python-如果一行和下一行以特定字符串开头，则在它们之间打印0

Question

我有一个文本文件，如下所示：

line1
1
2
line2
line3
1
2
line4
1
2
line5
line6

如果一行和下一行以字符串line开头，则它应该  在行之间打印0。

所以输出应该如下所示：

line1
1
2
line2
0
0
line3
1
2
line4
1
2
line5
0
0
line6

Answer 1

如果我理解正确，文件如下：

line1
1
2
line2
line3
1
2
line4
...

如果您想添加两个新行＆＃39; 0＆＃39;你应该这样做：

with open("your_file.txt") as txt_file:
    lines = txt_file.readlines()
prev_starts_with_line = False
for line in lines:
    if line.find("line") == 0:
        if prev_starts_with_line:
            print "0\n0"
        prev_starts_with_line = True
    else:
        prev_starts_with_line = False
    print line.strip()

输出将是：

line1
1
2
line2
0
0
line3
1
2
line4