bpo-31271: fix an assertion failure in io.TextIOWrapper.write#3201

Merged

serhiy-storchaka merged 3 commits intopython:masterfrom orenmn:bpo31271-fix-assertion-failure

Aug 25, 2017

Commits on Aug 24, 2017

init commit
orenmn
committed

Commits on Aug 25, 2017

simplify the test
orenmn
committed
added a NEWS.d item, and made the error msg more like that of the similar error when the decoder doesn't return a str.
orenmn
committed