new_contents: #! /usr/bin/env python
  # multiplication_table.py -- Creates a multiplication table in excel
  
  import sys
  import openpyxl
  from openpyxl.styles import Font
  
  # A program that takes a number N from the command line
  # and creates an NxN multiplication table in an Excel spreadsheet.
  try:
      usr_input = int(sys.argv[1])
  except ValueError:
      print "Usage: multiplication_table.py [number]"
      print "[number] means an integer only."
      sys.exit()
  
  
  # Create a workbook
  work_book = openpyxl.Workbook()
  
  # Create worksheet
  sheet = work_book.active
  
  # Create header row
  sheet.cell(row=1, column=1).value = ''
  for header_column in range(1, usr_input + 1):
      sheet.cell(row=1, column=header_column + 1).value = header_column
  
  # Create side column
  for side_column in range(1, usr_input + 1):
      sheet.cell(row=side_column + 1, column=1).value = side_column
  
  # Make header row and side column bold
  bold12font = Font(size=12, bold=True)
  for row in range(1, usr_input + 1):
      sheet.cell(row=row + 1, column=1).font = bold12font  # cell A1 is blank
  for column in range(1, usr_input + 1):
      sheet.cell(row=1, column=column + 1).font = bold12font
  
  # Create multiplication-table rows and columns.
  for row_num in range(1, usr_input + 1):
      for column_ in range(1, usr_input + 1):
          sheet.cell(
              row=row_num + 1, column=column_ + 1).value = column_ * row_num
  
  work_book.save('mult_table.xlsx')
subject: Create Multiplication table in Excel