Course Content

Conditional Statements in Python

1. Mastering Python if Statements

Introduction to Python if Statements Python if Statement Syntax Using Comparison Operators in Python Logical Operators in Python Operator Precedence in Python Challenge: Simplifying Fitness Tracker Logic

2. Mastering Python if-else Statements

Python if-else Statement Syntax Challenge: Tracking Step Goal Progress with if-else Statements Challenge: Debugging and Improving a Hydration Reminder Code Using Conditional Expressions in Python Challenge: Implementing a Password Checker with if-else Logic

3. Mastering Python if-elif-else Statements

Introduction to Python if-elif-else Statements Challenge: Implementing a Workout Duration Tracker with if-elif-else Challenge: Debugging and Improving Code Logic Challenge: Building a Progress Tracker Using if-elif-else Statements

Logical Operators in Python

Previously, we explored situations involving a single condition in the if statement. Now, let's delve into scenarios where we need to evaluate multiple conditions.

Nested if Statements

One approach is to use nested if statements, as demonstrated in the example:


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steps_taken = 8000
calories_burned = 300

if steps_taken >= 5000:
    if calories_burned >= 500:
        print("Excellent work! You hit your daily fitness goals.")

However, relying heavily on nested if conditions is not considered best practice. A seasoned developer would prefer to use logical operators instead of nesting conditions.

Using Logical Operators

Logical operators allow us to combine multiple conditions more efficiently.
Python language has three logical operators: not, and, or.


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steps_taken = 8000
calories_burned = 300

if steps_taken >= 5000 and calories_burned >= 500:
    print("Excellent work! You hit your daily fitness goals.")

The not Operator

not is applied to one condition and inverts its value.


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steps_taken = 0

if not steps_taken:
    print("No steps recorded yet. Time to get moving!")

Logical and

Condition with and works only if both conditions are True.


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steps_taken = 8000
calories_burned = 600
hydration_level = 2

if steps_taken >= 5000 and calories_burned >= 500 and hydration_level >= 2:
    print("Amazing! You've achieved all your fitness goals for the day.")

Logical or

Condition with or works if at least one of the two (or more) specified conditions is True.

Suppose you want to celebrate small wins. If you meet at least one of your goals, print a motivational message.


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steps_taken = 8000
calories_burned = 200
hydration_level = 2

if steps_taken >= 10000 or calories_burned >= 500 or hydration_level >= 2:
    print("Great job! You're making progress on your fitness journey.")

Here, the hydration_level meets the condition, so the if statement executes. Remember, with the or operator, only one condition needs to be True.

1. In a fitness tracker app, you want to check if a user meets their daily step goal and calorie goal. Which logical operator should you use?

2. How would you check if the user meets at least one of their fitness goals?

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Section 1. Chapter 4