Learn Return Value | What is a Function in Python?

Let's create a function walk_the_dog that takes the dog's name dog_name and the time for a walk walk_time as parameters. The function should return a message indicating whether it's time to walk the dog.


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def walk_the_dog(dog_name, walk_time):
    # Check if the walk time is between 6 and 18 hours
    if 6 <= walk_time <= 18:
        return f"Time to walk {dog_name}!"
    else:
        return f"Wait until 6 PM to walk {dog_name}!"

# Function calls with different parameters
message1 = walk_the_dog("Bella", 14)
message2 = walk_the_dog("Charlie", 20)

# Display the results
print(message1)
print(message2)

The if 6 <= walk_time <= 18: condition checks if the walk time (walk_time) is between 6 and 18 hours (inclusive).
If this condition is true (meaning the walk time is between 6 and 18 hours), the first code block is executed:
```
return f"Time to walk {dog_name}!"
```
This return statement returns a string indicating that it's time for a walk for the dog named dog_name.
If the condition is not true (meaning the walk time is not between 6 and 18 hours), the second code block is executed:
```
return f"Wait until 6 PM to walk {dog_name}!"
```
In this case, the return statement returns a different message indicating that it's necessary to wait until 6 PM for the dog named dog_name to go for a walk.

The return in this case specifies what result is returned from the function based on the condition. The function returns a string, which is then printed using print(message1) and print(message2).

It's crucial to emphasize that the return statement not only specifies the result to be returned but also immediately terminates the execution of the function. Once a return statement is encountered, the function exits, and any subsequent code within the function is not executed.

Task

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Write a function describe_dog that accepts a dog's name, breed, and age as arguments. Based on the age, the function should return a description:

If the age is less than 0, return: "Invalid age for {name}. Age cannot be negative.".
If the age is 0, return: "{name} is a newborn {breed}. A bundle of joy!".
If the age is 1, return: "{name} is a 1-year-old {breed}. A great companion!".
If the age is greater than 1, return: "{name} is a {age}-year-old {breed}. An old dog with much wisdom!".

Solution

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Section 1. Chapter 4

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              1234567891011121314
            
def walk_the_dog(dog_name, walk_time):
    # Check if the walk time is between 6 and 18 hours
    if 6 <= walk_time <= 18:
        return f"Time to walk {dog_name}!"
    else:
        return f"Wait until 6 PM to walk {dog_name}!"

# Function calls with different parameters
message1 = walk_the_dog("Bella", 14)
message2 = walk_the_dog("Charlie", 20)

# Display the results
print(message1)
print(message2)

The if 6 <= walk_time <= 18: condition checks if the walk time (walk_time) is between 6 and 18 hours (inclusive).
If this condition is true (meaning the walk time is between 6 and 18 hours), the first code block is executed:
```
return f"Time to walk {dog_name}!"
```
This return statement returns a string indicating that it's time for a walk for the dog named dog_name.
If the condition is not true (meaning the walk time is not between 6 and 18 hours), the second code block is executed:
```
return f"Wait until 6 PM to walk {dog_name}!"
```
In this case, the return statement returns a different message indicating that it's necessary to wait until 6 PM for the dog named dog_name to go for a walk.