Hi, I often have this pattern in Python:
```
for vertex in mygraph.vertices():
if not mygraph.vp.is_foo[vertex]:
continue
do_stuff_that_uses_all_vertices()
```
`is_foo` is a boolean property.
I know that there a vertex filters and GraphViews but in the loop body I
need access to all vertices. Only the iterator should be filtered.
Is there a way to specify a vertex filter only in the vertices iterator?
Something like:
```
for vertex in mygraph.vertices(vfilt=mygraph.vp.is_foo):
do_stuff_that_uses_all_vertices()
```
Of course, this would be nice in all iterators (edges(), out_edges(),
...) ;).
Best,
Gerion
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