[Tutor] IndexError: list index out of range

[eryksun]

On Fri, Nov 29, 2013 at 8:17 PM, richard kappler <richkappler at gmail.com> wrote:
>
> args = shlex.split(cmd)
> output,error = subprocess.Popen(args,stdout = subprocess.PIPE, stderr=
> subprocess.PIPE).communicate()

Output to stderr doesn't necessarily mean a command failed. The
process returncode is what you need to inspect. Use
subprocess.check_output. It raises a subprocess.CalledProcessError for
a non-zero return code.

> if not error:
> a = eval(output)

Please post plain text to the list. Automatic conversion from rich to
plain text isn't Python friendly.

Don't use eval like this. Google isn't sending Python code in response
to a web query. They're sending JSON data:

    import json

    output = ('{"status":0,"id":"","hypotheses":'
              '[{"utterance":"Python","confidence":0.58060002}]}')

    a = json.loads(output)

    >>> a['hypotheses'][0]
    {u'confidence': 0.58060002, u'utterance': u'Python'}

    >>> a['hypotheses'][0]['utterance']
    u'Python'

Remember to check the status code. I found a short list, but nothing official:

    0 - correct
    4 - missing audio file
    5 - incorrect audio file

When the speech recognition fails to form a hypothesis, print "Ozzy,
is that you again?" ;)