How to strip double spaces and leave new lines? Python

Question

How to strip double spaces and leave new lines? Is it possible without re ?

If I have something like that:

string = '   foo\nbar  spam'

And I need to get:

'foo\nbar spam'

' '.join(string.split()) removes all whitespace including new lines:

>>> ' '.join(string.split())
'foo bar spam'

' '.join(string.split(' ')) do nothing.

Answer 1

>>> text = '   foo\nbar      spam'
>>> '\n'.join(' '.join(line.split()) for line in text.split('\n'))
'foo\nbar spam'

This splits it into lines. Then it splits each line by whitespace and rejoins it with single spaces. Then it rejoins the lines.

Answer 2

strip or lstrip functions can be used:

line = '   foo\nbar  spam'
while '  ' in line:
    line = line.replace('  ', ' ')
line = line.strip(' ')

Answer 3

text = [' '.join(i.split()) for i in text.split('\n') if not i.isspace()]
text = '\n'.join(text)