syntax error in python function definitions -

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sorry if sound complete idiot when asking this, i'm new python. when create function : 

def load_content(name, colorkey=none, datatype):

it tells me there syntax error. can tell, right way write function. said, i'm new. know what's wrong here?

you can't have default arguments between non-default arguments

def load_content(name, colorkey=none, datatype=none):

or

def load_content(name, datatype, colorkey=none):

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