This is an endeavor from my side to demonstrate how easy to grasp language Python is. Targeted for developers with some knowledge of programming.
Real Time Use Case - Food Order & Billing
Check booking data for availability of tables in a restaurant, takes the customer order and generates the bill to the customer and finally gets the rating of the service from the customer
Key Features covered in the program
§ Classes / Objects
§ Docstrings
§ File Handling
§ Error and Exception Handling
§ Data Structures – Dictionaries
§ lambda Function
§ String Manipulation
Imports from Standard Library
Classes & Objects
Docstrings
Read File
Exception Handling
Dictionaries
lambda Function
String Manipulation
Source Code
# Imports from standard library
import datetime
import time
import sys
print("WELCOME TO QUICKCONNECT HUB")
class Restaurant:
order = {}
total = 0.0
tax = 0.04
def __init__(self):
""" Read / Display restaurant table booking information stored in a file """
print("\n" "Displaying Table Booking Data ...." "\n")
time.sleep(2)
try:
with open("table.txt","r") as tabfile:
for line in tabfile:
print(line)
time.sleep(2)
print("\n" "Please occupy empty table")
time.sleep(2)
except FileNotFoundError:
print("The data file is missing")
sys.exit()
def menuDisplay(self):
""" Display the items in the menu for selection """
print("\n" "Select the items from menu")
print("\n" "********** MENU CARD **********")
print("ITEM \t\t PRICE")
self.menu = {"Burger":120, "Pizza":200, "Hotdog":150,
"Parata":50, "Donut":80, "Nugget":50,
"Paneer":120, "Pakora":80, "Coffee":25}
for k,v in self.menu.items():
print(k,":", "\t", "Rs",v)
def orderConfirm(self):
""" Take the order and display the items for confirmation """
print("\n" "Please let us know the order")
time.sleep(2)
for i in range(len(self.menu)):
self.select_item = input("\n" "Select an Item: ")
if self.select_item not in self.menu:
print("Selected item is not available in the menu")
self.select_item = input("Please re-enter an item: ")
try:
self.quantity = int(input("Enter the Quantity: "))
self.order[self.select_item] = self.quantity
except Exception:
print("Quantity to be entered as Numeric")
self.quantity = int(input("Please re-enter the Quantity:"))
self.order[self.select_item] = self.quantity
self.item_flag = input("\n" "Do you wish to continue?(Y/N)")
if self.item_flag == "N":
break
print("\n" "Please confirm the order given:")
print(self.order)
print("\n" "THANK YOU! Please wait while we get your items")
time.sleep(2)
print("\n" "Here you go, Please have your order")
time.sleep(2)
def billGeneration(self):
""" Generates bill for the ordered items """
print("\n" "Generating Bill....")
time.sleep(2)
print("------------------------------------------")
current_time = datetime.datetime.now()
print("Invoice Generated On:", current_time.strftime("%Y-%m-%d %H:%M:%S"))
print("------------------------------------------")
for key in self.menu.keys():
if key in self.order:
print(key, "\t", "Qty", self.order[key], "\t", "Rs", self.menu[key] * self.order[key])
self.cost_item = self.menu[key] * self.order[key]
self.total += self.cost_item
self.taxamt = lambda amt, tax : amt * tax
print("------------------------------------------")
print("TOTAL:", "\t", "\t", "Rs", self.total)
print("GST 4%", "\t", "\t", "Rs", self.taxamt(self.total, self.tax))
print("------------------------------------------")
self.total += self.taxamt(self.total, self.tax)
print("GRAND TOTAL:", "\t", "Rs", self.total)
print("------------------------------------------")
def rateService(self):
""" Display customer ratings of the services provided """
print("\n" "Dear customer, Please Rate our Service * * * * * ")
rating = input("\n" "Please key-in the Stars : ")
rating = rating.replace(" ","")
if rating == "*":
print("Service Rated is:", rating, " TERRIBLE")
elif rating == "**":
print("Service Rated is:", rating, " BAD")
elif rating == "***":
print("Service Rated is:", rating, " OK")
elif rating == "****":
print("Service Rated is:", rating, " GOOD")
elif rating == "*****":
print("Service Rated is:", rating, " EXCELLENT")
print("\n" "THANK YOU! PLEASE VISIT AGAIN....")
#Main Program
res = Restaurant()
res.menuDisplay()
res.orderConfirm()
res.billGeneration()
res.rateService()
Table Data File
Output
I really hope the above walk-through help in getting view of python programming.
