How is the output False, True?

Question

print(bool(([])))
print(bool([()]))
output: False
True

Answer 1

You can figure this out by running this code

x = ([])
y = [()]
print(x, type(x), len(x))
print(y, type(y), len(y))

x is an empty list
y is a list with one element which is an empty tuple

Answer 2

Shantanu ,

i have added some more samples how to create tuples. see also my comments in the file.

https://code.sololearn.com/cTQEKS67wPIM/?ref=app

Answer 3

It's the rule in python. Empty containers are falsey.
https://www.freecodecamp.org/news/truthy-and-falsy-values-in-python/

Answer 4

Shantanu
what you should concentrate on is that while:
a = ()
creates an empty tuple,
a = ([])
creates an empty list.😁
if you want a tuple containing an empty list, you would have to write
a = ([],)
or
a = [],

tuple is the one with the strange syntax.

() for empty, but only comma "," matters if there are elements.
a = 1, 2, 3
is the same as
a = (1, 2, 3)
and
a = ( , ) is an error.😲

Answer 5

Tibor Santa why does empty list give False as output?

Answer 6

Tibor Santa Thank you 😃

Answer 7

Lothar Thank you 😃

Answer 8

Bob_Li Thank you 😃