Python实现的从右到左字符串替换方法示例

def rreplace(self, old, new, *max):
  count = len(self)
  if max and str(max[0]).isdigit():
    count = max[0]
  while count:
    index = self.rfind(old)
    if index >= 0:
      chunk = self.rpartition(old)
      self = chunk[0] + new + chunk[2]
    count -= 1
  return self

def rreplace(self, old, new, *max):
  count = len(self)
  if max and str(max[0]).isdigit():
    count = max[0]
  return new.join(self.rsplit(old, count))

print rreplace("lemon tree", "e", "3")
print rreplace("lemon tree", "e", "3", 1)
print rreplace("lemon tree", "e", "3", 2)
print rreplace("lemon tree", "tree", "")
print rreplace("lemon tree", "notree", "notmatch")