class Node: def $\_\_$init$\_\_($self$,$ filename, date$\_$time$)$: self.filename $=$ filename self.date$\_$time $=$ date$\_$time self.next $=$ None class LinkedList: def $\_\_$init$\_\_($self$)$: self.head $=$ None def insert$($self$,$ filename, date$\_$time$)$: new$\_$node $=$ Node$($filename$,$ date$\_$time$)$ if self.head is None or self.head.date$\_$time $>$ date$\_$time: new$\_$node.next $=$ self.head self.head $=$ new$\_$node else: current $=$ self.head while current.next and current.next.date$\_$time $<$ date$\_$time: current $=$ current.next new$\_$node.next $=$ current.next current.next $=$ new$\_$node def print$\_$list$($self$)$: current $=$ self.head while current: print$($current$.$filename$)$ current $=$ current.next def display$\_$menu$()$: print$("$

Menu:"$)$ print$("1.$ View patient visit list"$)$ print$("2.$ Add new patient visit"$)$ print$("3.$ Exit"$)$ def add$\_$new$\_$visit$($linked$\_$list$)$: patient $=$ input$("$Enter patient name: $")$ date$\_$time $=$ input$("$Enter visit date and time $($YYYYMMDD$\_$HHMM$)$: $")$ filename $=$ f$"\{$patient$\}\_\{$date$\_$time$\}"$ linked$\_$list.insert$($filename$,$ date$\_$time$)$ print$("$New patient visit added."$)$ def main$()$: # Simulated data patients$\_$visits $=[("$Alice$","20230520\_0930"),("$Bob$","20230521\_1030"),("$Alice$","20230522\_1100"),("$Charlie$","20230522\_1130"),("$David$","20230523\_1230"),("$Eve$","20230524\_1330"),("$Alice$","20230524\_1430"),("$Frank$","20230525\_1530"),("$George$","20230526\_1630"),("$Henry$","20230527\_1730"),("$Ivy$","20230528\_1830"),("$Jack$","20230529\_1930"),("$Bob$","20230530\_2030"),("$Charlie$","20230601\_2130"),("$Bob$","20230602\_2230"),]$ # Create linked list and add data ll $=$ LinkedList$()$ for patient, datetime in patients$\_$visits: filename $=$ f$"\{$patient$\}\_\{$datetime$\}"$ ll$.$insert$($filename$,$ datetime$)$ while True: display$\_$menu$()$ choice $=$ input$("$

Enter your choice: $")$ if choice $==\text{'}1\text{'}$: print$("$

List of patient visit filenames:"$)$ ll$.$print$\_$list$()$ elif choice $==\text{'}2\text{'}$: add$\_$new$\_$visit$($ll$)$ elif choice $==\text{'}3\text{'}$: print$("$

Exiting the program."$)$ break else: print$("$

Invalid choice. Please try again."$)$ if $\_\_$name$\_\_=="\_\_$main$\_\_"$: main$()$add comments and explanation