Re: [Discuss-gnuradio] PMT Oddities

[Dave NotTelling]

Here is a full example:

[code]

#!/usr/bin/python

import pmt

d = pmt.make_dict()

d = pmt.dict_add(d, pmt.intern('a'), pmt.intern('a'))

d = pmt.dict_add(d, pmt.intern('b'), pmt.intern('b'))

d = pmt.dict_add(d, pmt.intern('c'), pmt.intern('c'))

a = pmt.cons(d, pmt.make_u8vector(10, 10))

print 'dict_keys with a populated dictionary'

print pmt.dict_keys(a)

a = pmt.cons(pmt.make_dict(), pmt.make_u8vector(10, 10))

print 'dict_keys with an empty dictionary'

print pmt.dict_keys(a)

[/code]

You end up with the following output:

[output]

dict_keys with a populated dictionary

((c . c))

dict_keys with an empty dictionary

Traceback (most recent call last):

  File "test.py", line 18, in <module>

    print pmt.dict_keys(a)

  File "/usr/local/lib/python2.7/dist-packages/pmt/pmt_swig.py", line 3010, in dict_keys

    return _pmt_swig.dict_keys(dict)

RuntimeError: pmt_car: wrong_type : ()

[/output]

The first call to dict_keys(a) returns the last element in the dictionary.  The second call errors out.  Both should error out correct?

On Fri, Dec 9, 2016 at 9:11 PM, Dave NotTelling <address@hidden> wrote:

I understand that it should bomb, but it doesn't if there are elements in the dictionary of the pair generated by cons.  that's the problem.  calling dict_keys should die on both tests, but returns just fine on the first test. 

On Dec 9, 2016 1:35 PM, "Martin Braun" <address@hidden> wrote:

On 12/05/2016 01:56 PM, Dave NotTelling wrote:
> Marcus & Martin:
>
>      I tried the dict_keys() method of checking, but even that can
> fail.  Here is an example:
>
> [code]
>
> import pmt
>
> d = pmt.make_dict()
> d = pmt.dict_add(d, pmt.intern('a'), pmt.intern('a'))
> d = pmt.dict_add(d, pmt.intern('b'), pmt.intern('b'))
> d = pmt.dict_add(d, pmt.intern('c'), pmt.intern('c'))
>
> a = pmt.cons(d, pmt.make_u8vector(10, 10))
>
> print pmt.dict_keys(a)
>
> [/code]
>
> You end up with: ((c . c))
>
> The dict_keys() method will bomb if there are no elements in the dictionary:
>
> print pmt.dict_keys(pmt.cons(pmt.make_dict(), pmt.make_u8vector(10, 10)))

It's supposed to bomb -- pmt.cons() does not return a dict. That's
exactly how you can test for dicts.

See:
https://github.com/gnuradio/gnuradio/blob/1e8562c8d5430667b48fced2d2e50ab5771dfb5e/gr-uhd/lib/usrp_block_impl.cc#L486-L494

-- M

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