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Be specific when catching exceptions, and include only the essential, relevant code inside a try-expect!

Be specific when catching exceptions, and include only the essential, relevant code inside a try-except!

Also, it's a small thing, but the str.islower() and str.isupper() methods can be used on the entire string.

            if must_be_lowercase:
                for i in user_input:
                    if not i.islower():
                        print("Letters must be lowercase! Try again!")

It's best to keep names like i or j to refer to indices.

Also, you can use str.islower() on the entire string at once, which means the loop is superfluous.

The if statement

if not number % 2 == 0:

can be simplified to

if number % 2 != 0:

which also makes it less ambiguous.