Try using pandas.DataFrame

A system with a lot of json data

a = [{"poko": 1, "hoge":2}, {"poko": 1, "hoge":2}, {"hoge":2}, {"poko": 1}]

from pandas import DataFrame
frame = DataFrame(a)

When I output frame with ipython

Out:
   hoge  poko
0     2     1
1     2     1
2     2   NaN
3   NaN     1

Typical

In: frame[“poko”]
Out: 
0     1
1     1
2   NaN
3     1
Name: poko, dtype: float64

In: frame[“poko”][:2]
Out: 
0    1
1    1
Name: poko, dtype: float64

When you want a count up

In: frame["poko"].value_counts()
Out:
1    3
dtype: int64

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