如何在Python中使用分隔符将多行文本组合成一行？

Question

我有一个文本文件，其中包含以下内容：

line1
text1
text2
text3
line2
something1
something2

我想创建另一个类似于以下内容的文本文件：

line1|text1|text2|text3
line2|something1|something2

我想要在文本文件中每当一行出现单词"line"时，将该行下面的所有行用竖杠（|）作为分隔符添加到那一行后面。我能在Python中实现吗？

- coderman

Answer 1

如果您的文件不是非常大

data=open("file").readlines()
for n,line in enumerate(data):
    if line.startswith("line"):
       data[n] = "\n"+line.rstrip()
    else:
       data[n]=line.rstrip()
print '|'.join(data)

- ghostdog74

Answer 2

以下是一行代码，它使用line1, line2, ...，而不实际从该行读取数字：

['|'.join(['line%d' % i] + x.strip('\n').split('\n')) for i, x in enumerate(re.split('line[0-9]+', l)) if x.strip('\n')]

- ThiefMaster

Answer 3

def join_lines(lines, sent='line'):
    current = []
    for line in lines:
        if line.startswith(sent):
            yield current
            current = []

        current.append(line)
    yield current

# data = open('input.txt', 'rt')
data = """line1
text1
text2
text3
line2
something1
something2""".splitlines()

print ['|'.join(line) for line in join_lines(data) if line]

- Jochen Ritzel

Answer 4

current = None 
parts = [] 
with open('input', 'rb') as f:
    for line in f:
        if line.startswith('line'):
            current = [line.strip()]
            parts.append(current)
        elif current is not None:
            current.append(line.strip())

with open('output', 'w+b') as f:
    f.write('\n'.join(('|'.join(part) for part in parts)))

- Imran