handy json serializer for numpy and pandas type

numpy_pandas_json_serializer.py

import numpy as np
import pandas as pd

def default_json_encoder(value):
    # This should be built-in ...
    if isinstance(value, (datetime.datetime, pd.Timestamp)):
        return value.isoformat()
    elif isinstance(value, np.bool_):
        return bool(value)
    elif isinstance(value, np.floating):
        return float(value)
    elif isinstance(value, np.integer):
        return int(value)
    elif isinstance(value, np.ndarray):
        return value.tolist()
    elif isinstance(value, set):
        return list(value)
    return value