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Regex: Perl to Python

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Hi, I'm trying to move away from Perl and go to Python.
Regex seems to bethe hardest challenge so far.

Perl:

while (<HEADERFILE>) {
     if (/(\d+)\t(.+)$/) {
	print $1." - ". $2."\n";
     }
}

into python

pattern = re.compile(r"(\d+)\t(.+)$")
with open(fields_Indexfile,mode="rt",encoding='utf-8') as headerfile:
     for line in headerfile:
         #sys.stdout.write(line)
         m = pattern.match(line)
         print(m.group(0))
     headerfile.close()

but I must be getting something fundamentally wrong because:

Traceback (most recent call last):
   File "./slicer.py", line 30, in <module>
     print(m.group(0))
AttributeError: 'NoneType' object has no attribute 'group'


  why is 'm' a None?

the input data has this format:

          :
      3	prop1
      4	prop2
      5	prop3

Thanks

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Thread

Regex: Perl to Python Fillmore <fillmore_remove@hotmail.com> - 2016-03-06 23:38 -0500
  Re: Regex: Perl to Python Chris Angelico <rosuav@gmail.com> - 2016-03-07 15:45 +1100
  Re: Regex: Perl to Python Terry Reedy <tjreedy@udel.edu> - 2016-03-06 23:48 -0500
    Re: Regex: Perl to Python Rustom Mody <rustompmody@gmail.com> - 2016-03-06 21:53 -0800
    Re: Regex: Perl to Python Rustom Mody <rustompmody@gmail.com> - 2016-03-06 21:53 -0800
  Re: Regex: Perl to Python Peter Otten <__peter__@web.de> - 2016-03-07 08:48 +0100
  Re: Regex: Perl to Python Fillmore <fillmore_remove@hotmail.com> - 2016-03-07 07:50 -0500

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