def ensure_env_vars():
    for var in ['DX_FS_ROOT',
                'DX_TEST_CODE_PATH',
                'DX_TEST_JOB_HOMEDIRS']:
        if environ not in var:
            sys.exit('Error: Cannot run an entry point locally if the environment variable ' + var + ' has not been set')
dataset/ETHPy150Open dnanexus/dx-toolkit/src/python/dxpy/utils/local_exec_utils.py/ensure_env_vars/swapped operands of `not in`