CODEWITHSUNDEEP
pythonpython-3.x
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Reputation: 4538

How does the "all" function in Python work?

I searched for understanding about the all function in Python, and I found this, according to here:

all will return True only when all the elements are Truthy.

But when I work with this function it's acting differently:

'?' == True   # False
'!' == True   # False
all(['?','!']) # True

Why is it that when all elements in input are False it returns True? Did I misunderstand its functionality or is there an explanation?

Upvotes: 6

Views: 1726

Answers (3)

Vibhu Pandey
Vibhu Pandey

Reputation: 1

all() function is used when we want to check that if all the items in a list are iterable or not. For ex : x=[1,2,3,4,5] all(x) It will return True.

Upvotes: -2

Carcigenicate
Carcigenicate

Reputation: 45806

'?' and '!' are both truthy since they are non-empty Strings.

There's a difference between True and "truthy". Truthy means that when coerced, it can evaluate to True. That's different from it being == to True though.

Upvotes: 2

L3viathan
L3viathan

Reputation: 27333

only when all the elements are Truthy.

Truthy != True.

all essentially checks whether bool(something) is True (for all somethings in the iterable).

>>> "?" == True
False
>>> "?" == False # it's not False either
False
>>> bool("?")
True

Upvotes: 10

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