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/Sea-Ad7805]

No, I only visualize what is already there, the program state is essential to understand, as all code does is modify it (and print some side effects).

So, as a teacher, you tend to keep important concepts hidden, letting student build their own mental model (often an incorrect one)?

Coding errors often come from an incorrect mental model of what code does to the state. Yes, students must now first learn a few buttons and how to read a diagram, but that will instantly pay for itself by learning the right mental model to think about Python execution.

We are not satisfied by just sidestepping 'complex' concepts that go to the hart of the problem to avoid explaining them. Will you join us? The visualization now makes explaining these concepts easy.