list() function creates and returns a new list object. When used without an argument, it returns an empty list. When used with the optional
iterable argument, it initializes the new list with the elements in the iterable.
Read more about lists in our full tutorial about Python Lists.
Learn by example! Here are some examples of how to use the
list() built-in function:
You can create an empty list by skipping the argument:
>>> list() 
>>> list([1, 2, 3]) [1, 2, 3]
Note that it really creates a new list object that is different from the one passed as an argument:
>>> x = [1, 2, 3] >>> y = list(x) >>> x is y False >>> x == y True
The new list
y has the same elements as the original list
x. But it’s still a different object as you can see from the check
x is y that returns
You can use the
list() method with or without the optional
Syntax: There are two ways of using the constructor:
list() -> new empty list list(
iterable) -> new list initialized with elements in iterable
Interactive Shell Exercise: Understanding list()
Consider the following interactive code:
Exercise: Guess the output before running the code.
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list() function creates and returns a new list object.
- When used without an argument, it returns an empty list.
- When used with the optional
iterableargument, it initializes the new list with the elements in the iterable.
>>> list()  >>> list([1, 2, 3]) [1, 2, 3]
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