删除python文件中的记录

Question

我有一个包含100个条目的文件。

如果一个记录与用户输入的文件相匹配，我想从该文件中删除该记录内容。

我如何在python中做到这一点？

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 

例如除去一个txt文件中的一行，与55开始：

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) 

输入：

foo 
bar 
55 foobar 
44 foo 

输出：

foo 
bar 
44 foo