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 <[email protected]> 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" <[email protected]> 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/1e8562c8d5430667b4
> 8fced2d2e50ab5771dfb5e/gr-uhd/lib/usrp_block_impl.cc#L486-L494
>
> -- M
>
> _______________________________________________
> Discuss-gnuradio mailing list
> [email protected]
> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>
>
>
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