CODEWITHSUNDEEP
pythonjson
bbartling
bbartling

Reputation: 3504

Don't understand cause of this json JSONDecodeError

Can anyone give me a newb tip on loading a json file into Python?

If I use:

import json

config_file = "./setpoints.json"
hvac_setpoints = json.loads(config_file)

print(hvac_setpoints)

On this setpoints.json file:

{ "setpoint": {
"ahu_static_sp_start": 0.75,
"ahu_static_sp_min": 0.15,
"ahu_static_sp_max": 1.5,
"static_sp_trim": -0.04,
"static_sp_increase": 0.06,
"time_delay_startup": 300,
"time_delay_normal": 120,
"vav_ignore_requests": 1,
"num_of_vav_above_hi_dpr_stp": 2,
"high_vav_dpr_stp": 90}
}

I'll get an JSONDecodeError: Expecting value: line 1 column 1 (char 0) in Python:

~\Anaconda\lib\json\decoder.py in decode(self, s, _w)
    335 
    336         """
--> 337         obj, end = self.raw_decode(s, idx=_w(s, 0).end())
    338         end = _w(s, end).end()
    339         if end != len(s):

~\Anaconda\lib\json\decoder.py in raw_decode(self, s, idx)
    353             obj, end = self.scan_once(s, idx)
    354         except StopIteration as err:
--> 355             raise JSONDecodeError("Expecting value", s, err.value) from None
    356         return obj, end

JSONDecodeError: Expecting value: line 1 column 1 (char 0)

Upvotes: 0

Views: 62

Answers (1)

Chris Reed
Chris Reed

Reputation: 190

I like to use a structure as follows

with open("setpoints.json", 'r') as file:
    hvac_setpoints = json.load(file)

Upvotes: 2

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