capture / save data to a txt file

I would like to periodically save a device's data to a file. In particular, I would like to record the temperature measured by a device by running a python script every 15 minutes.
I have one line, but don't know where to go next, - and my one line is probably defective.
I'd be very grateful for a suggestion as to the proper coding.
Thanks,
Bob

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data.rtf = open('mac_HD ▸ Users ▸ myName ▸ OneDrive ▸ Documents', 'w')

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dev = indigo.devices[1909647006]
data = dev.states['temperature']

with open('/Users/Dave/Downloads/file.txt', 'a') as outfile:
    output = u"{0}, {1}\n".format(indigo.server.getTime(), data)
    outfile.write(output)


You'll need to change the device ID number, the device state name (maybe), and the path to the file.

EDIT: MAY have to change the state name.

Thanks.
Curious - what does "u"{0}, {1}\n" do?

That converts all the data to a Unicode string. That will (at least theoretically) handle all kinds of fancy characters and codes--like degree symbols and such.

https://pyformat.info

and {0} & {1} refer to time and data respectively? and "\n" is ?

That's right. The '/n' is the new line character. This ensures that the next entry will start on the subsequent line.

very cool. thanks.

No problem whatsoever. This is essentially what the Matplotlib plugin CSV Engine device does.

When I test the script below, the file date is changing, but there are no data. Does there need to be a save command?

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dev = indigo.devices[883519697]
data = dev.states['state']

with open('/Users/rss/OneDrive/Documents/GBK/G lRm Temp Data.rtf', 'a') as outfile:
    output = u"{0}, {1}\n".format(indigo.server.getTime(), data)
    outfile.write(output)

It's likely that the state is not called 'state'. It's likely called 'temperature' or something similar. (That's also why I edited my post to say that you *may* have to change the state name.)

If you can't figure out the right name, we have more tools at our disposal.

'state' is the name I used to get the temperature with better email. I have forgotten how I came to that, but I suspect you may have helped.

Hah! Run this, and let's look at the states.

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dev = indigo.devices[1909647006]
data = dev.states
indigo.server.log(u"{}".format(data))


lastUpdate : 2021-01-12 14:53:01 (string)
state : 6.2 (real)
temperature : 6.2 (real)

That's curious. Maybe 'real'?
Thinking ahead, instead of '\n', getting a pair of CSV values on one line might be more useful.

Real is the type of value that the state contains. What we want is the name of the state. Try this and see what you get:

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dev = indigo.devices[883519697]
data = dev.states['temperature']

with open('/Users/rss/OneDrive/Documents/GBK/G lRm Temp Data.rtf', 'a') as outfile:
    output = u"{0}, {1}\n".format(indigo.server.getTime(), data)
    outfile.write(output)


The output will be a time stamp and the temperature value. If that's not what you want, we can work on the final format once we know it's logging properly.

the only change I made was substituting "temperature' for 'state'.
No change in result - file date is updated, but actual document is blank.