[Tutor] Where did those spaces come from?

[Tom Tucker]

Tutor,

Good evening! The goal is to parse a simple file and grab column one. 
Then print each value horizontally separated by a comma. 
Why is Python adding a space padding between each value? Please see below. 
Thanks ahead of time.




INPUT_FILE # unwanted lines removed
################################
5555 user at bdomain.com blah blah
1111 user at cdomain.com blah blah
3333 user at adomain.com blah blah
4444 user at edomain.com blah blah


OUTPUT DESIRED
##################
5555,1111,3333,4444


SCRIPT
#########
import re

input_file = open('/tmp/file','r')
number_match = re.compile('^\d+\s+\w+\@')
for line in input_file.readlines():
if number_match.match(line):
line = re.split('\s+', line)
print line[0],
print ",",


OUTPUT GENERATED
####################
5555 , 1111 , 3333 , 4444 ,
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