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I want to create an empty list and append some values inside this list. So far I know that if I want to create and empty list I can do it either like this:

list1 = []

or like this:

list1 = list()

(My apologies if there is another way that currently I don't know)

My question at this point is if there is a difference between those two ways to create a list; in terms of efficiency for example.

Thank you in advance for your help.

Paschalis Ag
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2 Answers2

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I Don't Think it makes any difference, I can not see why you need to declare a new list using the constructor.

list1 = [] and list1 = list() are the same as I know.

If you have literal values you should use the literal notation list1= ['a', 'b', 'c'] I don't even think it's possible to create a list with some values using the constructor.

The constructor main usage is when we want to convert a Map, Set or 'tuple' into a list

For example:

my_tuple = ('a', 'b', 'c')
my_list = list(my_tuple)
George
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The literal syntax, list1 = [], is slightly faster. There's been a handful of threads on this worth reading:

[] and {} vs list() and dict(), which is better?

Why is [] faster than list()?

Vincent D'Onofrio
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