Question

我是Python编程的初学者使用PyCharm尝试练习功能，但返回以下错误：

名称'rflag'未定义但我认为它的定义！这是代码：

def searcher(word: str, text: str, num: int = 1):

   global startindex
   global size
   global rflag

   if num == 1 and text.count(word) == 1:
       startindex = text.find(word);
       size = len(word);
       rflag = "word start from " + str(startindex + 1) + " and end in " + 
       str(size + startindex)
   elif num > 1 and text.count(word) <= num:
       startindex = 0
       for i in range(num):
           startindex = text.find(word, startindex)
           size = startindex + len(word)
        rflag = "word start from " + str(startindex + 1) + " and end in " + 
        str(size + startindex)

    return rflag


result = searcher("shahab", "shahabshahabshahab", 2)
print(result)

完整的错误消息：

C：\ Users \ Shahab \ AppData \ Local \ Programs \ Python \ Python37-32 \ python.exe   C：/Users/Shahab/Desktop/searcher.py

回溯（最近通话最近一次）：

文件“ C：/Users/Shahab/Desktop/searcher.py”，第21行，在       结果= searcher（“ shahab”，“ shahabshahabshahab”，2）文件“ C：/Users/Shahab/Desktop/searcher.py”，第18行，在searcher中       返回rflag NameError：未定义名称'rflag'

以退出代码1完成的过程

缩进： code and indentation image

Answer 1

这将解决错误。

您只需要在if条件之前初始化rflag，因为这就是您要返回的内容

def searcher(word, text, num=1):
  rflag = ""
  if num == 1 and text.count(word) == 1:
    startindex = text.find(word);
    size = len(word);
    rflag = "word start from {} and end in {}".format(startindex+1, size+startindex)
  elif num > 1 and text.count(word) <= num:
    startindex = 0
    for i in range(num):
      startindex = text.find(word, startindex)
      size = startindex + len(word)
      rflag = "word start from {} and end in {}".format(startindex+1, size+startindex)
  return rflag

名称（？）未定义

1 个答案: