How to count the number of keys where the values meet a criteria in a list of dictionaries?

Question

I have a list of dictionaries (see below), and I would count the number of keys, whose values meet a specfic criteria. In this instance, I want to know the number of ‘duration’ keys, whose values are greater than 500.

{'test': [{'duration': 0,
   'is_correct': True},
  {'duration': 518,
   'is_correct': False},
  {'duration': 500,
   'is_correct': False},
  {'duration': 285,
   'is_correct': True,
  {'duration': 300,
   'is_correct': True}]}

Asked By: sos.cott

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Source

Answer 1

Simple list comprehension would do:

d = {'test': [{'duration': 0,
   'is_correct': True},
  {'duration': 518,
   'is_correct': False},
  {'duration': 500,
   'is_correct': False},
  {'duration': 285,
   'is_correct': True},
  {'duration': 300,
   'is_correct': True}]}
len([i for i in d['test'] if i['duration']>500])

Or you could use pandas:

import pandas as pd

df = pd.DataFrame(d['test'])
len(df[df['duration']>500])

Answered By: RJ Adriaansen

How to count the number of keys where the values meet a criteria in a list of dictionaries?

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