Python splitlines使用技巧

mulLine = """Hello!!!
Wellcome to Python's world!
There are a lot of interesting things!
Enjoy yourself. Thank you!"""

print ''.join(mulLine.splitlines())
print '------------'
print ''.join(mulLine.splitlines(True))

输出结果：
Hello!!! Wellcome to Python's world! There are a lot of interesting things! Enjoy yourself. Thank you!
------------
Hello!!!
Wellcome to Python's world!
There are a lot of interesting things!
Enjoy yourself. Thank you!

利用这个函数，就可以非常方便写一些段落处理的函数了，比如处理缩进等方法。如Cookbook书中的例子：

def addSpaces(s, numAdd):
white = " "*numAdd
return white + white.join(s.splitlines(True))
def numSpaces(s):
return [len(line)-len(line.lstrip( )) for line in s.splitlines( )]
def delSpaces(s, numDel):
if numDel > min(numSpaces(s)):
raise ValueError, "removing more spaces than there are!"
return '\n'.join([ line[numDel:] for line in s.splitlines( ) ])
def unIndentBlock(s):
return delSpaces(s, min(numSpaces(s)))