在 python 中枚舉 function 的打印元素出現問題

Question

這是我的 python 應用程序代碼的一部分，它位於 for 循環本身中。 它從另一個文本文件中找到每個文件的名稱。

當我打印i時，它每次都會打印正確的行號。 問題出在sen上。 當我打印sen時，它只打印一個新行（ \n ）。 為什么它不包含每一行的內容？

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 

這是我的文本文件（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

主要問題是enumerate從 0 開始計數，而line_number初始化為 1。您需要將line_number更改為 0 或使用enumarate(..., start=1) 。

更新代碼：

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