change chained maps to MutableMapping; fix #6042#6044
Merged
JelleZijlstra merged 1 commit intopython:masterfrom Sep 29, 2021
Merged
change chained maps to MutableMapping; fix #6042#6044JelleZijlstra merged 1 commit intopython:masterfrom
JelleZijlstra merged 1 commit intopython:masterfrom