TypeError: Object of type function is not JSON serializable

Question

I currently struggle to understand why the following code is not working:

import json
import random

def _time_series_prc(start_date, count, periodicity, is_history=True):
    values = []

    print(type(start_date))
    print(type(periodicity))

    for i in range(count - 1):
        value = random.uniform(0, 1)
        values.append(value)

    return _build_series(values, start_date, periodicity, is_history)


def _build_series(values, start_date, periodicity, is_history):
    if is_history:
        values.reverse()

    return {
        'periodicity': periodicity,
        'startDate': start_date,
        'values': values,
    }

result = _time_series_prc('2019-07-17', 52, 'WEEKLY')

print(json.dumps(result, indent=4));

output:

<class 'str'>
<class 'str'>
TypeError: Object of type function is not JSON serializable

At line 7, the json.dumps I get the error: TypeError: Object of type function is not JSON serializable`. Im not using ptyhon very long But I cant understand how this can be a function pointer instead of the returned value.

We need to see start_date and periodicity ... and their types: print(type(start_date)) and print(type(periodicity)). You could be failing to call a function like: periodicity() or start_date(). If you are actually trying to serialize a function for later use, consider pickle instead of json — JacobIRR
– JacobIRR, Commented Jul 18, 2019 at 5:50
something in your return value from build_series is a function. possibly periodicity. — njzk2
– njzk2, Commented Jul 18, 2019 at 5:51

mtj92 · Accepted Answer · 2019-07-18 06:08:05Z

2

Your code works for me on Python 3.7.3.

Also note that for i in range(count - 1): is going to give you 51 results instead of 52 in this case (print(len(result['values']))). Also try removing the ; in your last line of code just in case :)

answered Jul 18, 2019 at 6:08

mtj92

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jtlz2 Over a year ago

;s rock.......

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