Check if number should be C++ float or C++ double using python

I am working on a simple C++ code generator created by excel parsing and I will need to distinguish between number type. I can deduce integer size (e.g. uint_32_t) using sys.getsizeof() But How can I check if a non-decimal number should be float or a double in order to avoid narrowing? for each number I know its range, its minimal and maximal value, if it would be of any help. Thank you very much