清除换行符

gistfile1.py

#1.正则

strip("\r\n") #方法2

"".join(s.strip()) #方法3
#方法3的原理
'''
Return a list of the words of the string s.
If the optional second argument sep is absent or None,
the words are separated by arbitrary strings of whitespace characters
(space, tab, newline, return, formfeed). If the second argument sep is present and not None, 
it specifies a string to be used as the word separator.
'''