Fix couple stub issues (#128)

Author: ilevkivskyi

sqlalchemy-stubs/engine/base.pyi

@@ -1,4 +1,4 @@
-from typing import Any, Optional, Dict, Union
+from typing import Any, Optional, Dict, Union, Text
 from sqlalchemy import log
 from sqlalchemy.sql.expression import ClauseElement
 from sqlalchemy.sql.functions import FunctionElement
@@ -103,7 +103,7 @@ class Engine(Connectable, log.Identified):
     def transaction(self, callable_, *args, **kwargs): ...
     def run_callable(self, callable_, *args, **kwargs): ...
     def execute(self,
-                object: Union[str, ClauseElement, FunctionElement, DDLElement, DefaultGenerator, Compiled],
+                object: Union[Text, ClauseElement, FunctionElement, DDLElement, DefaultGenerator, Compiled],
                 *multiparams: Any,
                 **params: Any) -> ResultProxy: ...
     def scalar(self, statement, *multiparams, **params): ...

sqlalchemy-stubs/sql/operators.pyi

@@ -1,4 +1,4 @@
-from typing import Any, Optional, Text, List, Union
+from typing import Any, Iterable, Optional, Text, Union
 from .selectable import Select as Select
 from .elements import BindParameter as BindParameter, UnaryExpression
 
@@ -42,8 +42,8 @@ class ColumnOperators(Operators):
     def concat(self, other): ...
     def like(self, other: Text, escape: Optional[Any] = ...): ...
     def ilike(self, other: Text, escape: Optional[Any] = ...): ...
-    def in_(self, other: Union[List[Any], BindParameter, Select]): ...
-    def notin_(self, other: Union[List[Any], BindParameter, Select]): ...
+    def in_(self, other: Union[Iterable[Any], BindParameter, Select]): ...
+    def notin_(self, other: Union[Iterable[Any], BindParameter, Select]): ...
     def notlike(self, other, escape: Optional[Any] = ...): ...
     def notilike(self, other, escape: Optional[Any] = ...): ...
     def is_(self, other): ...

sqlalchemy-stubs/sql/schema.pyi

@@ -1,10 +1,10 @@
 from typing import (
-    Any, Optional, Union, Set, Generic, TypeVar, Type, List, Dict, Tuple, Set, Sequence as SequenceType, Mapping,
+    Any, Optional, Union, Generic, TypeVar, Type, List, Tuple, Set, Sequence as SequenceType, Mapping,
     Callable, Iterable, Iterator, overload
 )
 from . import visitors, functions
 from .base import SchemaEventTarget as SchemaEventTarget, DialectKWArgs as DialectKWArgs, ColumnCollection
-from .elements import ColumnClause as ColumnClause, TextClause
+from .elements import ColumnClause as ColumnClause, TextClause, ColumnElement
 from .selectable import TableClause as TableClause
 from .type_api import TypeEngine
 from .. import util
@@ -304,7 +304,7 @@ class Index(DialectKWArgs, ColumnCollectionMixin, SchemaItem):
     name: str = ...
     unique: bool = ...
     info: Optional[Mapping[str, Any]] = ...
-    def __init__(self, name: str, *expressions: Union[TextClause, Column[Any], str], unique: bool = ...,
+    def __init__(self, name: str, *expressions: Union[TextClause, ColumnElement[Any], str], unique: bool = ...,
                  quote: Optional[bool] = ..., info: Optional[Mapping[str, Any]] = ..., **kw: Any) -> None: ...
     @property
     def bind(self) -> Optional[Union[Engine, Connection]]: ...