Question

python：读取文件并重复每一行两次编号输出行

实施例：鉴于此文件：

Invictus

Out of the night that covers me
Black as the pit from pole to pole
I thank whatever gods there may be
For my unconquerable soul

这是输出：

1 Invictus
1 Invictus
2
2
3 Out of the night that covers me
3 Out of the night that covers me
4 Black as the pit from pole to pole
4 Black as the pit from pole to pole
5 I thank whatever gods there may be
5 I thank whatever gods there may be
6 For my unconquerable soul
6 For my unconquerable soul

这是我到目前为止的代码，我还没有找到在每一行放置双重编号所需的循环：

fileicareabout = open("ourownfile","r")
text = fileicareabout.readlines()
count = len(open("ourownfile").readlines(  ))
fileicareabout.close()
def linecount(ourownfile):
    count = 0
    for x in open("ourownfile"):
        count += 1
    return count

for words in text:
    print (str(linecount) + words) * 2
print

Answer 1

您是否说在将每行粘贴两次时需要增加编号？所以它需要是： 1 Invictus

2 Invictus

3

4

5夜间覆盖我

如果是这样，你的循环应如下所示：

count = 0
for words in text:
      print(str(count) + words)
      count += 1
      print(str(count) + words)
      count += 1

Answer 2

乘法运算符（*）可能很方便。

示例：

>>> '15 hello world\n' * 2 '15 hello world\n15 hello world\n'

遵循相同的逻辑：

counter = 1 with open('input.txt') as input_file: with open('output.txt', 'w') as output_file: for line in input_file: output_file.write( '{} {}'.format(counter, line) * 2 ) counter += 1

<强> input.txt中：

hello world my name is Sait

<强> output.txt的：

1 hello 1 hello 2 world 2 world 3 my 3 my 4 name 4 name 5 is 5 is 6 Sait 6 Sait

Answer 3

您可以使用枚举来统计您的行号：

with open("ourownfile") as f:
    for line_no, line in enumerate(f, 1):
        print "{} {}".format(line_no, line)*2,

或使用较新的打印功能（python 3需要）：

from __future__ import print_function

with open("ourownfile") as f:
    for line_no, line in enumerate(f, 1):
        print("{} {}".format(line_no, line)*2, end='')

要获得确切的输出，您似乎跳过了第一行：

with open("ourownfile") as f:
    for line_no, line in enumerate(f):
        if line_no == 0:
            continue
        print("{} {}".format(line_no, line)*2, end='')

在Python中为每个输出行编号

3 个答案: