def usage(msg=None):
    if msg:
        print("ERROR: %s" % msg, file=sys.stderr)

    prog = "schema_diff.py"
    args = ["<db-url>", "<orig-branch:orig-version>",
            "<new-branch:new-version>"]

    print((prog, ' '.join(args)) % "usage: %s %s", file=sys.stderr)
    sys.exit(1)
dataset/ETHPy150Open BU-NU-CLOUD-SP16/Trusted-Platform-Module-nova/tools/db/schema_diff.py/usage/swapped operands of `%`