python - How can I use list comprehension in following scenario? - 


for key in enron_data.keys():     if(enron_data[key]['email_address'] != 'nan'):         count += 1 print count

enron_data 2d dictionary, containing names & value,key pairs

can use len(..)

len( [v v in enron_data.values() if v['email_address'] != 'nan'] )

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