Handling AttributeError Exception in Python list operation program

Last update on April 21 2025 13:08:28 (UTC/GMT +8 hours)

10. Handle AttributeError Exception in List Operations

Write a Python program that executes a list operation and handles an AttributeError exception if the attribute does not exist.

exception AttributeError:

Raised when an attribute reference (see Attribute references) or assignment fails. (When an object does not support attribute references or attribute assignments at all, TypeError is raised.)

Sample Solution:

Code:

# Define a function named 'test_list_operation' that takes 'nums' as a parameter.
def test_list_operation(nums):
    try:
        # Attempt to access the 'length' attribute of the 'nums' list and assign it to 'r'.
        r = len(nums)  # Trying to access the length attribute
        # Print the length of the list 'nums'.
        print("Length of the list:", r)
    except AttributeError:
        # Handle the exception if an AttributeError occurs when attempting to access the 'length' attribute.
        print("Error: The list does not have a 'length' attribute.")

# Create a list 'nums' containing integer values.
nums = [1, 2, 3, 4, 5]
# Call the 'test_list_operation' function with the 'nums' list as a parameter to check for the 'length' attribute.
test_list_operation(nums)

Output:

Length of the list: 5

Flowchart:

Code:

# Define a function named 'test_list_operation' that takes 'nums' as a parameter.
def test_list_operation(nums):
    try:
        # Attempt to access an undefined attribute 'lengtha' of the 'nums' list and assign it to 'r1'.
        r1 = nums.lengtha  # Trying to access the 'length' attribute
        # Print the result, which will not execute due to the exception.
        print("Length of the list:", r1)
    except AttributeError:
        # Handle the exception if an AttributeError occurs when attempting to access the 'lengtha' attribute.
        print("Error: The list does not have a 'lengtha' attribute.")

# Create a list 'nums' containing integer values.
nums = [1, 2, 3, 4, 5]
# Call the 'test_list_operation' function with the 'nums' list as a parameter to check for the 'lengtha' attribute.
test_list_operation(nums)

Explanation:

In the above exercise,

The "test_list_operation() function is defined, which takes a list, "nums", as a parameter.
Inside the function, we use a try block to perform the list operation. In this case, we try to access the list length using the len() function and store it in the length variable.
If the len() function is successfully executed, we print the list length.
However, if an AttributeError exception occurs because the list does not have a length attribute, the program jumps to the except block. In this block, we catch the AttributeError exception and print an error message indicating that the list does not have a length attribute.

Output:

Error: The list does not have a 'length' attribute.

Flowchart:

For more Practice: Solve these Related Problems:

Write a Python program to attempt to access a non-existent attribute of a list and catch the resulting AttributeError.
Write a Python program to implement a function that tests if a list has a specific method and raises an AttributeError if it doesn't.
Write a Python program to simulate an AttributeError by mistakenly calling a method on a non-list object, then handling the exception.
Write a Python program to use try-except to verify that a given list supports a particular attribute before performing an operation.

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