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

# Define a list and set it to 'demo_list' var
demo_list = ['a', 'b', 'c', 'd']
# Try a non-existent method on the list var (madeupmethod)
try:
    demo_list.madeupmethod()
# Handle the expected AttributeError
except AttributeError:
    # Print error message
    print('That method is not valid')