Built-in Functions in Python

14 Jun, 2023

Trey talks about a number of built-in functions but I only listed a couple that I didn’t know.

enumerate

If you need to count upward, one number at a time while looping over an iterable at the same time, the enumerate function will come in hand.

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>>> with open('hello.txt', mode='rt') as my_file:
...     for n, line in enumerate(my_file, start=1):
...         print(f'{n:03}', line)
...
001 This is the first line of the file
002 This is the second line of the file

If you are using range(len(sequence)), you should use enumerate instead.

zip

The zip function is used for looping over multiple iterables at the same time.

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>>> one_iterable = [2, 1, 3, 4, 7, 11]
>>> another_iterable = ['P', 'y', 't', 'h', 'o', 'n']
>>> for n, letter in zip(one_iterable, another_iterable):
...     print(letter, n)
...

P 2
y 1
t 3
h 4
o 7
n 11

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#Python #Zip #Enumerate #Trey Hunner