Add stubs for py_compile. (#954)

* Add stubs for py_compile.

* Correct Text

stdlib/2and3/py_compile.pyi

@@ -0,0 +1,20 @@
+# Stubs for py_compile (Python 2 and 3)
+import sys
+
+from typing import Optional, List, Text, AnyStr, Union
+
+_EitherStr = Union[bytes, Text]
+
+class PyCompileError(Exception):
+    exc_type_name = ...  # type: str
+    exc_value = ...  # type: BaseException
+    file = ...  # type: str
+    msg = ...  # type: str
+    def __init__(self, exc_type: str, exc_value: BaseException, file: str, msg: str = ...) -> None: ...
+
+if 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]] = ...): ...