How to reuse an output of a function? [duplicate]

Question

I'm trying to reuse the output of the time-consuming function in other functions without re-run it again. example:

%%time

def func1():

    sleep(100)

    y = 123

    return y

func1()

Wall time: 100 s

%%time 

def func2():

    x = func1()

    return x

func2()

Wall time: 100 s

I want func2 to reuse my output of fun1 without waiting for another 100 all over again. 

Answer 1

You can use the functools.lru_cache for a task:

from time import sleep

from functools import lru_cache

@lru_cache

def func1():

    sleep(3)

    y = 123

    return y

print(func1())  # <-- this waits 3 seconds

print(func1())  # <-- this is printed immediately

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