computer science class xi gender 'mprice message "keep smilingprogram - write program to display values of variables in python #program - #to display values of variables message "keep smilingprint(messageuserno print('user number is'usernooutputkeep smiling user number is in the program - the variable message holds string type value and so its content is assigned within double quotes (can also be within single quotes ')whereas the value of variable userno is not enclosed in quotes as it is numeric value variable declaration is implicit in pythonmeans variables are automatically declared and defined when they are assigned value the first time variables must always be assigned values before they are used in expressions as otherwise it will lead to an error in the program wherever variable name occurs in an expressionthe interpreter replaces it with the value of that particular variable program - write python program to find the area of rectangle given that its length is units and breadth is units #program - #to find the area of rectangle length breadth area length breadth print(areaoutput comments comments are used to add remark or note in the source code comments are not executed by interpreter -