IndexError in visit_AnnAssign about pyan HOT 5 CLOSED

Hi,

Hmm. Let's see if we can figure this out just by looking at the analyzer code. Since it's running the first branch of the if, at least we know that node.value is not None. Then, value = sanitize_exprs(node.value); that's a Pyan internal function, whose result should be a tuple.

It seems that for some reason, sanitize_exprs is returning an empty tuple for this particular input.

To debug further, could you modify your copy of analyzer.py, replacing the visit_AnnAssign method with the version below (there's just one added print), and then post the last thing it printed when it crashes?

    def visit_AnnAssign(self, node):  # PEP 526, Python 3.6+
        target = sanitize_exprs(node.target)
        self.last_value = None
        if node.value is not None:
            value = sanitize_exprs(node.value)
            print(id(node), value, ast.dump(node.value))  # <--- added this print here
            self.logger.debug("AnnAssign %s %s, %s:%s" % (get_ast_node_name(target[0]),
                                                          get_ast_node_name(value[0]),
                                                          self.filename, node.lineno))
            self.analyze_binding(target, value)
        else:  # just a type declaration
            self.logger.debug("AnnAssign %s <no value>, %s:%s" % (get_ast_node_name(target[0]),
                                                                  self.filename, node.lineno))
            self.last_value = None
            self.visit(target[0])
        # TODO: use the type annotation from node.annotation?
        # http://greentreesnakes.readthedocs.io/en/latest/nodes.html#AnnAssign

from pyan.

These the values returned:

140309596494816
[]
List(elts=[], ctx=Load())

from pyan.

Thanks! Now I see the problem. node.value is an empty list, so it obviously has no elements.

Since the code triggering the error is just a debug log call, I think it's safe to change the value[0] to just value. It'll sometimes produce a bit more stuff in the debug log, but that should be fine.

Could you try that and report back if it works? If so, I'll push a fix.

from pyan.

It works without the index, thanks

from pyan.

Thanks for testing! I'll push a fix.

from pyan.