How to use variables from another file in python? [duplicate]

Question

I have created two files. The first one called EA contains variables and calls to functions. The second file called EA_Functions contains all the functions used in EA.

This is EA:

from EA_Functions import *

HIGHEST_NUMBER = 10
LOWEST_NUMBER = 1
SET_SIZE = 5
NUMBER_OF_PARENTS = 2
NUMBER_OF_CHILDREN = 2
MUTATION_STEP_SIZE = 0.5

warms = {}

# Create an initial random sets of warms
for i in range(SET_SIZE):
    warms[i] = np.random.randint(low=LOWEST_NUMBER, high=HIGHEST_NUMBER + 1, size=SET_SIZE, dtype=int)

# Order the set of warms based on the error
warms_sorted = sort(warms)

This is EA_Functions:

import numpy as np
from random import randint


def calculate_error(lst):
    return (SET_SIZE - np.mean(lst)) ** 2


def sort(dictionary):
    return sorted(dictionary.items(), key=lambda item: calculate_error(item[1]))

I want to use SET_SIZE variable contained in the first file, EA.

If in EA_Functions I try to import EA:

from EA import *

I get errors during the execution of the "main" code, the file EA

Why do you need to have it on EA? If you are not going to change it's value via code, you can have it on EA_Functions and the code will do fine — Ciro García
– Ciro García, Commented Jun 26, 2020 at 0:36
always put full error message (starting at word "Traceback") in question (not comment) as text (not screenshot). There are other useful information. — furas
– furas, Commented Jun 26, 2020 at 1:03

Sameh Ashraf · Accepted Answer · 2020-06-26 00:32:58Z

0

you can add a parameter in the function like this:

def calculate_error(lst, size):
    return (size - np.mean(lst)) ** 2

then, when you call it pass SET_SIZE to calculate_error()

answered Jun 26, 2020 at 0:32

Sameh Ashraf

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1 Comment

Daniel Zito Over a year ago

Very smart! Thank you ;) I didn't think about that.

zganger · Accepted Answer · 2020-06-26 00:33:55Z

0

You are getting errors because you have a circular import. If you are from EA_Functions.py in EA.py, you shouldn't import from EA.py in EA_Functions.py.

answered Jun 26, 2020 at 0:33

zganger

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