$.$ Import the random module. $6.$ Define the isSingleDigit$($userStr$)$ function. Parameter: userStr is a string that holds input from the user Return value: a boolean $($True or False$)$ depending if userStr is a string containing one single digit This function determines if the user entered a string containing a single digit $(09).$ o Check to see if the userStr parameter contains only digit and the length is $1.$ If so$,$ return True. If not, return False. To do this, call the len$()$ function and the str$.$isdigit$()$ method. o You will call this function in the createUserGuess$()$ function. $7.$ Define the createSecretCode$($numDigits$)$ function. Parameter: numDigits is an integer which determines the number of digits in the secret code list Return value: a list containing randomly selected integers between $0$ and $9($inclusive$)$ and the length of the list is the numDigits parameter This function create a list of single digits. o Create a varible that initially holds an empty list.