datatype conversion can happen either explicitly or implicitly operators are constructs that manipulate the value of operands operators may be unary or binary an expression is combination of valuesvariables and operators python has input(function for taking user input python has print(function to output data to standard output device exercise which of the following identifier names are invalid and whyi ii iii iv serial_no st_room hundredtotal marks vi vii viii total_marks total-marks _percentage true write the corresponding statementspython assignment aassign to variable length and to variable breadth bassign the average of values of variables length and breadth to variable sum cassign list containing strings 'paper''gel pen'and 'eraserto variable stationery dassign the strings 'mohandas''karamchand'and 'gandhito variables firstmiddle and last eassign the concatenated value of string variables firstmiddle and last to variable fullname make sure to incorporate blank spaces appropriately between different parts of names write logical expressions corresponding to the following statements in python and evaluate the expressions (assuming variables num num num firstmiddlelast are already having meaningful values)athe sum of and - is less than bnum is not more than - notes