在 python 中枚举 function 的打印元素出现问题

Question

这是我的 python 应用程序代码的一部分，它位于 for 循环本身中。 它从另一个文本文件中找到每个文件的名称。

当我打印i时，它每次都会打印正确的行号。 问题出在sen上。 当我打印sen时，它只打印一个新行（ \n ）。 为什么它不包含每一行的内容？

line_number=1
for line in open(relevant_docs_path, "r",encoding="utf8"):
  
  if line.rstrip('\n') == file_name:
    with open(relevant_docs_path) as fp:
      for i, sen in enumerate(fp):
        if i == line_number+1:
          print(sen)
    break
  else:
    line_number += 1 

这是我的文本文件（fp）：

1.persian_query
7894.persian_poem 7895.persian_poem 7898.persian_poem 7899.persian_poem 7900.persian_poem

2.persian_query
7901.persian_poem 7902.persian_poem

3.persian_query
7901.persian_poem 7902.persian_poem

4.persian_query
7903.persian_poem

5.persian_query
7904.persian_poem 7905.persian_poem 7906.persian_poem 7907.persian_poem 7908.persian_poem 7909.persian_poem 7910.persian_poem 7911.persian_poem 7912.persian_poem 7913.persian_poem 7914.persian_poem 7915.persian_poem 7916.persian_poem 7917.persian_poem 7918.persian_poem 7919.persian_poem 7920.persian_poem 7921.persian_poem 7922.persian_poem 7923.persian_poem 7924.persian_poem

Answer 1

主要问题是enumerate从 0 开始计数，而line_number初始化为 1。您需要将line_number更改为 0 或使用enumarate(..., start=1) 。

更新代码：

line_number = 1
for line in open(relevant_docs_path, "r", encoding="utf8"):
  if line.rstrip('\n') == file_name:
    with open(relevant_docs_path) as fp:
      for i, sen in enumerate(fp, start=1):
        if i == line_number+1:
          print(sen)
    break
  else:
    line_number += 1