CODEWITHSUNDEEP
pythonimportreload
Amr Ghaly
Amr Ghaly

Reputation: 21

reloading a changed module in python have a delay?

I have a function that changes the module based on a passed function then import that module to use it. but when I change the module once then import it, it's as intended then I changed it again with no time delay the imported module is just it was in the first change

this is the function that creates the module

import sys
from time import sleep
def get_fun(text_fun):
    with open('plotFun.py', 'w') as plotFun:
        plotFun.write(f'class FunctionObject():\n\tdef function_object(self, x=None):\n\t\ty = {text_fun}\n\t\treturn "{{:.2f}}".format(y)')

    # import the created class
    if 'plotFun' not in sys.modules:
        from plotFun import FunctionObject
    else:
        del sys.modules["plotFun"]
        from plotFun import FunctionObject
    
    # create an instance of the created class
    my_fun =  FunctionObject()
    
    # check if the function inputted from user is a valid function
    try:
        my_fun.function_object(3.14)
    except NameError:
        raise ValueError('Invalid Function')
    # pass any other errors, they will be found later when the function is used.
    except:
        pass

    return my_fun

def main():
    y1 = get_fun('2*3')
    print(y1.function_object())
    sleep(1)
    y2 = get_fun('3*3')
    print(y2.function_object())

main()

with this code the print is 6.00 9.00 but if I removed sleep(1) both print are 6.00 I tried sleep(0.1) but still both are 6.00 but when I tried sleep(0.7) it changed. it's like I have to delay for a specific time for the function to change

Upvotes: 2

Views: 215

Answers (1)

Davis Herring
Davis Herring

Reputation: 40033

Python reuses the byte-compiled version of your module if the source appears to be unmodified. The default mechanism is based on the size and modification time of the file: the size doesn’t change here, and the modification time is stored/checked with a granularity of, often, 1 second.

Upvotes: 1

Related Questions