[mythtv-users] services API question

[George Bingham]

Thanks Hika & Bill,

Both your inputs are very helpful!

-- George


On Thu, Feb 23, 2023 at 4:07 PM Bill Meek <keemllib at gmail.com> wrote:

> On Thursday 23 February 2023 02:14:02 PM (-06:00), George Bingham wrote:
>
> Hello List folk,
>
> This question may not be appropriate for this forum, so please redirect me
> if there's a better way to get this answered....
>
> I'm playing with some python code to get guide data similar to what
> mythweb does with the guide. Although I'm only interested in a subset of
> the full guide data.
>
> Anyway, I am using the Channel Service 'GetChannelInfoList' and am trying
> to loop my way through it to see the chanId, chanNum, CallSign.
>
> The data structures that most of these service api requests result in is
> confusing to me. How do I know what's a dictionary and what's a list? When
> it's a dictionary, how do I know what the keys are?
> Here's an example of a loop where I'm trying to traverse the results...
> This isn't part of any actual project yet, I'm just trying to understand
> how to examine and use the results of these queries...
>
>
> resp_dict=backend.send(endpoint="Channel/GetChannelInfoList?SourceID=0&StartIndex=1&Count=33&OnlyVisible=true&Details=false")
>     print ("Response from channel Info query: ", resp_dict)
>     channelInfos=resp_dict['ChannelInfoList']
>     c=0
>     for chan in channelInfos:
>         print(channelInfos[c]['ChanID'], channelInfos[c]['ChanNum'],
> channelInfos[c]['CallSign'])
>         c+=1
>
> The print command in the for loop is generating an error, "KeyError: 0"
> But I used to have the 'chan' from the for loop there and it was giving me
> an error about indices must be integers, not strings, so I'm not sure if
> it's a list or a dict or what the heck it is...
>
> How is one supposed to determine the structures of data that are returned
> by the service api calls???
>
> Thanks for any insight!!
> -- George
>
>
> Take a peek at this:
>
> #!/usr/bin/python3
>
>
>
> import json
>
> from MythTV.services_api import send as api
>
>
>
>
>
> def main():
>
>
>
>     backend = api.Send(host='localhost')
>
>
>
>     resp_dict=backend.send(endpoint="Channel/GetChannelInfoList",
>
>
> rest="SourceID=0&StartIndex=1&Count=33&OnlyVisible=true&Details=false")
>
>
>     #print(json.dumps(resp_dict, sort_keys=True, indent=4,
>
>     #                         separators=(',', ': ')))
>
>
>
>     channelInfos = resp_dict['ChannelInfoList']['ChannelInfos']
>
>
>
>     print(json.dumps(channelInfos, sort_keys=True, indent=4,
>
>                              separators=(',', ': ')))
>
>
>
>     for chan in range(0, int(resp_dict['ChannelInfoList']['Count'])):
>
>         print(channelInfos[chan]['ChanId'],
>
>               channelInfos[chan]['ChanNum'],
>
>               channelInfos[chan]['CallSign'])
>
>
>
>
>
> if __name__ == '__main__':
>
>     main()
>
>
> Note that it's ChanId, not ChanID. The json.dumps() method is helpful to
> see what's
> returned. Or, you can just send the message to a browser.
>
> Things in [] are lists. Things in {} are dictionaries. I hardcoded the
> host, your args.host is
> probably fine.
>
> --
> Bill
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