Support calling eval and ast module with unicode in Python 2 (#1440)

Author: rowillia

stdlib/2/__builtin__.pyi

@@ -939,7 +939,7 @@ class UnicodeWarning(Warning): ...
 class BytesWarning(Warning): ...
 class ResourceWarning(Warning): ...
 
-def eval(s: str, globals: Dict[str, Any] = ..., locals: Dict[str, Any] = ...) -> Any: ...
+def eval(s: Union[str, unicode], globals: Dict[str, Any] = ..., locals: Dict[str, Any] = ...) -> Any: ...
 def exec(object: str,
          globals: Optional[Dict[str, Any]] = None,
          locals: Optional[Dict[str, Any]] = None) -> Any: ...  # TODO code object as source

stdlib/2/ast.pyi

@@ -21,15 +21,15 @@ __version__ = ...  # type: str
 PyCF_ONLY_AST = ...  # type: int
 
 
-def parse(source: Union[str, bytes], filename: Union[str, bytes] = ..., mode: str = ...) -> Module: ...
+def parse(source: Union[str, unicode], filename: Union[str, unicode] = ..., mode: Union[str, unicode] = ...) -> Module: ...
 def copy_location(new_node: AST, old_node: AST) -> AST: ...
 def dump(node: AST, annotate_fields: bool = ..., include_attributes: bool = ...) -> str: ...
 def fix_missing_locations(node: AST) -> AST: ...
 def get_docstring(node: AST, clean: bool = ...) -> str: ...
 def increment_lineno(node: AST, n: int = ...) -> AST: ...
 def iter_child_nodes(node: AST) -> Iterator[AST]: ...
 def iter_fields(node: AST) -> Iterator[typing.Tuple[str, Any]]: ...
-def literal_eval(node_or_string: Union[str, AST]) -> Any: ...
+def literal_eval(node_or_string: Union[str, unicode, AST]) -> Any: ...
 def walk(node: AST) -> Iterator[AST]: ...
 
 class NodeVisitor():