C ++ ape's Python note 09-fragmentation

Class Special Methods_ Init _ (self ,...) when constructing a _ del _ (Self) destructor _ STR _ (Self) Print Object or STR (), call _ LT _ (self, other) it is called when the operator is smaller than (<.

Similarly, all operators (+,>, and so on) have special methods.

_ Getitem _ (self, key) allows the object to use index operations. [Key] _ Len _ (Self) uses the built-in Len () for the sequence object () function call. Receiving tuples and lists in FunctionsTuples and lists use the * prefix dictionary with ** prefix. Lambda, exec, EvalLambda: Create a new function object exec, execute the python statement eval in the string, and calculate the python expression in the string