Why am I getting a Runtime.MarshalError when using this code in Zapier?

问题

The following code is giving me:

Runtime.MarshalError: Unable to marshal response: {'Yes'} is not JSON serializable

from calendar import monthrange

def time_remaining_less_than_fourteen(year, month, day):
    a_year = int(input['year'])
    b_month = int(input['month'])
    c_day = int(input['day'])
    days_in_month = monthrange(int(a_year), int(b_month))[1]
    time_remaining = ""

    if (days_in_month - c_day) < 14:
        time_remaining = "No"
        return time_remaining

    else:
        time_remaining = "Yes"
        return time_remaining


output = {time_remaining_less_than_fourteen((input['year']), (input['month']), (input['day']))}

#print(output)

When I remove {...} it then throws: 'unicode' object has no attribute 'copy'

回答1:

David here, from the Zapier Platform team.

Per the docs:

output: A dictionary or list of dictionaries that will be the "return value" of this code. You can explicitly return early if you like. This must be JSON serializable!

In your case, output is a set:

>>> output = {'Yes'}
>>> type(output)
<class 'set'>
>>> json.dumps(output)
Object of type set is not JSON serializable

To be serializable, you need a dict (which has keys and values). Change your last line to include a key and it'll work like you expect:

#         \ here /
output = {'result': time_remaining_less_than_fourteen((input['year']), (input['month']), (input['day']))}

来源：https://stackoverflow.com/questions/54407298/why-am-i-getting-a-runtime-marshalerror-when-using-this-code-in-zapier