dynamic argument name for functions

[mark]

I want to pass a value to an argument of a function. The argument name is
dynamic and is stored in a
variable. How do I call the function using with arg_name and value as the
parameters.
thanks
mark

For ex:
def function(arg1='None', arg2='None', arg3='None'):
      print arg1
      print arg2
      print arg3


arg_name = 'arg1'
arg_value = 'i am passing a value to argument 1'
function(???????)
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