如何加入繼續線與Python中的省略號（...）

Question

''' 
    This is single line. 
    This is second long line 
    ... continue from previous line. 
    This third single line. 
''' 

我想連接用省略號（...）分開的行。這我想用Python做。長行由新行（\ n）和省略號（...）分隔。我正在逐行閱讀該文件，並在特定行上執行一些操作，但以新行（\ n）繼續行結束，下一行以省略號（...）開始。正因爲如此，我無法獲得全線做具體操作。

我作爲例子的線條來自大文件（超過800行）。 python實用程序解析文件，搜索具有特定關鍵字的行，並用新語法替換該行的一部分。這我想對多個文件做。

請告訴我。

Answer 1

您可以分割線斷行，然後通過循環，並添加省略號線前行，像這樣：

lines = lines.split('\n') 
for i, line in enumerate(lines): 
    line = line.strip().lstrip() 
    if line.startswith('...') and i != 0: 
     lines[i - 1] = lines[i - 1].strip().lstrip() + line.replace('...', '') 
     del lines[i] 

Answer 2

你可以簡單地做：

delim = '...' 
text = '''This is single line. 
      This is second long line 
      ... continue from previous line. 
      This third single line. 
     ''' 

# here we're building a list containing each line 
# we'll clean up the leading and trailing whitespace 
# by mapping Python's `str.strip` method onto each 
# line 
# this gives us: 
# 
# ['This is single line.', 'This is second long line', 
# '... continue from previous line.', 'This third single line.', ''] 
cleaned_lines = map(str.strip, text.split('\n')) 

# next, we'll join our cleaned string on newlines, so we'll get back 
# the original string without excess whitespace 
# this gives us: 
# 
# This is single line. 
# This is second long line 
# ... continue from previous line. 
# This third single line. 
cleaned_str = '\n'.join(cleaned_lines) 

# now, we'll split on our delimiter '...' 
# this gives us: 
# 
# ['This is single line.\nThis is second long line\n', 
# ' continue from previous line.\nThis third single line.\n'] 
split_str = cleaned_str.split(delim) 

# lastly, we'll now strip off trailing whitespace (which includes) 
# newlines. Then, we'll join our list together on an empty string 
new_str = ''.join(map(str.rstrip, split_str)) 

print new_str 

其輸出

This is single line. 
This is second long line continue from previous line. 
This third single line.