map()
The map()
built-in function accepts a function and applies it to every item in an iterable. It outputs a map object.
Syntax
map(func_name, iterable)
The func_name
is the function to be applied to the iterable and can be a lambda function or the name of any defined function. The iterable
, such as a list, contains the items the function will act on.
In the examples below list()
is applied to the map expression to return a new list.
Example
The following example uses map()
to return the length of each string in the list some_strings
:
some_strings = ['learn', 'how', 'to', 'code', 'online']print(list(map(len, some_strings)))# Output: [5, 3, 2, 4, 6]
Codebyte Example
The map()
function can be used to transform all the list items to integers: