Capitalize every 3rd letter in a string - Python [closed]

Answer 1

If you don't care about letters and spaces:

''.join(phrase[i-1] if i % 3 or i == 0 else phrase[i-1].upper() for i in range(1, len(phrase) + 1))

If you only want to count letters:

new_phrase = ''
phrase = "here are some words"
counter = 0
for c in phrase:
    if not c.isalpha():
        new_phrase += c
    else:
        counter += 1
        if not counter % 3:
            new_phrase += c.upper()
        else:
            new_phrase += c

Since your example shows you using swapcase() instead of upper(), you can just replace upper() with swapcase() in this code to achieve that functionality if that's what you want.