Re-organize directory structure (#4971)

See discussion in #2491

Co-authored-by: Ivan Levkivskyi <ilevkivskyi@dropbox.com>

stdlib/py_compile.pyi

@@ -0,0 +1,52 @@
+import enum
+import sys
+from typing import AnyStr, List, Optional, Text, Type, Union
+
+_EitherStr = Union[bytes, Text]
+
+class PyCompileError(Exception):
+    exc_type_name: str
+    exc_value: BaseException
+    file: str
+    msg: str
+    def __init__(self, exc_type: Type[BaseException], exc_value: BaseException, file: str, msg: str = ...) -> None: ...
+
+if sys.version_info >= (3, 7):
+    class PycInvalidationMode(enum.Enum):
+        TIMESTAMP: int = ...
+        CHECKED_HASH: int = ...
+        UNCHECKED_HASH: int = ...
+    def _get_default_invalidation_mode() -> PycInvalidationMode: ...
+
+if sys.version_info >= (3, 8):
+    def compile(
+        file: AnyStr,
+        cfile: Optional[AnyStr] = ...,
+        dfile: Optional[AnyStr] = ...,
+        doraise: bool = ...,
+        optimize: int = ...,
+        invalidation_mode: Optional[PycInvalidationMode] = ...,
+        quiet: int = ...,
+    ) -> Optional[AnyStr]: ...
+
+elif sys.version_info >= (3, 7):
+    def compile(
+        file: AnyStr,
+        cfile: Optional[AnyStr] = ...,
+        dfile: Optional[AnyStr] = ...,
+        doraise: bool = ...,
+        optimize: int = ...,
+        invalidation_mode: Optional[PycInvalidationMode] = ...,
+    ) -> Optional[AnyStr]: ...
+
+elif sys.version_info >= (3, 2):
+    def compile(
+        file: AnyStr, cfile: Optional[AnyStr] = ..., dfile: Optional[AnyStr] = ..., doraise: bool = ..., optimize: int = ...
+    ) -> Optional[AnyStr]: ...
+
+else:
+    def compile(
+        file: _EitherStr, cfile: Optional[_EitherStr] = ..., dfile: Optional[_EitherStr] = ..., doraise: bool = ...
+    ) -> None: ...
+
+def main(args: Optional[List[Text]] = ...) -> int: ...