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Pythonic: Difference between revisions
pyobj notes
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G_struct = struct(G); # G converted to a struct | G_struct = struct(G); # G converted to a struct | ||
</syntaxhighlight>}} | </syntaxhighlight>}} | ||
==== Python Objects in Octave ==== | |||
The {{Codeline|@pyobj}} classdef class is intended to wrap arbitrary Python objects so they can be accessed an manipulated from within Octave. | |||
{{Code|avoiding garbage collection|<syntaxhighlight lang="octave" style="font-size:13px" line highlight="4"> | |||
pyexec('d = dict(one=1, two=2)') # create object in Python | |||
x = pyobj('d') # create pyobj wrapper for that object | |||
pyexec('d = []') # careful, don't lose the object to the GC | |||
x.keys() # list the keys of the dict | |||
clear x # now the object should be GCed | |||
</syntaxhighlight>}} | |||
One proposed way to do this: | |||
1. `x` stores the pointer to `d`. The `@pyobj` ctor creates a dummy reference to `d`, this prevents GC | |||
2. on deletion of x (`clear x`) we delete the dummy reference in Python. | |||
Other ideas: | |||
2. Store the `repr` as a string in `x`. This makes a copy of the object rather than a reference to the original object. | |||