Handling AttributeError Exception in Python list operation program

Last update on March 29 2025 13:00:15 (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.

Python Code Editor:

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