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Pythonized version of kauppim's code
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| #!/usr/bin/env python | |
| import sys, csv | |
| # Checking for cli parametres | |
| if len( sys.argv ) < 4: | |
| print "Usage: %s input.csv column-label output.csv"%( sys.argv[0] ) | |
| sys.exit( 1 ) | |
| # Trying to open input file | |
| try: | |
| reader = csv.DictReader( open( sys.argv[1], 'rb' ) ) | |
| except IOError: | |
| print >>sys.stderr, "Unable to open file %s"% sys.argv[1] | |
| sys.exit( 1 ) | |
| # Grab the column key | |
| column_key = sys.argv[2] | |
| # Trying to open output file | |
| try: | |
| writer = csv.writer( open( sys.argv[3], 'wb' ) ) | |
| except IOError: | |
| print >> sys.stderr, "Cannot open file %s for writing." % sys.argv[3] | |
| # Pick all rows that contain the column key | |
| rows = [ row for row in reader if column_key in row ] | |
| # If no rows picked | |
| if len( rows ) < 1: | |
| print >>sys.stderr, "No rows / no suitable rows found!" | |
| sys.exit( 1 ) | |
| # Sort rows by value in column key column | |
| sorted_rows = sorted( rows, key = lambda x : x[ column_key ] ) | |
| # Extract lables (= approximation, just use first row keys ) | |
| labels = rows[0].keys() | |
| # Write labels as first line | |
| writer.writerow( labels ) | |
| # Go through every line in sorted rows | |
| for row in sorted_rows: | |
| # Put values in columns in the same order as labels | |
| line = [ row[ label ] for label in labels ] | |
| writer.writerow( line ) |
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