the name of the slot of nb_multiply not nb_mul
PySequence_Fast generally returns a list not a tuple (closes #16395)
PySequence_Fast generally returns a list (#16305)
use imperative
Issue #21179: Fix description of 'round' function for numbers.Real.
issue #21190: Fix the docs README link
make sure fdopen always closes the fd in error cases (closes #21191)
Issue #20644: Keep build-installer.py in sync across active versions.
Issue #21187: Fix OS X installer fail-to-build with Xcode 5.1.
add matrix multiplication operator support to 2to3
teach 2to3 about 'yield from'
Issue #21172: isinstance check relaxed from dict to collections.Mapping.