Python case sensetive removal : I'm making a small bot for twitch . tv and I have a small issue that I don't know how to fix it. 

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    			user = getUser(line)
    			message = getMessage(line)
    			if "Pls Work" in message.lower():
    				sendMessage(s, "Okay I will work :)")
    				break

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I don't want to put loads of different combinations for one text, so how do I make it so it converts the input into lower cases so the bot understands it? I tried to put lower() in many places but didn't seem to work. 

I am very new to python so please be easy on me :) 