Python: Importing classes runs the code in __init__()

Question

I have a main class creating an instance of another class, which has to be imported first. After debugging a while I found out, that the code within the __init__ method of the imported class runs when I import it. However, for my code to properly work I need it to not be run when imported. I already found this thread , but it doesn't really help me. For testing I wrote a simple application where the problem doesn't appear:

test.py:

class foo:
    def __init__(self):
        print("foo")

main.py:

from test import foo
def main():
    print("bar")
    t = foo()

The code works as expected, the out put is first "bar", then "foo".

When is the __init__ code executed and when not?

Answer 1

__init__() of your foo class is executed when you call foo()

So in your case the constructor call will occure when you do t = foo()