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Adding to dictionary


ameliabob

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I see many examples o dictionary used but I cannot find any that adds to an existing dictionary

	a = dict()
	a['fgh']=123
	a['ghi'] = 345
	

Yields the error

    a['ghi']=345
TypeError: 'str' object does not support item assignment

Is it only possible to build it once and not add to it??

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