Issue46078
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Created on 2021-12-15 02:37 by samuelmarks, last changed 2022-04-11 14:59 by admin. This issue is now closed.
Messages (3) | |||
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msg408580 - (view) | Author: Samuel Marks (samuelmarks) * | Date: 2021-12-15 02:37 | |
astor fails with: ``` File "python3.8/site-packages/astor/code_gen.py", line 63, in to_source generator.visit(node) File "python3.8/site-packages/astor/node_util.py", line 143, in visit return visitor(node) File "python3.8/site-packages/astor/code_gen.py", line 878, in visit_Module self.write(*node.body) File "python3.8/site-packages/astor/code_gen.py", line 178, in write visit(item) File "python3.8/site-packages/astor/node_util.py", line 143, in visit return visitor(node) File "python3.8/site-packages/astor/code_gen.py", line 364, in visit_ClassDef self.body(node.body) File "python3.8/site-packages/astor/code_gen.py", line 226, in body self.write(*statements) File "python3.8/site-packages/astor/code_gen.py", line 178, in write visit(item) File "python3.8/site-packages/astor/node_util.py", line 143, in visit return visitor(node) File "python3.8/site-packages/astor/code_gen.py", line 293, in visit_Assign self.visit(node.value) File "python3.8/site-packages/astor/node_util.py", line 143, in visit return visitor(node) File "python3.8/site-packages/astor/node_util.py", line 137, in abort_visit raise AttributeError(msg % node.__class__.__name__) AttributeError: No defined handler for node of type NoneType ``` Whereas the now builtin to Python (3.9+) `ast.unparse` gives: ``` File "3.10/lib/python3.10/ast.py", line 1673, in unparse return unparser.visit(ast_obj) File "3.10/lib/python3.10/ast.py", line 807, in visit self.traverse(node) File "3.10/lib/python3.10/ast.py", line 798, in traverse super().visit(node) File "3.10/lib/python3.10/ast.py", line 410, in visit return visitor(node) File "3.10/lib/python3.10/ast.py", line 822, in visit_Module self._write_docstring_and_traverse_body(node) File "3.10/lib/python3.10/ast.py", line 815, in _write_docstring_and_traverse_body self.traverse(node.body) File "3.10/lib/python3.10/ast.py", line 796, in traverse self.traverse(item) File "3.10/lib/python3.10/ast.py", line 798, in traverse super().visit(node) File "3.10/lib/python3.10/ast.py", line 410, in visit return visitor(node) File "3.10/lib/python3.10/ast.py", line 1001, in visit_ClassDef self._write_docstring_and_traverse_body(node) File "3.10/lib/python3.10/ast.py", line 815, in _write_docstring_and_traverse_body self.traverse(node.body) File "3.10/lib/python3.10/ast.py", line 796, in traverse self.traverse(item) File "3.10/lib/python3.10/ast.py", line 798, in traverse super().visit(node) File "3.10/lib/python3.10/ast.py", line 410, in visit return visitor(node) File "3.10/lib/python3.10/ast.py", line 863, in visit_Assign self.traverse(node.value) File "3.10/lib/python3.10/ast.py", line 798, in traverse super().visit(node) File "3.10/lib/python3.10/ast.py", line 410, in visit return visitor(node) File "3.10/lib/python3.10/ast.py", line 414, in generic_visit for field, value in iter_fields(node): File "3.10/lib/python3.10/ast.py", line 252, in iter_fields for field in node._fields: AttributeError: 'NoneType' object has no attribute '_fields' ``` Found it when I tried to unparse previously parsed: ```py class C: i: int ``` Found in reality when trying to parse then emit: - https://github.com/tensorflow/tensorflow/blob/ba146843/tensorflow/compiler/xla/python/xla_client.py#L402-L413 Which is creating this: ``` ast.Assign(targets=[ast.Name(id="interior_padding")], type_comment="int", value=None) ``` (one thing my library does is convert betwixt `ast.Assign` and `ast.AnnAssign`… later I'll be doing more interesting variable type tracing to generate big `typing.Union` of all possible types each variable may have… but if it finds `None` then it will infer `typing.Optional`.) Here is my `ast.NodeTransformer` override for `visit_AnnAssign`: https://github.com/offscale/cdd-python/blob/968507e/cdd/doctrans_utils.py#L111-L131 Is there some way of rewriting an `ast.AnnAssign` to `ast.Assign` without losing type information? |
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msg408581 - (view) | Author: Jeremiah Gabriel Pascual (Crowthebird) * | Date: 2021-12-15 03:00 | |
This seems like just a problem of your library instead of a problem with Python. Are you sure this is the right place you're in? |
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msg408583 - (view) | Author: Samuel Marks (samuelmarks) * | Date: 2021-12-15 03:37 | |
Just fixed the issue by using this value: ```py "```(None)```" if sys.version_info[:2] >= (3, 9) else "```None```" ``` |
History | |||
---|---|---|---|
Date | User | Action | Args |
2022-04-11 14:59:53 | admin | set | github: 90236 |
2021-12-15 03:37:52 | samuelmarks | set | status: open -> closed messages: + msg408583 stage: resolved |
2021-12-15 03:00:40 | Crowthebird | set | nosy:
+ Crowthebird messages: + msg408581 |
2021-12-15 02:37:47 | samuelmarks | create |