Building Functions

Business Scenario

Welcome!

Today is your 11th day as a Junior Data Analyst at the Indian Railways Reservation Department.

Previously, you optimized the system to generate passenger records and reservation details using shorter and cleaner code.

Today, your manager wants you to improve the system further by developing reusable booking operations to organize reservation tasks for ticket booking, passenger verification, fare calculation, and ticket generation.

To complete this task successfully, you will use Python to:

  • Organize railway operations into reusable modules

  • Reduce repetitive code

  • Improve readability and maintenance

Pre-Lab Preparation

git pull origin branchName

Git Pull

Topic: Develop Booking Functions for Reservation System

1) Creating Functions & Calling Functions

2) Returning Values

         

 

A function in Python is a reusable block of code that performs a specific task.
It helps to break a program into smaller, manageable parts.
Functions can take input values (parameters) and may return a result.
They improve code readability, reusability, and organization.

1

Task 1: Create Basic Welcome Function

Define a welcome function

def welcome_message():
   print("===================================")
   print(" Indian Railways Reservation ")
   print("===================================")
   print("Welcome to Railway Reservation System")

Call the function

2

welcome_message()

Output

3

1

Task 2: Create Passenger Booking Function

Define booking function with arguments

def book_ticket(passenger_name, train_name):
   print("Passenger Name :", passenger_name)
   print("Train Name :", train_name)
   print("Reservation Status : Confirmed")

Call the booking function

2

book_ticket(
   "Rahul Sharma",
   "Rajdhani Express")

Output

3

1

Task 3: Create Fare Calculation Function

Define fare calculation function

def calculate_fare(ticket_price, passengers):
   total_amount = ticket_price * passengers
   return total_amount

Call the function

2

final_fare = calculate_fare(2450, 2)
print("Final Fare :", final_fare)

Output

3

Task 4: Create Passenger Verification Function

Call the function

2

def verify_passenger(age):
   if age >= 18:
       return "Eligible for Reservation"
   else:
       return "Not Eligible"
result = verify_passenger(25)
print(result)

Task 5: Build Ticket Generation Function

1

Create ticket generation function

Output

3

def generate_ticket(
   passenger_name,
   train_name,
   seat_number):
   print("===================================")
   print(" Railway Reservation Ticket ")
   print("===================================")
   print("Passenger Name :", passenger_name)
   print("Train Name :", train_name)
   print("Seat Number :", seat_number)

Output

3

Call the function

2

generate_ticket(
   "Priya Singh",
   "Shatabdi Express",
   "B2-21")

Task 6: Build Final Booking Function

1

Create final booking function

def final_booking_system():

   passenger_name = "Rahul Sharma"
   train_name = "Rajdhani Express"
   seat_number = "A1-12"
   ticket_price = 2450

   print("===================================")
   print(" Indian Railways Reservation ")
   print("===================================")
   print("Passenger Name :", passenger_name)
   print("Train Name :", train_name)
   print("Seat Number :", seat_number)
   print("Ticket Price :", ticket_price)
   print("Reservation Confirmed")

Call the function

2

final_booking_system()

Output

3

Save File as : booking_functions.ipynb

4

 

Great job!

You have successfully learnt how to define and call functions and return statements for booking and fare calculations to build reusable ticket booking and reservation system

 

Checkpoint

   Git Push

git push origin branchName

Next-Lab Preparation

Topic: Implement Advanced Function Techniques

1) Use default arguments
2) Variable length args
3) Recursion