Operator Precedence in Python
When developing a Python application, it's important to understand how Python handles operator precedence, which determines the order in which operations are performed in expressions. This ensures that conditions are evaluated correctly. Using parentheses can also help clarify and control the order of operations.
Logical Operator Precedence
Among logical operators, Python follows this precedence:
Example: Fitness Tracker Goals
Let's clarify with examples in the context of a Fitness Tracker:
12345678910111213141516171819# Example 1: AND has higher precedence than OR steps_taken = 8000 step_goal = 10000 calories_burned = 450 calorie_goal = 500 first_result = steps_taken >= step_goal or calories_burned >= calorie_goal and False # Same as: steps_taken >= step_goal or (calories_burned >= calorie_goal and False) # Example 2: Parentheses change the precedence second_result = (steps_taken >= step_goal or calories_burned >= calorie_goal) and False # Example 3: NOT has the highest precedence third_result = not (steps_taken >= step_goal) or calories_burned >= calorie_goal # Same as: (not (steps_taken >= step_goal)) or (calories_burned >= calorie_goal) print('The first expression is:', first_result) print('The second expression is:', second_result) print('The third expression is:', third_result)
Just like logical operators, other operators such as comparison operators(>=, <=, ==, etc.) and mathematical operators (+, -, *, /, etc.) also follow a specific order of precedence.
For example:
- Mathematical operators like
*and/have higher precedence than+and-; - Comparison operators (
<,>,==, etc.) are evaluated after mathematical operations; - Logical operators (
not,and,or) are evaluated last.
Using parentheses ( ) can help clarify and control the order of evaluation in your expressions.
Swipe to start coding
In the current Fitness Tracker code, multiple nested if statements make the logic harder to read and maintain. Your task is to rewrite the code using a single, concise if statement with logical operators. Use the and logical operator to combine multiple conditions.
Fitness goals should be tracked efficiently, and so should your code! The current implementation checks if:
- The user hasn't met their step goal.
- The user hasn't burned enough calories.
- The user didn't exercise in the morning.
Rewrite the code to improve its readability while keeping the same logic.
Solution
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When developing a Python application, it's important to understand how Python handles operator precedence, which determines the order in which operations are performed in expressions. This ensures that conditions are evaluated correctly. Using parentheses can also help clarify and control the order of operations.
Logical Operator Precedence
Among logical operators, Python follows this precedence:
Example: Fitness Tracker Goals
Let's clarify with examples in the context of a Fitness Tracker:
12345678910111213141516171819# Example 1: AND has higher precedence than OR steps_taken = 8000 step_goal = 10000 calories_burned = 450 calorie_goal = 500 first_result = steps_taken >= step_goal or calories_burned >= calorie_goal and False # Same as: steps_taken >= step_goal or (calories_burned >= calorie_goal and False) # Example 2: Parentheses change the precedence second_result = (steps_taken >= step_goal or calories_burned >= calorie_goal) and False # Example 3: NOT has the highest precedence third_result = not (steps_taken >= step_goal) or calories_burned >= calorie_goal # Same as: (not (steps_taken >= step_goal)) or (calories_burned >= calorie_goal) print('The first expression is:', first_result) print('The second expression is:', second_result) print('The third expression is:', third_result)
Just like logical operators, other operators such as comparison operators(>=, <=, ==, etc.) and mathematical operators (+, -, *, /, etc.) also follow a specific order of precedence.
For example:
- Mathematical operators like
*and/have higher precedence than+and-; - Comparison operators (
<,>,==, etc.) are evaluated after mathematical operations; - Logical operators (
not,and,or) are evaluated last.
Using parentheses ( ) can help clarify and control the order of evaluation in your expressions.
Swipe to start coding
In the current Fitness Tracker code, multiple nested if statements make the logic harder to read and maintain. Your task is to rewrite the code using a single, concise if statement with logical operators. Use the and logical operator to combine multiple conditions.
Fitness goals should be tracked efficiently, and so should your code! The current implementation checks if:
- The user hasn't met their step goal.
- The user hasn't burned enough calories.
- The user didn't exercise in the morning.
Rewrite the code to improve its readability while keeping the same logic.
Solution
Switch to desktop for real-world practiceContinue from where you are using one of the options belowThanks for your feedback!
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