如何去掉逗号，形成python程序

Question

我想删除我的计数器应用程序在每行末尾的逗号。我试过 r.strip 东西，但我不确定如何正确使用它。

REPL LINK: repl

def counter(start, stop):
  x = start
  if start > stop:
      return_string = "Counting down: "
      while x >= stop:
          return_string += str(x)
          x = x-1
          if start != stop:
              return_string += ","
  else:
      return_string = "Counting up: "
      while x <= stop:
          return_string += str(x)
          x = x + 1
          if start != stop:
              return_string += ","

  return return_string

print(counter(1, 10)) # Should be "Counting up: 1,2,3,4,5,6,7,8,9,10"
print(counter(2, 1)) # Should be "Counting down: 2,1"
print(counter(5, 5)) # Should be "Counting up: 5"

谢谢。

Answer 1

如果您想更正您的代码，您可以稍微更改您的条件以调整逗号的添加方式（尽管有许多奇特的方式您可以写得更好）：

def counter(start, stop):
  x = start
  if start > stop:
      return_string = "Counting down: "
      while x >= stop:
          return_string += str(x)
          x = x-1
          if x != stop-1:
              return_string += ","
  else:
      return_string = "Counting up: "
      while x <= stop:
          return_string += str(x)
          x = x + 1
          if x != stop+1:
              return_string += ","

  return return_string

或者，您可以快速替换这行代码：

return return_string

与：

return return_string.rstrip(',')

如何去掉逗号，形成python程序

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