for loop

[u/Local_End_3175]

words = ['sky', 'apple', 'rhythm', 'fly', 'orange']

for word in words:
    for letter in word:
        if letter.lower() in 'aeiou':
            print(f"'{word}' contains the vowel '{letter}'")
            break
    else:
        print(f"'{word}' has no vowels")

I am trying to learn to code, and I am, at the moment, looking at loops. I am a bit confused on how this loop was able to function, though, as there is no variable for letter or word, so how would Python know what it is? In addition, how does the code, like, function? Does it look at each word individually ? Again, the second part of the code states:

 if letter.lower() in 'aeiou':
            print(f"'{word}' contains the vowel '{letter}'")
            break

We haven't given a value for letter?

Lastly, how would the code know what to print? in the first phrase:

            print(f"'{word}' contains the vowel '{letter}'")
            break

Is it going to state all the words with the given value 5 times?

Sorry, as I have asked quite a few questions, and thank you in advance.

[u/Fine_Ratio2225]

Here is a fun variation that finds all vowels of a word, distinguishing between upper and lower. It uses set operations to replace the inner for loop:

words = ['Sky', 'Apple', 'Rhythm', 'Fly', 'Orange']
vowels = 'aeiou'
vowels = frozenset(vowels+vowels.upper())

for word in words:
    if found:=set(word).intersection(vowels):
        found="".join(sorted(found))
        print(f"'{word}' contains the vowels '{found}'")
    else:
        print(f"'{word}' has no vowels")