Thinkful homework. Tax Calculator, version 3

gistfile1.txt

#!/usr/bin/python

from __future__ import division
import sys


welcome = """
###################################
Meal Tip calculator
###################################
"""

help = """
## how to use this tool

first input:  the cost of your meal
second input: the tip percentage
third input:  the tax rate percentage 
"""

print welcome

if len(sys.argv) != 4:
    print help
    sys.exit("you gave the wrong number of args")
    

# print help
if sys.argv[1] == "help":
    print help


# otherwise, get inputs

meal_base_cost = float(sys.argv[1])
tip_percentage = float(sys.argv[2])
tax_rate       = float(sys.argv[3])

# calculate meal cost with tax
def calculate_meal_with_tax(meal_base_cost, tax_rate):
    tax = (tax_rate / 100)
    base = meal_base_cost
    total = base + ( base * tax)
    return total

#calculate the dollar amout of the tip
def calculate_tip(meal_base_cost, tip_percentage):
    meal_base_cost = meal_base_cost
    tip_value = meal_base_cost *(tip_percentage / 100)
    return tip_value
    
def calculate_tax_cost(meal_base_cost, tax_rate):
    meal_base_cost = meal_base_cost
    tax_cost = meal_base_cost * (tax_rate / 100)
    return tax_cost
        

def calculate_meal_with_tip(meal_base_cost, tip_percentage):
    tip   = (tip_percentage / 100)
    base  = meal_base_cost
    total = base + (base * tip)
    return total

def calculate_grand_total():
    tax = calculate_tax_cost(meal_base_cost, tip_percentage)
    tip_value = calculate_tip(meal_base_cost, tip_percentage)
    total = meal_base_cost + tax + tip_value
    return total


def print_all_totals():
    with_tax  = str(calculate_meal_with_tax(meal_base_cost, tax_rate))
    with_tip  = str(calculate_meal_with_tip(meal_base_cost, tip_percentage))
    tip_value = str(calculate_tip(meal_base_cost, tip_percentage))
    tax       = str(calculate_tax_cost(meal_base_cost, tax_rate))
    total     = str(calculate_grand_total())
    print "The tax on the meal costs: $" + tax
    print "The tip value of the meal is $" + tip_value
    print "The meal with tax costs alone: $" + with_tax
    print "The meal with the tip costs alone $" + with_tip
    print "The total comes to $" + total

print_all_totals()