Control Flow - If statement

In the exercise for Control Flow - If statements, you have to write the code to keep Dave off your computer. When you input the name angela_catlady_87, it prints out a statement saying, “I know it’s you Dave! Go away!!” If you change the capitalization on the input to Angela_catlady_87, it no longer prints out the warning. Is there a way to output the warning, no matter how they capitalize the input? Just curious if there was an easy way to do this.

# str.lower()
# Return a copy of the string converted to lowercase.

user_name = "Angela_catlady_87"
lowercase_user_name = user_name.lower()