Expression parsing

[perica22]

Hello,

I attempted to use Parser to evaluate the expression, but I encountered an error:

parser.Parser().parse("$number(findings) < 3")  
>>> TypeError: can only concatenate str (not 'NoneType') to str  

Could someone advise whether I'm using it incorrectly or if there's an issue with it?

[rayokota]

The parser is for internal use. Here the repl is complaining because the result of parser.Parser().parse("$number(findings) < 3") is not printable