Enumerate is a built-in function of Python. It’s usefulness can not be summarized in a single line. Yet most of the newcomers and even some advanced programmers are unaware of it. It allows us to loop over something and have an automatic counter. Here is an example:
for counter, value in enumerate(some_list): print(counter, value)
This is not it.
enumerate also accepts some optional arguments which
make it even more useful.
my_list = ['apple', 'banana', 'grapes', 'pear'] for c, value in enumerate(my_list, 1): print(c, value) # Output: # 1 apple # 2 banana # 3 grapes # 4 pear
The optional argument allows us to tell
enumerate from where to
start the index. You can also create tuples containing the index and
list item using a list. Here is an example:
my_list = ['apple', 'banana', 'grapes', 'pear'] counter_list = list(enumerate(my_list, 1)) print(counter_list) # Output: [(1, 'apple'), (2, 'banana'), (3, 'grapes'), (4, 'pear')]