pstats: add stub (#727)

partially addresses #531

stdlib/2and3/pstats.pyi

@@ -0,0 +1,34 @@
+from profile import Profile
+from cProfile import Profile as cProfile
+from typing import Any, AnyStr, Dict, IO, Iterable, List, Text, Tuple, TypeVar, Union, overload
+
+_Selector = Union[str, float, int]
+_T = TypeVar('_T', bound='Stats')
+
+class Stats:
+    def __init__(self: _T, __arg: Union[None, str, Text, Profile, cProfile] = ...,
+                 *args: Union[None, str, Text, Profile, cProfile, _T],
+                 stream: IO[Any]) -> None: ...
+    def init(self, arg: Union[None, str, Text, Profile, cProfile]) -> None: ...
+    def load_stats(self, arg: Union[None, str, Text, Profile, cProfile]) -> None: ...
+    def get_top_level_stats(self) -> None: ...
+    def add(self: _T, *arg_list: Union[None, str, Text, Profile, cProfile, _T]) -> _T: ...
+    def dump_stats(self, filename: AnyStr) -> None: ...
+    def get_sort_arg_defs(self) -> Dict[str, Tuple[Tuple[Tuple[int, int], ...], str]]: ...
+    @overload
+    def sort_stats(self: _T, field: int) -> _T: ...
+    @overload
+    def sort_stats(self: _T, *field: str) -> _T: ...
+    def reverse_order(self: _T) -> _T: ...
+    def strip_dirs(self: _T) -> _T: ...
+    def calc_callees(self) -> None: ...
+    def eval_print_amount(self, sel: _Selector, list: List[str], msg: str) -> Tuple[List[str], str]: ...
+    def get_print_list(self, sel_list: Iterable[_Selector]) -> Tuple[int, List[str]]: ...
+    def print_stats(self: _T, *amount: _Selector) -> _T: ...
+    def print_callees(self: _T, *amount: _Selector) -> _T: ...
+    def print_callers(self: _T, *amount: _Selector) -> _T: ...
+    def print_call_heading(self, name_size: int, column_title: str) -> None: ...
+    def print_call_line(self, name_size: int, source: str, call_dict: Dict[str, Any], arrow: str = ...) -> None: ...
+    def print_title(self) -> None: ...
+    def print_line(self, func: str) -> None: ...
+