flatten () 는 다차원 그룹을 1차원 그룹으로 바꿉니다

pd.value_counts(df.values.flatten())

clean[column_name].value_counts()

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# bug
from pandas import Series, DataFrame
import pandas as pd
import json

nan=float('NaN')
data = []
with open('file.json') as f:
    for line in f:
        data.append(json.loads(line))

df = DataFrame(data, columns=['accepted', 'user', 'object', 'response'])
clean = df.replace('NULL', nan)
clean = clean.dropna()
print(clean.value_counts())

#value_counts Series DataFrame （ DataFrame clean）。 ：
pd.value_counts(df.values.flatten())
#value_counts 。
clean[column_name].value_counts()