On 2014-10-01, Simon King <[email protected]> wrote:
> Hi!
>
> I wonder: How does one access the fields of a record that is defined in
> libgap? If R is a record in GAP and f is one of its fields, then it can
> be accessed by R.f; however, this does not work in libgap:
>
> sage: R = libgap.eval('rec(a:=1, b:=2)')
> sage: R.RecFields() # So, creating the record did work
> [ "b", "a" ]
R is a Python dictionary.
So you just can do
R["a"]
and get 1,
etc.
> sage: R.a
> Traceback (most recent call last)
> ...
> AttributeError: name "a" is not defined in GAP.
>
> In the GAP pexpect interface, the following would work:
>
> sage: R = gap('rec(a:=1, b:=2)')
> sage: gap('{}.a'.format(R.name()))
> 1
>
> But that's awkward and moreover won't work in libgap.
>
> Best regards,
> Simon
>
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