MyPy crashes when __init__.py file contains from . import *

[ostrokach]

Minimal example:

mkdir example
echo "from . import *" > example/__init__.py
python -m mypy example/__init__.py

Traceback

username@username-desktop /tmp $ python -m mypy test_module/__init__.py --show-traceback
test_module/__init__.py: error: INTERNAL ERROR -- please report a bug at https://github.com/python/mypy/issues version: 0.540
Traceback (most recent call last):
  File "/home/username/anaconda/lib/python3.6/runpy.py", line 193, in _run_module_as_main
    "__main__", mod_spec)
  File "/home/username/anaconda/lib/python3.6/runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "/home/username/anaconda/lib/python3.6/site-packages/mypy/__main__.py", line 11, in 
    main(None)
  File "/home/username/anaconda/lib/python3.6/site-packages/mypy/main.py", line 50, in main
    res = type_check_only(sources, bin_dir, options)
  File "/home/username/anaconda/lib/python3.6/site-packages/mypy/main.py", line 103, in type_check_only
    options=options)
  File "/home/username/anaconda/lib/python3.6/site-packages/mypy/build.py", line 201, in build
    graph = dispatch(sources, manager)
  File "/home/username/anaconda/lib/python3.6/site-packages/mypy/build.py", line 1859, in dispatch
    graph = load_graph(sources, manager)
  File "/home/username/anaconda/lib/python3.6/site-packages/mypy/build.py", line 1942, in load_graph
    root_source=True)
  File "/home/username/anaconda/lib/python3.6/site-packages/mypy/build.py", line 1489, in __init__
    self.parse_file()
  File "/home/username/anaconda/lib/python3.6/site-packages/mypy/build.py", line 1687, in parse_file
    self.ignore_all or self.options.ignore_errors)
  File "/home/username/anaconda/lib/python3.6/contextlib.py", line 99, in __exit__
    self.gen.throw(type, value, traceback)
  File "/home/username/anaconda/lib/python3.6/site-packages/mypy/build.py", line 1578, in wrap_context
    yield
  File "/home/username/anaconda/lib/python3.6/site-packages/mypy/build.py", line 1687, in parse_file
    self.ignore_all or self.options.ignore_errors)
  File "/home/username/anaconda/lib/python3.6/site-packages/mypy/build.py", line 593, in parse_file
    tree = parse(source, path, self.errors, options=self.options)
  File "/home/username/anaconda/lib/python3.6/site-packages/mypy/parse.py", line 25, in parse
    options=options)
  File "/home/username/anaconda/lib/python3.6/site-packages/mypy/fastparse.py", line 96, in parse
    ).visit(ast)
  File "/home/username/anaconda/lib/python3.6/site-packages/mypy/fastparse.py", line 169, in visit
    return super().visit(node)
  File "/home/username/anaconda/lib/python3.6/site-packages/typed_ast/ast3.py", line 275, in visit
    return visitor(node)
  File "/home/username/anaconda/lib/python3.6/site-packages/mypy/fastparse.py", line 289, in visit_Module
    body = self.fix_function_overloads(self.translate_stmt_list(mod.body))
  File "/home/username/anaconda/lib/python3.6/site-packages/mypy/fastparse.py", line 182, in translate_stmt_list
    stmt = self.visit(e)
  File "/home/username/anaconda/lib/python3.6/site-packages/mypy/fastparse.py", line 169, in visit
    return super().visit(node)
  File "/home/username/anaconda/lib/python3.6/site-packages/typed_ast/ast3.py", line 275, in visit
    return visitor(node)
  File "/home/username/anaconda/lib/python3.6/site-packages/mypy/fastparse.py", line 126, in wrapper
    node = f(self, ast)
  File "/home/username/anaconda/lib/python3.6/site-packages/mypy/fastparse.py", line 654, in visit_ImportFrom
    assert n.module is not None
AssertionError:
test_module/__init__.py: : note: use --pdb to drop into pdb

---

mypy 0.540
Python 3.6.3
Linux Mint 18

[ostrokach]

Closing as this is a duplicate of #4111