Correct Sentence

问题描述：

For the input of your function, you will be given one sentence. You have to return a corrected version, that starts with a capital letter and ends with a period (dot).

Pay attention to the fact that not all of the fixes are necessary. If a sentence already ends with a period (dot), then adding another one will be a mistake.

Input: A string.

Output: A string.

def correct_sentence(text: str) -> str:"""returns a corrected sentence which starts with a capital letterand ends with a dot."""# your code herereturn textif __name__ == '__main__':print("Example:")print(correct_sentence("greetings, friends"))# These "asserts" are used for self-checking and not for an auto-testingassert correct_sentence("greetings, friends") == "Greetings, friends."assert correct_sentence("Greetings, friends") == "Greetings, friends."assert correct_sentence("Greetings, friends.") == "Greetings, friends."assert correct_sentence("hi") == "Hi."assert correct_sentence("welcome to New York") == "Welcome to New York."print("Coding complete? Click 'Check' to earn cool rewards!")

那么就是对于字符串的首字母大写，然后如果末尾不是句号，就加个句号。

试了一下string.capitalize(),发现不行，它会将字符串的第一个字母变成大写,其他字母变小写。

所以只能切片，再转换。用capitalize，upper或者title都可以。

def correct_sentence(text: str) -> str:"""returns a corrected sentence which starts with a capital letterand ends with a dot."""# your code heretext=text[0].upper()+text[1:]if text[-1]=='.':return textelse:text=text+'.'return text

可以再精简一下：

    text=text[0].upper()+text[1:]return text if text[-1]=='.' else text+'.'

其他解决方案：可以用join，

return "".join([text[0].upper(), text[1:].strip("."), "."])

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