Question

我有一个文本文件，想要在Windows上使用Python 3.5在两行之间打印行。我想将戏剧的人物打印到另一个文件。文本文件如下所示：

...
Characters:
Peter, the king.
Anna, court lady.
Michael, caretaker.
Andre, soldier.
Tina, baker.
First scene.
...

我想打印“Characters：”和“First scene”之间的所有字符名称。我的第一次尝试是：

newfile = open('newfile.txt', 'w')
with open('drama.txt', 'r') as f:
for line in f:
    if line.startswith('Characters:'):
        print(next(f), file = newfile)

但是这只打印一行，我需要几行，而next（）函数的迭代在打印一行后总是导致StopIteration Error。那么有没有办法说：打印“Characters：”和“First Scene”这两行之间的所有行？使用索引并不是真的可行，因为我正在为几部戏剧做这件事并且他们拥有不同数量的角色。

Answer 1

regex解决方案：

import re
f = open('drama.txt', 'r')
content = f.read()
x = re.findall(r'Characters:(.*?)First scene\.', content, re.DOTALL)
print("".join(x))

'''
Peter, the king. 
Anna, court lady. 
Michael, caretaker. 
Andre, soldier. 
Tina, baker.
'''

Answer 2

您可以设置布尔值以了解是否要打印一行：

newfile = open('newfile.txt', 'w')

printing = False

with open('drama.txt', 'r') as f:
    for line in f:
        if line.startswith('Characters:'):
            printing = True
            continue # go to next line
        elif line.startswith('First scene'):
            printing = False
            break # quit file reading

        if printing:
            print(line, file=newfile)
newfile.close()

从文本文件

2 个答案: