python: merging dictionaries by identical value of key

This question already has an answer here:

How to merge two dictionaries in a single expression? 48 answers

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What you asked for is simply enough done:

import copy
if 'career_business' in add_sal and 'career_business' in add_perc and 
      add_sal['career_business'] == add_perc['career_business']:
   add_all = copy.deepcopy( add_sal )
   add_all['percent'] = add_perc['percent']

However, your data structure seems rather odd for the kind of data you seem to have. You don't say what problem you're trying to solve with it, but your choice of a dictionary with random looking things in it seems likely to be at the root of your problems. Maybe you wanted something more like a dictionary keyed by the career name, like:

career_sal[ 'operations / logistics' ] = 75000.0

and corresponding stuff for the other pieces.

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