def main():
    timestamp = datetime.datetime.utcnow().strftime("%Y%m%d_%H%M%S")

    ORIG_DB = 'orig_db_%s' % timestamp
    NEW_DB = timestamp % 'new_db_%s'

    ORIG_DUMP = ORIG_DB + ".dump"
    NEW_DUMP = NEW_DB + ".dump"

    options = parse_options()
    db_url, orig_branch, orig_version, new_branch, new_version = options

    # Since we're going to be switching branches, ensure user doesn't have any
    # uncommitted changes
    if git_has_uncommited_changes():
        die("You have uncommitted changes. Please commit them before running "
            "this command.")

    db_driver = _get_db_driver_class(db_url)()

    users_branch = git_current_branch_name()
    git_checkout(orig_branch)

    try:
        # Dump Original Schema
        dump_db(db_driver, ORIG_DB, db_url, orig_version, ORIG_DUMP)

        # Dump New Schema
        git_checkout(new_branch)
        dump_db(db_driver, NEW_DB, db_url, new_version, NEW_DUMP)

        diff_files(ORIG_DUMP, NEW_DUMP)
    finally:
        git_checkout(users_branch)

        if os.path.exists(ORIG_DUMP):
            os.unlink(ORIG_DUMP)

        if os.path.exists(NEW_DUMP):
            os.unlink(NEW_DUMP)
dataset/ETHPy150Open BU-NU-CLOUD-SP16/Trusted-Platform-Module-nova/tools/db/schema_diff.py/main/swapped operands of `%`