[Python] How to inform another python file that the function completed in another program

I have two separate python programs running in jupyter notebook.

Program 1 looks like this

def doSomeCalculations():
data_dic = doSomeCalculations()
with open("data.pkl", 'wb') as f:
pickle.dump(data_dic, f)


Program 2 looks like this:

import time
import pickle
import os
while True:
if time.time()-os.path.getmtime("data.pkl")<1:
with open("data.pkl", 'rb') as f:
data = pickle.load(f)
break
time.sleep(0.001)
print("Running now")


This is how, currently I am sending data between two files. First I inform the second program that the results are ready, then it reads the results in a file.

How to improve this process? This is very inefficient, as I am reading the last modified time of the file every 1ms. Any better option?

and I do this thing like 10 times in both files, not just once.

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