Buffl

Module 2

as
by abdullah S.

Making decisions with Python: If, else, and elif


Conditional statements are essential components in Python programming that allow your code to make decisions based on specific conditions.

Understanding Conditional Statements

  • Conditional statements evaluate conditions and execute different blocks of code based on whether those conditions are true or false.

  • They transform static programs into dynamic applications that can respond to user input and varying situations.

Types of Conditional Statements

  • If Statement: Checks a condition; if true, executes the associated code block. For example, checking if an employee's sales exceed a threshold to trigger a bonus.

  • Else Statement: Provides an alternative action if the if condition is false. For instance, in a login system, it handles invalid credentials by displaying an error message.

  • Elif Statement: Allows checking multiple conditions in sequence, enabling a chain of decisions. For example, calculating shipping costs based on different order totals.

Importance of Conditional Statements

  • They enable programs to handle various scenarios, making them adaptable and responsive.

  • They are crucial for tasks like data validation, error handling, and creating personalized user experiences.

Overall, conditional statements are vital for building intelligent and interactive Python applications.

And if you want to continue exploring this topic, try one of these follow-up questions:


Example: Online Shopping Cart

Imagine you're developing an online shopping cart for a retail website. You want to calculate shipping costs based on the total amount of a customer's order. This is where conditional statements come into play!

  • If Statement: You check if the order total is above a certain amount to qualify for free shipping.

    • If the order total is $50 or more, the customer gets free shipping.

  • Else Statement: If the order total is below $50, you apply a standard shipping fee.

    • If the order total is less than $50, a shipping fee of $5 is added.

  • Elif Statement: You can also check for different shipping rates based on various order total ranges.

    • If the order total is between $30 and $50, the shipping fee is $3.

    • If the order total is below $30, the shipping fee is $5.

Here’s how this logic might look in code:


order_total = 45 # Example order total

if order_total >= 50:

shipping_cost = 0 # Free shipping

elif order_total >= 30:

hipping_cost = 3 # $3 shipping fee

else: shipping_cost = 5 # $5 shipping fee

print(f"The shipping cost is: ${shipping_cost}")


In this example:

  • The program checks the order total and determines the shipping cost based on the conditions set.

  • This allows the shopping cart to provide a tailored experience for customers, encouraging them to increase their order total for free shipping.

If you have any specific scenarios or industries in mind, feel free to share, and I can provide more tailored examples!


age = int(input("Please enter you age: "))

if age < 12:

    print ("price is 8 $")

elif age <= 64:

    print ("price is 12 $")

elif age >= 65:

    print ("price is 10 $")

Author

abdullah S.

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