Boolean operators:

not is evaluated first;
and is evaluated next;
or is evaluated last.
For example, True or not False and Falsereturns True.

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Pyg Latin:
目標: 將使用者輸入的單字字首移到最後，並在字尾加上ay (e.q. python -> ythonpay)

pyg = 'ay'

original = input('Enter a word:')

if len(original) > 0 and original.isalpha():
    word=original.lower()
    first=word[0]
    new_word=word+first+pyg
    new_word=new_word[1:len(new_word)]
    print(new_word)
else:
    print('empty')