from datetime import datetime categories $=["$General Consultation", "Obstetrics and Gynaecology", "Minor Surgery"$]$ # Initial data with today's date initial$\_$data $=\{$ "General Consultation": $[("$Joyce Wong", datetime.now$().$strftime$(\text{'}\%$Y$-\%$m$-\%$d$\text{'})),("$Celine Kang", datetime.now$().$strftime$(\text{'}\%$Y$-\%$m$-\%$d$\text{'}))],$ "Obstetrics and Gynaecology": $[("$Mandy Pang", datetime.now$().$strftime$(\text{'}\%$Y$-\%$m$-\%$d$\text{'})),("$Nancy Lee", datetime.now$().$strftime$(\text{'}\%$Y$-\%$m$-\%$d$\text{'}))],$ "Minor Surgery": $[("$David Ong", datetime.now$().$strftime$(\text{'}\%$Y$-\%$m$-\%$d$\text{'})),("$Emily Tan", datetime.now$().$strftime$(\text{'}\%$Y$-\%$m$-\%$d$\text{'}))]\}$ queues $=\{\}$ for category in categories: queues$[$category$]=[]$ for category, patients in initial$\_$data.items$()$: for patient$\_$name, schedule$\_$date in patients: queues$[$category$].$append$(\{"$name$"$: patient$\_$name, "date": schedule$\_$date, "time": $""\})$ # Initialize time to empty string def print$\_$queues$()$: for category, queue in queues.items$()$: print$($f$"$

$\{$category$\}$ queue:"$)$ for patient in queue: print$($f$"\{$patient$[\text{'}$name$\text{'}]\}(\{$patient$[\text{'}$date$\text{'}]\}\{$patient$[\text{'}$time$\text{'}]\})")$ if not queue: print$("$No patients in queue."$)$ def call$\_$patient$($category$)$: if queues$[$category$]$: patient $=$ queues$[$category$].$pop$(0)$ schedule$\_$time $=$ input$($f$"$Enter the schedule time for $\{$patient$[\text{'}$name$\text{'}]\}$ on $\{$patient$[\text{'}$date$\text{'}]\}($HH:MM$)$: $")$ patient$[\text{'}$time$\text{'}]=$ schedule$\_$time print$($f$"$Patient to be called: $\{$patient$[\text{'}$name$\text{'}]\}.")$ print$($f$"$Scheduled time: $\{$patient$[\text{'}$date$\text{'}]\}\{$patient$[\text{'}$time$\text{'}]\}")$ else: print$("$No patients in queue."$)$ def add$\_$patient$()$: name $=$ input$("$Enter patient name: $")$ schedule$\_$date $=$ datetime.now$().$strftime$(\text{'}\%$Y$-\%$m$-\%$d$\text{'})$ print$("$Please choose a category for the patient:"$)$ for i$,$ category in enumerate$($categories$,1)$: print$($f$"[\{$i$\}]\{$category$\}")$ category$\_$choice $=$ int$($input$())-1$ if $0<=$ category$\_$choice $<$ len$($categories$)$: queues$[$categories$[$category$\_$choice$]].$append$(\{"$name$"$: name, "date": schedule$\_$date, "time": $""\})$ print$\_$queues$()$ else: print$("$Invalid choice, please try again."$)$ def main$()$: while True: action $=$ input$("$

Would you like to call patients? $($yes$/$no$)$: $").$lower$()$ if action $==$ "yes": print$("$Please choose a category to call a patient:"$)$ for i$,$ category in enumerate$($categories$,1)$: print$($f$"[\{$i$\}]\{$category$\}")$ category$\_$choice $=$ int$($input$())-1$ if $0<=$ category$\_$choice $<$ len$($categories$)$: call$\_$patient$($categories$[$category$\_$choice$])$ print$\_$queues$()$ else: print$("$Invalid choice, please try again."$)$ elif action $=="$no$"$: add$\_$patient$()$ else: print$("$Exiting program."$)$ break if $\_\_$name$\_\_=="\_\_$main$\_\_"$: main$(),$ add comments and explain this code every single line