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 [EMAIL PROTECTED]blah blah
1111 [EMAIL PROTECTED]blah blah
3333 [EMAIL PROTECTED]blah blah
4444 [EMAIL PROTECTED]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 ,
To add to Danny's posting, I recently had to stream out an unknown list of values from a database, something like what you are doing. I created a class that formats the lines like you want and writes them out when the line gets close the the maximum length.
class Line:
length = 72
seperator = ', '
def __init__(self):
self.reset()
def reset(self):
self.contents = ''
def __str__(self):
return str(self.contents)
def __len__(self):
return len(self.contents)
def __add__(self, other):
o = str(other)
l = len(o)
s = len(self.seperator)
if len(self) + l + s > self.length:
self.flush()
if self.contents:
self.contents += self.seperator
self.contents += str(other)
return self
def flush(self):
if self.contents:
self._print(self.contents)
self.reset()
def _print(self, line):
print line
For your purposes, you would want to change the separator to just ','. Then you would just create an instance and add strings to it.
formatted_line = Line()
for line in input_file.readlines():
if number_match.match(line):
line = re.split(r'\s+', line)
formatted_line += line[0]
else:
formatted_line.flush() # clear anything left to print
HTH,
-Arcege
--
There's so many different worlds,
So many different suns.
And we have just one world,
But we live in different ones.
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