<human>:  best way to extract subset of key-value pairs from python dictionary object
<bot>: Here is some code to get items from a dictionary `bigdict` where the keys are present in `('l', 'm', 'n')`

{k: bigdict.get(k, None) for k in ('l', 'm', 'n')}

#Warning: this code generation is experimental. Please inspect the code for any bugs before executing.