Loops in List

[snippsat]

The unwritten rule is simple,never use range(len(sequence)).
If need index or manipulate index always enumerate()
Eg:

# Find index of Lemon in list
lst = ['Apple', 'Lemon', 'Orange']
for index, item in enumerate(lst):
    if item == 'Lemon':
        print(f'Lemon is at index: {index}')

Output:
Lemon is at index: 1

We see this way in more places eg iterate over dict:

emails = {
     'Bob': '[email protected]',
     'Alice': '[email protected]',
 }

for name, email in emails.items():
    print(f'{name} -> {email}')

Output:
Bob -> [email protected]
Alice -> [email protected]

A couple of video:
Transforming Code into Beautiful, Idiomatic Python
Loop like a native: while, for, iterators, generators