Python字符串替换

我在上谷歌的Python课程：

链接到练习：

练习： ./googlepython练习/basic/strings2.py

在以下考试中：

# E. not_bad
# Given a string, find the first appearance of the
# substring 'not' and 'bad'. If the 'bad' follows
# the 'not', replace the whole 'not'...'bad' substring
# with 'good'.
# Return the resulting string.
# So 'This dinner is not that bad!' yields:
# This dinner is good!
def not_bad(s):
  +++your code here+++
  return

我的回答是：

def not_bad(s):
  not_position = s.find('not')
  bad_position = s.find('bad')
  if bad_position > not_position:
    s = s.replace(s[not_position:],'good')
  return s

当我运行检查器时，我得到以下信息：

not_bad
 OK  got: 'This movie is good' expected: 'This movie is good'
  X  got: 'This dinner is good' expected: 'This dinner is good!'
 OK  got: 'This tea is not hot' expected: 'This tea is not hot'
 OK  got: "It's bad yet not" expected: "It's bad yet not"

---

我相信“这顿饭很好”==“这顿饭很好”，但我不确定为什么我没有得到“OK”状态，而是“X”。我相信我没有正确的考试，但输出仍然是正确的。我是Python新手，因此对此发表评论将不胜感激

你错过了感叹号

在预期答案中。纠正解决方案的一种方法是使用查找
bad
的结果指定并合并替换子字符串的结束索引
 你错过了感叹号
在预期答案中。纠正解决方案的一种方法是使用查找
bad
的结果指定并合并替换子字符串的结束索引
 我已经设法解决了这个问题：

def not_bad(s):
  not_position = s.find('not')
  bad_position = s.find('bad')
  if bad_position > not_position:
    s = s.replace(s[not_position:bad_position+3],'good')
  return s

not_bad
 OK  got: 'This movie is good' expected: 'This movie is good'
 OK  got: 'This dinner is good!' expected: 'This dinner is good!'
 OK  got: 'This tea is not hot' expected: 'This tea is not hot'
 OK  got: "It's bad yet not" expected: "It's bad yet not"

我设法解决了这个问题：

def not_bad(s):
  not_position = s.find('not')
  bad_position = s.find('bad')
  if bad_position > not_position:
    s = s.replace(s[not_position:bad_position+3],'good')
  return s

not_bad
 OK  got: 'This movie is good' expected: 'This movie is good'
 OK  got: 'This dinner is good!' expected: 'This dinner is good!'
 OK  got: 'This tea is not hot' expected: 'This tea is not hot'
 OK  got: "It's bad yet not" expected: "It's bad yet not"

很好！=好!。注意
很好的观点，我将尝试修复它
很好！=好!。注意
很好的一点，我将尝试修复它