问replace_ending函数将句子中的旧字符串替换为新字符串，但前提是句子以旧字符串结束
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Stack Overflow用户

提问于 2020-04-11 14:53:34

回答 29查看 22.7K关注 0票数 0

replace_ending函数用新字符串替换句子中的旧字符串，但前提是句子以旧字符串结束。如果句子中有多个旧字符串，则只替换末尾的字符串，而不是所有字符串。例如，replace_ending("abcabc"，"abc"，"xyz")应该返回abcxyz，而不是xyzxyz或xyzabc。字符串比较是区分大小写的，所以replace_ending(" abcabc "，"ABC"，"xyz")应该返回abcabc(不做任何更改)。

def replace_ending(sentence, old, new):
# Check if the old string is at the end of the sentence 
if ___:
    # Using i as the slicing index, combine the part
    # of the sentence up to the matched string at the 
    # end with the new string
    i = ___
    new_sentence = ___
    return new_sentence

# Return the original sentence if there is no match 
return sentence

print(replace_ending("It's raining cats and cats", "cats", "dogs")) 
# Should display "It's raining cats and dogs"
print(replace_ending("She sells seashells by the seashore", "seashells", 
"donuts")) 
# Should display "She sells seashells by the seashore"
print(replace_ending("The weather is nice in May", "may", "april")) 
# Should display "The weather is nice in May"
print(replace_ending("The weather is nice in May", "May", "April")) 
# Should display "The weather is nice in April"

python-3.x

string

ends-with

回答 29

Stack Overflow用户

发布于 2020-04-11 15:06:31

答案如下。这个问题属于谷歌对python的学习。

def replace_ending(sentence, old, new):
# Check if the old string is at the end of the sentence 
    if sentence.endswith(old):
    # Using i as the slicing index, combine the part
    # of the sentence up to the matched string at the 
    # end with the new string
        i = sentence.rfind(old)
        new_sentence = sentence[:i]+new
    return new_sentence

# Return the original sentence if there is no match 
return sentence

票数 6

Stack Overflow用户

发布于 2020-05-07 20:14:40

def replace_ending(sentence, old, new):
# Check if the old string is at the end of the sentence 
    if sentence.endswith(old):
    # Using i as the slicing index, combine the part
    # of the sentence up to the matched string at the 
    # end with the new string
        i = len(old)
        new_sentence = sentence[:-i]+new
    return new_sentence

# Return the original sentence if there is no match 
return sentence

票数 2

Stack Overflow用户

发布于 2020-06-05 16:17:39

def replace_ending(sentence, old, new):
# Check if the old string is at the end of the sentence 
if sentence.endswith(old):
    # Using i as the slicing index, combine the part
    # of the sentence up to the matched string at the 
    # end with the new string
    i=len(sentence) 
    l=len(old)
    new_sentence = sentence[0:i-l] + new
    return new_sentence

# Return the original sentence if there is no match 
return sentence