data size in python

pandabuiltin.py

import json
from glob import iglob
import resource

dflist = []
for i in iglob('./data/FULL/data/visits*.json'):
    print(i)
    dflist.append(json.load(open(i, 'r')))

print(resource.getrusage(resource.RUSAGE_SELF).ru_maxrss)

pandadf.py

import pandas
from glob import iglob
import resource

dflist = []
for i in iglob('./data/FULL/data/visits*.json'):
    print(i)
    dflist.append(pandas.read_json(i))

print(resource.getrusage(resource.RUSAGE_SELF).ru_maxrss)

list+dataframe uses 7410424KB
list+dict uses 4345368KB