Or, combining into one step...
if event.record.get('rain') is not None:
do something
On Sat, May 4, 2024 at 11:58 AM Michael Frotscher <[email protected]>
wrote:
> That did it, thanks, Frantisek!
> I now check that if 'rain' is in event.record, then check if it is
> non-Null, and if those two conditions are true, 'rain' has a valid value
> and I can use it for arithmetic.
>
> On Saturday, May 4, 2024 at 4:17:10 AM UTC-5 František Slimařík wrote:
>
>> Hello,
>>
>> event.record is dictionary. If you do event.record["rain" ] = something
>> you add new key/value into dictionary (if doesn´t exists or overwrite
>> current value). In case packet doesn´t contain no value for rain, key/value
>> pair is not added. If you do something and you are not sure if key exist in
>> dictionary you should do:
>>
>> if "rain" in event.record:
>> do_something
>>
>>
>> pá 3. 5. 2024 v 21:31 odesílatel Michael Frotscher <[email protected]>
>> napsal:
>>
>>> 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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>>>>> To view this discussion on the web visit
>>>>>> https://groups.google.com/d/msgid/weewx-development/8a2868e8-7f39-4038-acd5-c783572e2226n%40googlegroups.com
>>>>>> <https://groups.google.com/d/msgid/weewx-development/8a2868e8-7f39-4038-acd5-c783572e2226n%40googlegroups.com?utm_medium=email&utm_source=footer>
>>>>>> .
>>>>>>
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>>> .
>>>
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