Singular Manual: pyobject related functions

  | ### 4.28.4 pyobject related functions `attrib` list, get and set attributes (class members) of a pyobject (see attrib) Example:
        pyobject pystr = "Kublai Khan";
      ==> no pyobject support

        // Additional functionality through attrib
        attrib(pystr, "__doc__");
      ==>
        proc(attrib(pystr, "count"))("K");
      ==>    ? proc(`string`) failed
      ==>    ? expected proc(`proc`)
      ==>    ? error occurred in or before ./examples/pyobject_related_functions.si\
         ng line 5: `  proc(attrib(pystr, "count"))("K");`
      ==>    ? wrong type declaration. type 'help proc;'

        pystr."__doc__";           // <- Short notations
      ==>    ? `pyobject` . `string` failed
      ==>    ? error occurred in or before ./examples/pyobject_related_functions.si\
         ng line 7: `  pystr."__doc__";           // <- Short notations`
        pystr.count("a");          // Even shorter (if attribute's name is valid and unused)
      ==>    ? `count` is not defined
      ==>    ? error occurred in or before ./examples/pyobject_related_functions.si\
         ng line 8: `count("a");          // Even shorter (if attribute's name is \
         valid and unused)`

        python_run("def func(): return 17");
      ==>    ? `python_run` is not defined
      ==>    ? error occurred in or before ./examples/pyobject_related_functions.si\
         ng line 10: `  python_run("def func(): return 17");`
        attrib(func);
      ==> no attributes
        attrib(func, "func_name");
      ==>
        attrib(func, "func_name", "byAnyOtherName");
      ==>    ? `func` is not defined
      ==>    ? error occurred in or before ./examples/pyobject_related_functions.si\
         ng line 13: `  attrib(func, "func_name", "byAnyOtherName");`
        attrib(func, "func_name");
      ==>
  `killattrib` deletes an attribute from a pyobject (see killattrib) Example:
      LIB("pyobject.so");
      ==> no pyobject support
      python_run("def new_pyobj(): pass");
      ==>    ? `python_run` is not defined
      ==>    ? error occurred in or before ./examples/pyobject_related_functions_1.\
         sing line 2: `python_run("def new_pyobj(): pass");`
      attrib(new_pyobj, "new_attr", "something");
      ==>    ? `new_pyobj` is not defined
      ==>    ? error occurred in or before ./examples/pyobject_related_functions_1.\
         sing line 3: `attrib(new_pyobj, "new_attr", "something");`
      attrib(new_pyobj, "new_attr");
      ==>
      attrib(new_pyobj);
      ==> no attributes

      killattrib(new_pyobj, "new_attr");
      ==>    ? `new_pyobj` is not defined
      ==>    ? error occurred in or before ./examples/pyobject_related_functions_1.\
         sing line 7: `killattrib(new_pyobj, "new_attr");`
      attrib(new_pyobj);
      ==> no attributes
> `python_run` execute string-given `python` commands and import new symbols from `python` to SINGULAR's context (see python_run). `python_eval` evaluate a string-given `python` expression and return the result to SINGULAR (see python_eval). `python_import` import `python` module into SINGULAR's context (see python_import)
> 4.28.5 python_eval |  |
> 4.28.6 python_import |  |
> 4.28.7 python_run |  |

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