This content originally appeared on flaviocopes.com and was authored by flaviocopes.com
Functions in Python can be nested inside other functions.
A function defined inside a function is visible only inside that function.
This is useful to create utilities that are useful to a function, but not useful outside of it.
You might ask: why should I be “hiding” this function, if it does not harm?
One, because it’s always best to hide functionality that’s local to a function, and not useful elsewhere.
Also, because we can make use of closures (more on this later).
Here is an example:
def talk(phrase):
def say(word):
print(word)
words = phrase.split(' ')
for word in words:
say(word)
talk('I am going to buy the milk')If you want to access a variable defined in the outer function from the inner function, you first need to declare it as nonlocal:
def count():
count = 0
def increment():
nonlocal count
count = count + 1
print(count)
increment()
count()This is useful especially with closures, as we’ll see later.
This content originally appeared on flaviocopes.com and was authored by flaviocopes.com
flaviocopes.com | Sciencx (2021-01-06T05:00:00+00:00) Python Nested Functions. Retrieved from https://www.scien.cx/2021/01/06/python-nested-functions/
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