Fix 'WriteToConn' object has no attribute 'flush'
#16801
Merged
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WriteToConn
replaces stdout and stderr to capture output, but causes issues because it doesn't implement theTextIO
API (as expected ofsys.stdout
andsys.stderr
).By stubbing the rest of the
TextIO
API we prevent issues with other code which uses more of the API than we had previously accounted for.Fixes #16678