"Python Cookbook" "Data Structure and algorithm" 16. Extracting subsets from a dictionary

Problem: Want to create a dictionary, which is itself a subset of another dictionary

Solution: Use dictionary derivation (dictionary comprehension) to easily solve

#example of extracting a subset from a dictionary fromPprintImportpprintprices= {   'ACME': 45.23,   'AAPL': 612.78,   'IBM': 205.55,   'HPQ': 37.20,   'FB': 10.75}#Make A dictionary of pricesP1 = {Key:value forKey, ValueinchPrices.items ()ifValue > 200 }Print("All prices") Pprint (p1)#Make A dictionary of tech stocksTech_names = {'AAPL','IBM','HPQ','MSFT'}P2= {Key:value forKey,valueinchPrices.items ()ifKeyinchTech_names}Print("All Techs") Pprint (p2)

>>> ================================ RESTART ================================>>>200 {'AAPL'IBM': 205.55}all techs{'  AAPL'HPQ'IBM': 205.55}

The dictionary-derived scheme is clear and fast to run.

"Python Cookbook" "Data Structure and algorithm" 16. Extracting subsets from a dictionary