Remove spaces before newlines

Question

I need to remove all spaces before the newline character throughout a string.

string = """
this is a line       \n
this is another           \n
"""

output:

string = """
this is a line\n
this is another\n
"""

Answer 1

可以拆分串入线，采用剥离右侧所有空格rstrip ，然后在每行的末尾添加一个新行：

''.join([line.rstrip()+'\n' for line in string.splitlines()])

Answer 2

import re
re.sub('\s+\n','\n',string)

Edit: better version from comments:

re.sub(r'\s+$', '', string, flags=re.M)

Answer 3

As you can find here ,

To remove all whitespace characters (space, tab, newline, and so on) you can use split then join:

sentence = ''.join(sentence.split())

or a regular expression:

import re
pattern = re.compile(r'\s+')
sentence = re.sub(pattern, '', sentence)