Learn Multiple Return Values | Function Return Value Specification

Sometimes you need to return multiple objects from a function. You can do this in two ways:

Using a List or Tuple

Create a list or tuple that contains all required objects inside the function and return it as the function's result.


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# Define a function
def return_multiple_objects():
    obj1 = 'Hello'
    obj2 = 42
    obj3 = [1, 2, 3]
	# Return all objects packed into list
    return [obj1, obj2, obj3]
  
# Get the list with corresponding objects
result_list = return_multiple_objects()
for obj in result_list:
	print(obj)

You created three different objects inside the function and returned a list containing them as the function's output. Then, you iterated through this list to access each object.

Using Multiple Return Values

You can directly return multiple values separated by commas. When function is called, the results are captured in separate variables.


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def return_multiple_objects():
    obj1 = "Hello"
    obj2 = 42
    obj3 = [1, 2, 3]
	# Return objects separated by comma
    return obj1, obj2, obj3

# Get the result of the function into three different values
result1, result2, result3 = return_multiple_objects()
print(result1, result2, result3)

In the code above, you returned three variables separately. When using this approach, it is important to know the order in which the variables are returned to use them correctly in the code.

Task

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Implement a validate_registration function that validates user registration details by checking the username, email, and password. If any validation rule is not met, the function should return a list of error messages. Otherwise, it should confirm successful validation.

Define the function validate_registration, which takes three parameters: username, email, password
Initialize an empty list errors to store validation error messages.
Check if the username is at least 3 characters long. If not, add "Username must be at least 3 characters long." to the errors list.
Verify that the email contains the @ symbol. If not, add "Invalid email format." to the errors list.
Check if the password is at least 6 characters long. If not, add "Password must be at least 6 characters long." to the errors list.
Return the result of comparing the length of errors to 0 as the first parameter and the errors list as the second parameter.

Solution

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Section 4. Chapter 2

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