从文件中删除一行及其上一行

Question

我有以下文件：

>Line1
Some contents of line 1
>Line2
------Some contents I don't need
>Line3
More content of line 3

我尝试删除以---开头的行以及前一行，结果如下：

>Line1
Some contents of line 1
>Line3
More content of line 3

这是我当前的代码，目前我只能删除以---开头的行，但不能删除它前面的行：

with open("test.txt") as f1:
    for lines in f1:
        if lines.startswith("---"):
            pass
        else:
            print(lines)

Answer 1

这里有一个建议：

with open ("test.txt") as f:
   line1 = f.readline()
   while line1:
      line2 = f.readline()
      if not line2.startswith("---"):
         print(line1,"\n",line2)
      line1 = f.readline()