by importing "From otp_fun import otpn", But it is throwing an error

otp_fun file code   

def otp():
    new = int(random.random()*1000000)
    global otpn
    otpn = round(new,6)



main file code

from Contacts.otp_fun import otp,otpn

it has to import otpn variable but it is throwing an error saying " ImportError: cannot import name 'otpn' from 'Contacts.otp_fun"

Upvotes: 1

Views: 268

Answers (2)

palvarez
palvarez

Reputation: 1598

You cannot import otpn because it has not been defined, you see it is defined in otp, but this variable will only be made available after calling it.

You may think a solution would be to define otpn in global scope with a default value like this:

otp_fun file code 

otpn = None

def otp():
    new = int(random.random()*1000000)
    global otpn
    otpn = round(new,6)

But if you import it using from Contacts.otp_fun import otpn and then call otp you will see the value does not change :(

main file code

from otp_fun import otpn, otp

print(otpn)
# prints None

otp()

print(otpn)
# prints None

To keep the value linked you want to import the whole module with import Contacts.otp_fun.

main file code

import otp_fun

print(otp_fun.otpn)
# prints None

otp_fun.otp()
# changes otpn value

print(otp_fun.otpn)
# prints some random number

Upvotes: 1

LinPy
LinPy

Reputation: 18578

you can use Class:

otp_fun file code :

import random


class Otp():
    def otp(self):
        new = int(random.random() * 1000000)
        global otpn
        otpn = round(new, 6)
        return otpn

main file code:

from Contacts.otp_fun import Otp

myVariable = Otp()

print(myVariable.otp())

Upvotes: 0

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