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Python Programs - Conditional Statements

Determine electricity bill category based on units consumed - Python Program

Example 1 : Basic Program

Python 
units = int(input("Enter units consumed: "))

if units <= 100:
    category = "Low"
elif units <= 300:
    category = "Medium"
else:
    category = "High"

print("Category:", category)

Output

 
OUTPUT 1 :
Enter units consumed: 125
Category: Medium 

OUTPUT 2 :
Enter units consumed: 325
Category: High

Example 2 : Advanced Program

Python 
def calculate_electricity_bill(units):
    """
    Calculates the electricity bill and determines the category based on units consumed.

    Args:
        units (int): The number of electricity units consumed.

    Returns:
        tuple: A tuple containing the bill amount (float) and the category (str).
               Returns (None, "Invalid input") if units are negative.
    """
    if units < 0:
        return None, "Invalid input: Units consumed cannot be negative."

    bill_amount = 0.0
    category = ""

    if 0 <= units <= 100:
        bill_amount = units * 3.00
        category = "Residential - Low Consumption"
    elif 101 <= units <= 300:
        bill_amount = (100 * 3.00) + ((units - 100) * 5.00)
        category = "Residential - Medium Consumption"
    elif 301 <= units <= 500:
        bill_amount = (100 * 3.00) + (200 * 5.00) + ((units - 300) * 7.50)
        category = "Residential - High Consumption"
    else:  # units > 500
        bill_amount = (100 * 3.00) + (200 * 5.00) + (200 * 7.50) + ((units - 500) * 10.00)
        category = "Commercial / Very High Consumption"

    return bill_amount, category

# Get units consumed from user
try:
    units_consumed = int(input("Enter the number of units consumed: "))
    bill, cat = calculate_electricity_bill(units_consumed)

    if bill is not None:
        print(f"\nUnits Consumed: {units_consumed}")
        print(f"Electricity Bill Category: {cat}")
        print(f"Total Electricity Bill: Rs. {bill:.2f}")
    else:
        print(cat) # Prints the error message for invalid input
except ValueError:
    print("Invalid input: Please enter a whole number for units consumed.")

Output

 
OUTPUT 1 :
Enter the number of units consumed: 325

Units Consumed: 325
Electricity Bill Category: Residential - High Consumption
Total Electricity Bill: Rs. 1487.50 

OUTPUT 2 :
Enter the number of units consumed: 125

Units Consumed: 125
Electricity Bill Category: Residential - Medium Consumption
Total Electricity Bill: Rs. 425.00

OUTPUT 3 :
Enter the number of units consumed: 75

Units Consumed: 75
Electricity Bill Category: Residential - Low Consumption
Total Electricity Bill: Rs. 225.00

Explanation

calculate_electricity_bill(units) Function:

  • This function takes an integer unitsrepresenting the electricity units consumed as input.
  • It first checks if the input unitsare negative; if so, it returns an error message.
  • It then uses a series of if-elif-elsestatements to determine the electricity bill category and calculate the bill amount based on predefined tiers and rates:
    • 0-100 units:Charged at Rs. 3.00 per unit. Category: "Residential - Low Consumption".
    • 101-300 units:First 100 units at Rs. 3.00, remaining at Rs. 5.00 per unit. Category: "Residential - Medium Consumption".
    • 301-500 units:First 100 units at Rs. 3.00, next 200 at Rs. 5.00, remaining at Rs. 7.50 per unit. Category: "Residential - High Consumption".
    • Above 500 units:Rates apply progressively, with units above 500 charged at Rs. 10.00 per unit. Category: "Commercial / Very High Consumption".
  • The function returns a tuple containing the calculated bill_amountand the determined category.

User Input and Output:

  • The program prompts the user to enter the units_consumed.
  • It uses a try-exceptblock to handle potential ValueError if the user enters non-integer input.
  • It calls the calculate_electricity_billfunction to get the bill and category.
  • Finally, it prints the units consumed, the determined electricity bill category, and the total electricity bill amount, formatted to two decimal places.
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