python - How can I match input in a case insensitive manner? -

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i making mud, or sud can call (singleplayer) way navigate through game type commands. 

def level_01_room_01():     choice = raw_input('>: ')     if choice == 'north':         level_01_room_02()

in case, if user enters north, capital n, code not perceive command. big mess if have enter:

def level_01_room_01():     choice = raw_input('>: ')     if choice == 'north':         level_01_room_02()     if choice == 'north':         level_01_room_02()     if choice == 'north':         level_01_room_02()

etc.

is there way can fix this, player can type word or wants to?

always lower() user input before comparing against known strings (and use lower case).

if choice.lower() =='north':     ...

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