如何將多行文本合併到P​​ython中的一行中並使用分隔符將它們分開？

Question

我有一個文本文件中的以下內容：

line1 
text1 
text2 
text3 
line2 
something1 
something2 

我想創建另一個文本文件看起來像這樣：

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

只要在文本文件中的行說「行」我想使用'|'將下面的每一行添加到該行中分隔符。我可以用Python做到這一點嗎？

Answer 1

如果你的文件是不是非常大

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) 

Answer 2

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))) 

Answer 3

這裏是一個一行它採用line1, line2, ...而不實際從該行讀取數：

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

Answer 4

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]