picroft skill code

[monapi]

hi, this is a part of a code for picroft skill:

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def handle_command_intent(self, message):
	if message.data["command"].upper() == "BLINK":
		self.speak_dialog("ledblink")

the "data" and "command" and "speak" didn't define in the code
how does python found what data is? how about the other?

another problem that i have is in the code below:

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class iterable(object):
	def __init__(self, values):
		self.values = values
		self.location = 0

my question is why haven't location be put in the def arguments like below?

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def __init__(self, values, location):

and why a function like below should be define?

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def __iter__(self):
	return self