python - 如何让Python同时识别小写和大写输入？

Question

我是 Python 新手。我正在编写一个程序来区分单词是否以元音开头。问题是，该程序只能正确处理大写字母作为输入。例如，如果我提供单词“Apple”作为输入，则结果为 True；但是，如果提供单词“apple”作为输入，则结果为 False。我如何解决它？

word = input ("Please Enter a word:")
if (word [1] =="A") :
    print("The word begins with a vowel")
elif (word [1] == "E") :
    print("The word begins with a vowel")
elif (word [1] == "I") :
    print("The word begins with a vowel")
elif (word [1] == "O") :
    print("The word begins with a vowel")
elif (word [1] == "U") :
    print("The word begins with a vowel")
else:
    print ("The word do not begin with a vowel")

Answer 1

首先将单词完全转换为小写(或大写):

word = input("Please Enter a word:").lower()  # Or `.upper()`

此外，要获取单词的首字母，请使用 word[0]，而不是 word[1]。列表在 Python 和几乎所有编程语言中都是零索引的。

您还可以压缩代码:

word = input("Please Enter a word:")

if word[0].lower() in 'aeiou':
    print("The word begins with a vowel")
else:
    print("The word do not begin with a vowel")