comparing BASH vs. Python script

BASH SCRIPT TO remove blank and commented lines and allow to save with date time stamp:

    1  !/bin/bash
     2  ################################################################################
     3  # jm - 24 jun 2016 - cat, grep out blank lines and comments, option to save
     4  ################################################################################
     5  USAGE="catgrep filename # removed commented and blank lines, option to save"
     6  echo "$1"
     7  cat $1 | grep -E -v '(^#|^$)'
     8  echo "save info? Y,y"
     9  read answer
    10  if [ $answer = "y" ]
    11          then
    12          echo "$1"  | tee $1-content-`date +%Y%b%d-%H%M`.txt
    13          cat $1 | grep -E -v '(^#|^$)' | tee -a $1-content-`date +%Y%b%d-%H%M`.txt
    14          else
    15          echo 'thanx for using catgrep! next'
    16  fi
    17  ########################################

BASH script converted to python:
       
    18  #!/usr/bin/env python
    19  ###########################################################################
    20  # USAGE: catgrep filename
    21  # jm - 24 jun 2016 - cat, grep out blank lines and comments, option to save
    22  # mc - 09 dec 2016 - Translated from bash to python. Works on Windows, too.
    23  ###########################################################################
    24  import datetime, os, re, sys
    25  discard = re.compile('^$|^#')
       
    26  f = sys.argv[1]
       
    27  def filter(garbage_in, gospel_out = '/dev/stdout'):
    28    garbage = open(garbage_in, 'r')
    29    gospel = open(gospel_out, 'w')
    30    print >>gospel, garbage_in
    31    for line in garbage:
    32      line = line.rstrip(os.linesep)
    33      if not discard.match(line): print >>gospel, line
    34    gospel.close()
    35    garbage.close()
       
    36  filter(f)
    37  if raw_input('save info? Y,y: ') == 'y':
    38    filter(f, f + '-content-' + datetime.datetime.now().strftime('%Y%b%d-%H%M') + '.txt')      #  JUST LOOK AT THIS SYNTAX!!!!  yikes
    39  else:
    40    print 'thanx for using catgrep! next'
    41  ###########################################################################


stripping comments and blank lines and usage out to compare actual code differences:

--> more nl-nc-nl-compare-BASH-python.txt

     1       1  !/bin/bash
     2       6  echo "$1"
     3       7  cat $1 | grep -E -v '(^#|^$)'
     4       8  echo "save info? Y,y"
     5       9  read answer
     6      10  if [ $answer = "y" ]
     7      11          then
     8      12          echo "$1"  | tee $1-content-`date +%Y%b%d-%H%M`.txt
     9      13          cat $1 | grep -E -v '(^#|^$)' | tee -a $1-content-`date +%Y%b%d-%H%M`.txt
    10      14          else
    11      15          echo 'thanx for using catgrep! next'
    12      16  fi

    13         # -------------------------------------------------------------------------------

    14      18  #!/usr/bin/env python
    15      24  import datetime, os, re, sys
    16      25  discard = re.compile('^$|^#')
    17      26  f = sys.argv[1]
    18      27  def filter(garbage_in, gospel_out = '/dev/stdout'):
    19      28    garbage = open(garbage_in, 'r')
    20      29    gospel = open(gospel_out, 'w')
    21      30    print >>gospel, garbage_in
    22      31    for line in garbage:
    23      32      line = line.rstrip(os.linesep)
    24      33      if not discard.match(line): print >>gospel, line
    25      34    gospel.close()
    26      35    garbage.close()
    27      36  filter(f)
    28      37  if raw_input('save info? Y,y: ') == 'y':
    29      38    filter(f, f + '-content-' + datetime.datetime.now().strftime('%Y%b%d-%H%M') + '.txt')
    30      39  else:
    31      40    print 'thanx for using catgrep! next'