Caesar cipher

[stullis]

On line 23, you cannot slice character. Character is a single alpha character. By iterating over text, you are already retrieving individual characters from text. Line 23 can be rewritten as:

character = the corresponding character in shifted_alphabet

I don't think enumerate() is the best way to go about this. Since you have both original and shifted, you could use zip() instead to directly connect the two:

original = string.ascii_lowercase
original = deque(list(original))
shifted = original.copy()
shifted.rotate(3)

for char1, char2 in zip(original, shifted):
    print(f"{char1} to {char2}")

With that in mind, I recommend using zip() to combine them and then converting the result into a dictionary. Then, you can iterate over the clear text and use each character to index the dictionary for the cipher character.