Large excel file row excerpt utility

excel.py

#!/usr/bin/env python

# This program takes two arguments, the input filename and the output filename.
# Both should be .xlsx files.
# It will then only copy each 50th row from the input to the output file.

skip = 50;

from openpyxl import load_workbook, Workbook
import sys

if len(sys.argv) < 3:
    print("read and write filename required!")
    quit()

rb = load_workbook(filename = sys.argv[1], read_only = True)
wb = Workbook(write_only = True)

print("Reading from sheet {}...".format(rb.sheetnames[0]))

rs = rb[rb.sheetnames[0]]
ws = wb.create_sheet()

count = skip - 1 # Ensure first row is copied

print("Iterating data...")
for row in rs.iter_rows():
    count += 1
    if count >= skip:
        count = 0
        thisrow = []
        for col in row:
            thisrow.append(col.value)
        ws.append(thisrow)

print("Writing to file {}...".format(sys.argv[2]))
wb.save(sys.argv[2])