CODEWITHSUNDEEP
pythonpython-3.ximport
ab123
ab123

Reputation: 213

Saving large output data of one program to be used by another

Let's say in a file A.py and I am computing value of some variable x by some lengthy procedure, such that code takes around 15-30 seconds to execute.

I want to use value of x in another program B.py.

I have thought of importing x to another file B.py but when B executes, it executes A again in order to calculate x. B takes another 1-2 minutes to execute, so it's essential that I just use the output x. I tried to put it under if __name__ == "main", but how will I compute x then?

Also, I have tried copying the value of x to a text file as mentioned here, but x is a very large list (around 10000 length), so output just shows "..." and omits printing most of it.

Upvotes: 0

Views: 64

Answers (2)

Dronir
Dronir

Reputation: 975

When you don't need to run A.py for any other reason except to produce x (to be used i B.py), then you could simply have the code that returns x in a function called compute_x() and then in B.py write from A import compute_x and call the function in B.py.

Upvotes: 0

nicoco
nicoco

Reputation: 1553

I think you want to use pickle.

import pickle

very_long_list = [1,2,3]
file_name = "/tmp/very_long_list.pickle"

pickle.dump(very_long_list, open(file_name, "wb"))

del very_long_list

very_long_list = pickle.load(open(file_name, "rb"))
print(very_long_list)  # prints [1,2,3], we did it!

Upvotes: 2

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