Fixes to style of Python 3 builtins
Rename T to _T in builtins since it's internal
Rename S to _S in builtins since it's internal
Rename additional internal definitions in builtins
Rename internal definitions in builtins
Fixes to style of Python 2 builtins
Rename internal definitions in 2.7 builtins
Rename internal definitions in 2.7 builtins
Rename internal definition in 2.7 builtins
Rename internal definition in 2.7 builtins
Fix unittest stub
Style fixes to typing stubs
Style fixes to 2.7 typing stubs