This appears to have broken pydoc of the select module, I've attached a patch

$ python3.8 -m pydoc select
Traceback (most recent call last):
  File "/usr/lib/python3.8/inspect.py", line 2004, in wrap_value
    value = eval(s, module_dict)
  File "<string>", line 1, in <module>
NameError: name 'EPOLLIN' is not defined

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/lib/python3.8/inspect.py", line 2007, in wrap_value
    value = eval(s, sys_module_dict)
  File "<string>", line 1, in <module>
NameError: name 'EPOLLIN' is not defined

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/lib/python3.8/runpy.py", line 193, in _run_module_as_main
    return _run_code(code, main_globals, None,
  File "/usr/lib/python3.8/runpy.py", line 86, in _run_code
    exec(code, run_globals)
  File "/usr/lib/python3.8/pydoc.py", line 2769, in <module>
    cli()
  File "/usr/lib/python3.8/pydoc.py", line 2731, in cli
    help.help(arg)
  File "/usr/lib/python3.8/pydoc.py", line 1971, in help
    elif request: doc(request, 'Help on %s:', output=self._output)
  File "/usr/lib/python3.8/pydoc.py", line 1694, in doc
    pager(render_doc(thing, title, forceload))
  File "/usr/lib/python3.8/pydoc.py", line 1687, in render_doc
    return title % desc + '\n\n' + renderer.document(object, name)
  File "/usr/lib/python3.8/pydoc.py", line 384, in document
    if inspect.ismodule(object): return self.docmodule(*args)
  File "/usr/lib/python3.8/pydoc.py", line 1183, in docmodule
    contents.append(self.document(value, key, name))
  File "/usr/lib/python3.8/pydoc.py", line 385, in document
    if inspect.isclass(object): return self.docclass(*args)
  File "/usr/lib/python3.8/pydoc.py", line 1352, in docclass
    attrs = spill("Methods %s:\n" % tag, attrs,
  File "/usr/lib/python3.8/pydoc.py", line 1298, in spill
    push(self.document(value,
  File "/usr/lib/python3.8/pydoc.py", line 386, in document
    if inspect.isroutine(object): return self.docroutine(*args)
  File "/usr/lib/python3.8/pydoc.py", line 1411, in docroutine
    signature = inspect.signature(object)
  File "/usr/lib/python3.8/inspect.py", line 3093, in signature
    return Signature.from_callable(obj, follow_wrapped=follow_wrapped)
  File "/usr/lib/python3.8/inspect.py", line 2842, in from_callable
    return _signature_from_callable(obj, sigcls=cls,
  File "/usr/lib/python3.8/inspect.py", line 2296, in _signature_from_callable
    return _signature_from_builtin(sigcls, obj,
  File "/usr/lib/python3.8/inspect.py", line 2109, in _signature_from_builtin
    return _signature_fromstr(cls, func, s, skip_bound_arg)
  File "/usr/lib/python3.8/inspect.py", line 2057, in _signature_fromstr
    p(name, default)
  File "/usr/lib/python3.8/inspect.py", line 2039, in p
    default_node = RewriteSymbolics().visit(default_node)
  File "/usr/lib/python3.8/ast.py", line 360, in visit
    return visitor(node)
  File "/usr/lib/python3.8/ast.py", line 445, in generic_visit
    new_node = self.visit(old_value)
  File "/usr/lib/python3.8/ast.py", line 360, in visit
    return visitor(node)
  File "/usr/lib/python3.8/ast.py", line 445, in generic_visit
    new_node = self.visit(old_value)
  File "/usr/lib/python3.8/ast.py", line 360, in visit
    return visitor(node)
  File "/usr/lib/python3.8/inspect.py", line 2031, in visit_Name
    return wrap_value(node.id)
  File "/usr/lib/python3.8/inspect.py", line 2009, in wrap_value
    raise RuntimeError()
RuntimeError