替换字符串中的值 [英] Replace values in a string

问题描述

因此，挑战在于用星号替换句子中的特定单词，其长度等于该单词的长度-3个字母-> 3个星号，等等.

So the challenge was to replace a specific word in a sentence with asterisks with equivalent length to that word - 3 letters --> 3 asterisks etc.

第一节不起作用，但是第二节却可以-有人可以批评第一节，也许指出我可能犯的错误，因为逻辑本来听起来很合理?

Section One does not work, but Section Two does - can anyone critique Section One and maybe point out the possible mistake I was making, as the logic seemed sound originally?

def censor(text, word):
  for c in text:
    if c == word:                         ## this line was totally wrong
      text.replace(c, "*" * len(c))
    return text

下一段工作​​了，然后CodeAcademy的答案就大不相同了:

The next segment does work, then CodeAcademy's answer was way different:

def censor(text, word):
  a = "*" * len(word)
  for c in text:
    nw = text.split(word)
  return a.join(nw)

您将如何处理此任务?

How would you approach this task?

推荐答案

第二种解决方案也不完美:

The second solution is not perfect either:

def censor(text, word):
  a = "*" * len(word)
  nw = text.split(word)  # no need for a loop here, one split catches all occurrences
  return a.join(nw)

第一次尝试:

def censor(text, word):
  # for c in text:  # loops char by char
  #  if c == word:  # one character likely won't be your word
  #    text.replace(c, "*" * len(c))  # does nothing, string is immutable
  return text.replace(word, "*" * len(word))  # simple!

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