@Override
    public Void visitMapEntry(final GremlinParser.MapEntryContext ctx) {
        // if it is a terminal node that isn't a starting form like "(T.id)" then it has to be processed as a string
        // for python but otherwise it can just be handled as a generic literal
        final GremlinParser.MapKeyContext mapKeyContext = ctx.mapKey();
        visit(mapKeyContext);
        sb.append(": ");
        visit(ctx.getChild(2)); // value
        return null;
    }
Converts a Gremlin traversal string into a Python source code representation of that traversal with an aim at
sacrificing some formatting for the ability to compile correctly.
<ul>
    <li>Range syntax has no direct support</li>
    <li>Normalizes whitespace</li>
    <li>If floats are not suffixed they will translate as BigDecimal</li>
    <li>Makes anonymous traversals explicit with double underscore</li>
    <li>Makes enums explicit with their proper name</li>
</ul>
gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/language/translator/PythonTranslateVisitor.java