recview.py

#!/usr/bin/env python3

import sys
import csv
import argparse

parser = argparse.ArgumentParser(description='''This script displays the
contents of a tsv or csv file, row-by-row with column headers for each
field''')
parser.add_argument('-i', '--input', help='input file, default is stdin')
parser.add_argument('-d', '--delimiter', help='character used for delimiter;'
					'default is tab')
parser.add_argument('-z', '--zero_based', help='start numbering from zero',
					action='store_true')
parser.add_argument('-nh', '--noheader', help='no header present',
					action='store_true')

args = parser.parse_args()
infile = args.input

# See http://stackoverflow.com/questions/14207708/ioerror-errno-32-broken-pipe-python
from signal import signal, SIGPIPE, SIG_DFL
signal(SIGPIPE, SIG_DFL)

def recview():
	if not args.noheader:
		header = next(tbl)
		l = 0
		for item in header:
			if l < len(item):
				l = len(item)
		for row in tbl:
			i = z
			j = 0
			while (j < len(row) ):
				print("{:>{}} [{:3d}]: {}" .format(header[j], l, i, row[j]))
				i, j = i+1, j+1
			print('\n')
	else:
		for row in tbl:
			i = z
			j = 0
			while (j < len(row) ):
				print("[{:3d}] {}" .format(i, row[j]))
				i, j = i+1, j+1
			print('\n')


if args.delimiter:
	delim = args.delimiter
else:
	delim = '\t'

if args.zero_based:
	z = 0
else:
	z = 1

if args.input:
	with open(infile, 'r') as f:
		tbl = csv.reader(f, delimiter = delim)
		recview()
else:
	tbl = csv.reader(sys.stdin, delimiter = delim)
	recview()