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vatd.py
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73 lines (60 loc) · 2.1 KB
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"""Simple tool for removing the amount of UK VAT applied to a total receipt.
Over-engineered to explore Python's ArgParse library."""
import argparse
import sys
def get_options(args):
"""Returns an argparse dictionary object with application version
number, total value, value_added-tax rate and verbosity attributes."""
parser = argparse.ArgumentParser(
prog='VATDeductor',
description='Displays the VAT deductable from a total receipt value')
parser.add_argument(
'--version',
action='version',
version='%(prog)s 1.1')
parser.add_argument(
'--rate',
type=float,
action='store',
nargs='?',
default='1.2',
help='enter VAT rate as a decimal. Default is 1.2')
parser.add_argument(
'--verbose',
action='store_true',
help='displays Total Amount, VAT deductable & pretax values')
parser.add_argument(
'total',
metavar='T',
type=float,
action='store',
help='amount of TOTAL receipt value for processing')
return vars(parser.parse_args())
def calculate_net(options):
"""Calculates the receipt value without the addition of VAT applied."""
total_value = options['total']
vat_rate = options['rate']
net_value = round(total_value / vat_rate, 2)
return net_value
def calculate_refund(options):
"""Calculates total receipt minus the net, rounded to 2 decimal places.
The returned value is the VAT deductable."""
refund_value = round(options['total'] - calculate_net(options), 2)
return refund_value
def verbosity(options):
"""Presents calculation values in a cleaner but more verbose manner."""
template = f"""
************************
Total Receipt: £{options['total']}
Net Value: £{calculate_net(options)}
Deductable VAT: £{calculate_refund(options)}
************************"""
return template
def main(args):
options = get_options(args)
if options['verbose']:
print(verbosity(options))
else:
print(calculate_refund(options))
if __name__ == "__main__":
main(sys.argv[1:])