连续变量不触发while循环答案

【问题标题】：Continues variable not triggering while loop连续变量不触发while循环
【发布时间】：2020-04-26 05:15:34
【问题描述】：

抱歉，如果这是重新发布。我正在尝试使用 continue 变量和 if/else 语句编写一个 while 循环。我的问题是我的continue 变量被忽略了，到目前为止我找不到问题。到目前为止，我已将 while continues == 'y' 条件移到 else 块中，现在我对为什么忽略此 var 感到有些困惑。

代码：

def add_to_existing_file(data):
# data[0]-api response
# data[1]-city
# infile-file object returned from openFile()
# file_name- file name string. check filetype & report version.

continues = 'y' # set up continue variable
while continues == 'y':
    file_name = input("Enter File Path to file to be appended: ") # get file from user
    if file_name is False:
        print("Now Creating Excel File..") # create condition for no user response.
        return # if empty response exit function
    else:
        infile = appends.openFile(file_name)  # open file to work with. Returns file object.
        added_data = appends.journal_report_1_to_df(infile, file_name, data[0], data[1]) # append selected file to existing df
    continues = input("Do you want to append another file? Y or N").lower() # check if new file
    return added_data # return new df w/appended data

【问题讨论】：

标签： python-3.x while-loop

【解决方案1】：

问题发生在最后一行。您将在第一次迭代结束时返回，该迭代退出循环。这可以通过将返回移动到外部范围来解决。

def add_to_existing_file(data):
    # data[0]-api response
    # data[1]-city
    # infile-file object returned from openFile()
    # file_name- file name string. check filetype & report version.

    continues = 'y' # set up continue variable
    while continues == 'y':
        file_name = input("Enter File Path to file to be appended: ") # get file from user
        if file_name is False:
            print("Now Creating Excel File..") # create condition for no user response.
            return # if empty response exit function
        else:
            infile = appends.openFile(file_name)  # open file to work with. Returns file object.
            added_data = appends.journal_report_1_to_df(infile, file_name, data[0], data[1]) # append selected file to existing df
        continues = input("Do you want to append another file? Y or N").lower() # check if new file

    return added_data # return new df w/appended data

【讨论】：

【解决方案2】：

如果您让第二个返回行（返回 added_data # return new df w/appended data）与您的 while 行具有相同的缩进，它应该可以工作。作为 continue 循环的基本大纲：

def function
   continues = 'y'
   while
      if :
      elif :
      else :
      print
      continue ?
   return

【讨论】：