diff --git a/builtins/2.7/_io.pyi b/builtins/2.7/_io.pyi
new file mode 100644
index 000000000..f776cf1fc
--- /dev/null
+++ b/builtins/2.7/_io.pyi
@@ -0,0 +1,105 @@
+from typing import Any, Iterable, Tuple, List, Union
+
+DEFAULT_BUFFER_SIZE = ...  # type: int
+
+
+class BlockingIOError(IOError):
+    characters_written = ...  # type: int
+
+class UnsupportedOperation(ValueError, IOError): ...
+
+
+class _IOBase(object):
+    closed = ...  # type: getset_descriptor
+    def __enter__(self) -> "_IOBase": ...
+    def __exit__(self, type, value, traceback) -> bool: ...
+    def __iter__(self) -> "_IOBase": ...
+    def _checkClosed(self) -> None: ...
+    def _checkReadable(self) -> None: ...
+    def _checkSeekable(self) -> None: ...
+    def _checkWritable(self) -> None: ...
+    def close(self) -> None: ...
+    def fileno(self) -> int: ...
+    def flush(self) -> None: ...
+    def isatty(self) -> bool: ...
+    def next(self) -> str: ...
+    def readable(self) -> bool: ...
+    def readline(self, limit: int = ...) -> str: ...
+    def readlines(self, hint: int = ...) -> List[str]: ...
+    def seek(self, offset: int, whence: int = ...) -> None: ...
+    def seekable(self) -> bool: ...
+    def tell(self) -> int: ...
+    def truncate(self, size: int = ...) -> int: ...
+    def writable(self) -> bool: ...
+    def writelines(self, lines: Iterable[str]) -> None: ...
+
+class _BufferedIOBase(_IOBase):
+    def read1(self, n: int) -> str: ...
+    def read(self, n: int = ...) -> str: ...
+    def readinto(self, buffer: bytearray) -> int: ...
+    def write(self, s: str) -> int: ...
+    def detach(self) -> "_BufferedIOBase": ...
+
+class BufferedRWPair(_BufferedIOBase):
+    def peek(self, n: int = ...) -> str: ...
+
+class BufferedRandom(_BufferedIOBase):
+    name = ...  # type: str
+    raw = ...  # type: _IOBase
+    mode = ...  # type: str
+    def peek(self, n: int = ...) -> str: ...
+
+class BufferedReader(_BufferedIOBase):
+    name = ...  # type: str
+    raw = ...  # type: _IOBase
+    mode = ...  # type: str
+    def peek(self, n: int = ...) -> str: ...
+
+class BufferedWriter(_BufferedIOBase):
+    name = ...  # type: str
+    raw = ...  # type: _IOBase
+    mode = ...  # type: str
+
+class BytesIO(_BufferedIOBase):
+    def __setstate__(self, tuple) -> None: ...
+    def __getstate__(self) -> tuple: ...
+    def getvalue(self) -> str: ...
+
+class _RawIOBase(_IOBase):
+    def readall(self) -> str: ...
+    def read(self, n: int = ...) -> str: ...
+
+class FileIO(_RawIOBase):
+    mode = ...  # type: str
+    closefd = ...  # type: bool
+    def readinto(self, buffer: bytearray)-> int: ...
+    def write(self, pbuf: str) -> int: ...
+
+class IncrementalNewlineDecoder(object):
+    newlines = ...  # type: AnyStr
+    def decode(self, input, final) -> Any: ...
+    def getstate(self) -> Tuple[Any, int]: ...
+    def setstate(self, state: Tuple[Any, int]) -> None: ...
+    def reset(self) -> None: ...
+
+class _TextIOBase(_IOBase):
+    errors = ...  # type: Optional[]
+    newlines = ...  # type: AnyStr
+    encoding = ...  # type: Optional[]
+    def read(self, n: int = ...) -> str: ...
+    def write(self): ...
+    def detach(self): ...
+
+class StringIO(_TextIOBase):
+    line_buffering = ...  # type: bool
+    def getvalue(self) -> str: ...
+    def __setstate__(self, state: tuple): ...
+    def __getstate__(self) -> tuple: ...
+
+class TextIOWrapper(_TextIOBase):
+    name = ...  # type: str
+    line_buffering = ...  # type: bool
+    buffer = ...  # type: str
+    _CHUNK_SIZE = ...  # type: int
+
+def open(file: Union[int, str], mode: str = ...) -> _IOBase: ...