++ dirname ./tools/run_tests/build_python.sh
+ cd ./tools/run_tests/../..
++ pwd
+ ROOT=/var/local/git/grpc
+ GRPCIO=/var/local/git/grpc/src/python/grpcio
+ export LD_LIBRARY_PATH=/var/local/git/grpc/libs/opt
+ LD_LIBRARY_PATH=/var/local/git/grpc/libs/opt
+ export DYLD_LIBRARY_PATH=/var/local/git/grpc/libs/opt
+ DYLD_LIBRARY_PATH=/var/local/git/grpc/libs/opt
+ export PATH=/var/local/git/grpc/bins/opt:/var/local/git/grpc/bins/opt/protobuf:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
+ PATH=/var/local/git/grpc/bins/opt:/var/local/git/grpc/bins/opt/protobuf:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
+ export 'CFLAGS=-I/var/local/git/grpc/include -std=c89'
+ CFLAGS='-I/var/local/git/grpc/include -std=c89'
+ export LDFLAGS=-L/var/local/git/grpc/libs/opt
+ LDFLAGS=-L/var/local/git/grpc/libs/opt
+ export GRPC_PYTHON_BUILD_WITH_CYTHON=1
+ GRPC_PYTHON_BUILD_WITH_CYTHON=1
+ export GRPC_PYTHON_ENABLE_CYTHON_TRACING=1
+ GRPC_PYTHON_ENABLE_CYTHON_TRACING=1
+ cd /var/local/git/grpc/src/python/grpcio
+ tox --notest
./tools/run_tests/build_python.sh: line 47: tox: command not found
+ EXITCODE=127
+ docker rm -f build_grpc_interop_python_7281ba4c-49c1-4312-808a-31818efe7cef
build_grpc_interop_python_7281ba4c-49c1-4312-808a-31818efe7cef
+ exit 127

FAILED: build_docker_python [ret=127, pid=10854]