The latter subsentence would be better with a subject attached to avoid ambiguity. Without attaching a subject, it could be sounding like "you can write a Python expression, refer a variable, or other literal values", but it should be "you can write a Python expression that can refer to variables or other literal values", so it would be better if it's "其可以引用變數或其他字面值"

Also, here in the original sentence, it says "literal values" instead of "string literals", literal values could be string literals, integer literals, float literals etc., so it should use a different word, such as "字面值". But same as string literals, this translation does not sound familiar to any one, so it'll be better to parenthesise the original English word, just like the translation for "string literals".