刪除python文件中的記錄

Question

我有一個包含100個條目的文件。

如果一個記錄與用戶輸入的文件相匹配，我想從該文件中刪除該記錄內容。

我如何在python中做到這一點？

Answer 1

with open(your_f) as f: 
    lines = f.readlines() 
    for ind, line in enumerate(lines): 
     if your condition: # if line contains a match 
      lines[ind] ="" # set line to empty string 
    with open(your_f,"w") as f: # reopen with w to overwrite 
     f.writelines(lines) # write updated lines 

例如除去一個txt文件中的一行，與55開始：

with open("in.txt") as f: 
    lines = f.readlines() 
    for ind, line in enumerate(lines): 
     if line.startswith("55"): 
      lines[ind] = "" 
    with open("in.txt","w") as f: 
     f.writelines(lines) 

輸入：

foo 
bar 
55 foobar 
44 foo 

輸出：

foo 
bar 
44 foo