Be careful with lru_cache in python

lru_mutable_results.py

from functools import lru_cache

@lru_cache(1)
def cached():
    return ["Do cached entries safely return the same thing?"]

def uncached():
    return ["Do cached entries safely return the same thing?"]


cached_result = cached()
cached_result[0] = "no"

# You would want these to return the same thing
print(uncached(), cached())

# Alas:
# > ['Do cached entries safely return the same thing?'] ['no']