Even more unexpected, it seems I can write to those "undefined" variables,
but trying to read them gives me a Key Error.
I have created a new field in the database called "raintotal", where I want
to store the running total of the rainfall.
Trying to test this for being "None", gives:
CRITICAL __main__: **** if event.record['raintotal'] == None:
CRITICAL __main__: **** ~~~~~~~~~~~~^^^^^^^^^^^^^
CRITICAL __main__: **** KeyError: 'raintotal'
CRITICAL __main__: **** Exiting.
But if I just write to it:
event.record['raintotal'] = 12345
That ends up in the database and doesn't throw an error.
On Friday, May 3, 2024 at 2:06:22 PM UTC-5 Michael Frotscher wrote:
> Same here, 'rain' is None unless it's raining, then it'll show data. I
> haven't checked the raw packets, but in the archive table the numbers are
> all multiples of my tipping bucket size, so that all makes sense.
> That's why I added the "check for Null/None" if-clause.
> But to be populated with data, 'rain' has to be defined. And weewx crashes
> on that
> if event.record['rain'] != None:
> clause. Do I need to check for a packet? like event.package?
> On Friday, May 3, 2024 at 12:29:38 PM UTC-5 František Slimařík wrote:
>
>> I believe "rain" is specific in this case. I was checking raw packets
>> previously on my device and normally is rain "none" if it´s not raining ;)
>> So it depends what your device is sending to weewx.
>>
>> raw packet: {'dateTime': 1642794129, 'usUnits': 1, 'rain_total': 0.0,
>> 'barometer': 30.22, 'temperature_out': 28.7, 'dewpoint': 20.1,
>> 'humidity_out': 69.0, 'wind_speed': 2.6, 'wind_gust': 2.6, 'wind_dir':
>> 268.0, 'solar_radiation': 0.0, 'uv': 0.0, 'temperature_in': 70.1,
>> 'humidity_in': 51.0, 'rain': None}
>>
>> pá 3. 5. 2024 v 15:37 odesílatel Michael Frotscher <[email protected]>
>> napsal:
>>
>>> Hmm,
>>> ok, so it works for "pressure", which contains data in every archive
>>> period and is not None.
>>> I've tried to substitute that with "rain", which is what I really want.
>>> That is usually "Null/None" in the database, but gets the amount of a
>>> bucket tip added to it every time that happens.
>>> It is fed by MQTT, which publishes the bucket amount on every tip, and
>>> that works. It even sums them up correctly if several bucket tips occur in
>>> an archive period.
>>>
>>> However, trying to retrieve that with "if event.record['rain'] != None:"
>>> I get a Key Error. Meaning the variable doesn't exist. Isn't every weewx
>>> measurement in the dictionary?
>>> That happens with any measurement that's in the database but normally
>>> "Null".
>>>
>>> I've tried to define it as Null/None in the init-part of the service
>>> rain = None
>>>
>>> But still get the key error.
>>>
>>> Thanks!
>>> On Friday, May 3, 2024 at 7:30:12 AM UTC-5 Michael Frotscher wrote:
>>>
>>>> Thanks, guys!
>>>> I see my mistake now. It's not about strings/floats at all, but I
>>>> wrongly assumed that all measurements that have values assigned to them
>>>> (via LOOP or whatever) would already be defined as global variables.
>>>> That's obviously not the case, but assigning the last value to the
>>>> variable via "event.record['pressure']" (as Frantisek pointed out) is
>>>> necessary. I'm still not sure why that needs to be in single quotes,
>>>> indicating a string and not a number.
>>>> I would have expected something like "event.record(pressure)".
>>>>
>>>> I have to admit that I have not found this in any examples out there,
>>>> and not in the documentation for sure.
>>>>
>>>> But it's now doing what I want.
>>>>
>>>> On Friday, May 3, 2024 at 12:16:50 AM UTC-5 František Slimařík wrote:
>>>>
>>>>> I guess you want something like this:
>>>>>
>>>>> if event.record['pressure'] != None:
>>>>> newpressure = (event.record['pressure'] * 10)
>>>>> event.record['pb'] = newpressure
>>>>>
>>>>> Dne pátek 3. května 2024 v 3:38:01 UTC+2 uživatel Tom Keffer napsal:
>>>>>
>>>>>> On Thu, May 2, 2024 at 6:32 PM Michael Frotscher <[email protected]>
>>>>>> wrote:
>>>>>>
>>>>>>> Here's the full code of my service:
>>>>>>>
>>>>>>>
>>>>>> def new_archive_packet(self, event):
>>>>>>>
>>>>>>> if 'pressure' != None:
>>>>>>> newpressure = ('pressure' * 10)
>>>>>>> event.record['pb'] = newpressure
>>>>>>>
>>>>>>
>>>>>>
>>>>>> Strictly interpreted, you first ask whether the string "'pressure'"
>>>>>> is equal to None. It's not, so we proceed to the next statement. Now
>>>>>> you're
>>>>>> trying to multiply a string ('pressure') by 10. Surprisingly, this will
>>>>>> succeed, but likely does not give you the results you expect. The
>>>>>> variable
>>>>>> "newpressure" will actually be set to the string
>>>>>> 'pressurepressurepressurepressurepressurepressurepressurepressurepressurepressure'.
>>>>>>
>>>>>> That is, the string 'pressure' concatenated 10 times.
>>>>>>
>>>>>> You want a *variable* pressure, not the literal string 'pressure'.
>>>>>> Where will it come from?
>>>>>>
>>>>>> I would suggest taking an online Python course if this is unfamiliar
>>>>>> to you.
>>>>>>
>>>>>> -tk
>>>>>>
>>>>>>
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