Is there a way to traverse the atomspace using Python Bindings?

[Xabush Semrie]

I want to traverse the whole atomspace loaded using Python API. So far I have tried this:

from opencog.atomspace import types

links = atomspace.get_atoms_by_type(types.Link)
#nodes = atomspace.get_atoms_by_type(types.Node)

def traverse_atomspace(lns):
  for link in lns:
    link_arr = []
    traverse_atomspace_helper(link, link_arr)
     
def traverse_atomspace_helper(link, container):
  if len(link.out) == 0:
    return  
  for atom  in link.out:
    if len(atom.out) != 0: # it is a link by itself
      traverse_atomspace_helper(atom, container)
    else:
      print(atom)
       
traverse_atomspace(links)

This prints the all the atoms as it traverses through each link. But I was wondering if there is a better way to do it? Can we use pattern matcher functions “natively”? i.e without going through scheme_eval madness?

[Linas Vepstas]

? There is no `scheme_eval` in the snippet of code that you just posted.

You can get all atoms (links and nodes, at the same time) by saying

atomspace.get_atoms_by_type(types.Atom)

which will return both.  That way, you don't need the call to `

traverse_atomspace_helper`

There are two bugs in

traverse_atomspace_helper

One bug is that it will print many atoms more than once (potentially duplicating thousands or millions of times).   The other bug is that there are links with no outgoing sets that are perfectly valid -- e.g. (TrueLink) or the empty set (SetLink) and so on. 

You don't need the pattern matcher to "traverse the whole atomspace". the get-atoms-by-type will return all of them, without any missing, without any duplicates.

(I mean, you can write a pattern matcher query that will run on the entire atomspace, but this is usually undesirable, since .. it eats cpu time.)

--linas

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[Vitaly Bogdanov]

It depends on your goal, but the simplest way to iterate through all atoms in Python API is:

```

space = AtomSpace()

for atom in space:
    print('atom:', atom)
```

Best regards,

  Vitaly

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