add annotations to open()

benjaminp · benjaminp · commit 9990e8c26422 · 2009-04-18T14:47:50.000Z
diff --git a/Lib/_pyio.py b/Lib/_pyio.py
@@ -35,8 +35,9 @@ def __init__(self, errno, strerror, characters_written=0):
         self.characters_written = characters_written
 
 
-def open(file, mode="r", buffering=None, encoding=None, errors=None,
-         newline=None, closefd=True):
+def open(file: (str, bytes), mode: str = "r", buffering: int = None,
+         encoding: str = None, errors: str = None,
+         newline: str = None, closefd: bool = True) -> "IOBase":
 
     r"""Open file and return a stream.  Raise IOError upon failure.
 
