Within my code, I am suppose to use recursion somewhere there to ensure that it connects my trunk lines properly to allow phone calls and I am ensure as to how I can do so and where. It is strongly reccomended I use recursion because any other solution, does not output my desired output. I am suppose to ensure that I have a trunk list for each area code then connect them when I call switch$-$connect. The end$-$call function is also suppose to disconnect the two numbers from each other.I have tried countless attempts on how to connect the two phone lines together and correctly display that they are connected. my desired output is that after using phone$-$add twice on $2$ different phone numbers with $2$ different area codes, then using phone$-$call, my output does say that the lines are not connected, but after using switch$-$connect on the $2$ area codes from the phone$-$add, then using phone$-$call, it's suppose to say that the phone lines are now connected, but my code fails to show that. Can someone help me on this problem I can show you the code an

import json

QUIT $=$ 'quit'

SWITCH$\_$CONNECT $=$ 'switch$-$connect'

SWITCH$\_$ADD $=$ 'switch$-$add'

PHONE$\_$ADD $=$ 'phone$-$add'

NETWORK$\_$SAVE $=$ 'network$-$save'

NETWORK$\_$LOAD $=$ 'network$-$load'

START$\_$CALL $=$ 'start$-$call'

END$\_$CALL $=$ 'end$-$call'

DISPLAY $=$ 'display'

HYPHEN $=\text{'}-\text{'}$

def connect$\_$switchboards$($switchboards$,$ area$\_1,$ area$\_2)$:

if area$\_1$ not in switchboards:

switchboards$[$area$\_1]=\{\}$

if area$\_2$ not in switchboards:

switchboards$[$area$\_2]=\{\}$

switchboards$[$area$\_1][$area$\_2]=\{\}$

switchboards$[$area$\_2][$area$\_1]=\{\}$

def add$\_$switchboard$($switchboards$,$ area$\_$code$)$:

switchboards$[$area$\_$code$]=\{\}$

def add$\_$phone$($switchboards$,$ area$\_$code, phone$\_$number$)$:

if area$\_$code not in switchboards:

switchboards$[$area$\_$code$]=\{\}$

switchboards$[$area$\_$code$][$phone$\_$number$]=[]$

def save$\_$network$($switchboards$,$ file$\_$name$)$:

with open$($file$\_$name, $\text{'}$w$\text{'})$ as f:

json.dump$($switchboards$,$ f$)$

def load$\_$network$($file$\_$name$)$:

with open$($file$\_$name, $\text{'}$r$\text{'})$ as f:

switchboards $=$ json.load$($f$)$

return switchboards

def start$\_$call$($switchboards$,$ start$\_$area, start$\_$number, end$\_$area, end$\_$number$)$:

if start$\_$area not in switchboards or end$\_$area not in switchboards:

print$(\text{'}$Invalid area code.$\text{'})$

return

start$\_$dsphone str$($start$\_$number$)$

end$\_$phone $=$ str$($end$\_$number$)$

if start$\_$area $==$ end$\_$area:

switchboards$[$start$\_$area$].$setdefault$($start$\_$phone, $[]).$append$($end$\_$phone$)$

print$($f$\text{'}$Local call: $\{$start$\_$area$\}\{$start$\_$phone$\}$ and $\{$end$\_$area$\}\{$end$\_$phone$\}$ are now connected.$\text{'})$

elif switchboards$[$start$\_$area$].$get$($end$\_$area$)$ or switchboards$[$end$\_$area$].$get$($start$\_$area$)$:

if end$\_$area not in switchboards$[$start$\_$area$]$:

print$($f$\text{'}$Connecting switchboards $\{$start$\_$area$\}$ and $\{$end$\_$area$\}.\text{'})$

connect$\_$switchboards$($switchboards$,$ start$\_$area, end$\_$area$)$

switchboards$[$start$\_$area$][$start$\_$phone$].$append$($end$\_$phone$)$

switchboards$[$end$\_$area$][$end$\_$phone$].$append$($start$\_$phone$)$

print$($f$\text{'}$Long distance call: $\{$start$\_$area$\}\{$start$\_$phone$\}$ and $\{$end$\_$area$\}\{$end$\_$phone$\}$ are now connected.$\text{'})$

else:

print$($f$\text{'}$Cannot connect phones: $\{$start$\_$area$\}\{$start$\_$phone$\}$ to $\{$end$\_$area$\}\{$end$\_$phone$\}.\text{'})$

def end$\_$call$($switchboards$,$ start$\_$area, start$\_$number$)$:

if len$($switchboards$[$start$\_$area$][$start$\_$number$])>0$:

switchboards$[$start$\_$area$][$start$\_$number$].$pop$()$

else:

print$($f$\text{'}$No call in progress for phone $\{$start$\_$area$\}\{$start$\_$number$\}.\text{'})$

def display$\_$switchboard$($switchboards$,$ switchboard$)$:

print$($f$\text{'}$Switchboard with area code: $\{$switchboard$\}\text{'})$

print$(\text{'}$Trunk lines are:$\text{'})$

for connected$\_$area in switchboards$[$switchboard$]$:

print$($f$\text{'}$Trunk line connection to: $\{$connected$\_$area$\}\text{'})$

print$(\text{'}$Local phone numbers are:$\text{'})$

for phone$\_$number, connections in switchboards$[$switchboard$].$items$()$:

if not connections:

print$($f$\text{'}$Phone with number: $\{$phone$\_$number$\}$ is not in use.$\text{'})$

else:

for connection in connections:

print$($f$\text{'}$Phone with number: $\{$connection$\}$ is in use.$\text{'})$

def display$($switchboards$)$:

for switchboard in switchboards:

display$\_$switchboard$($switchboards$,$ switchboard$)$

$($main code will be sent as a picture$)$

I will also provide the sample output of what is required if that will help.

Enter command: switch$-$add $443$

Enter command: switch$-$add $410$

Enter command: switch$-$add $656$

Enter command: display

Switchboard with area code: $443$

Trunk lines are:

Local phone numbers are:

Switchboard with area code: $410$

Trunk lines are:

Local phone numbers are:

Switchboard with area code: $656$

Trunk lines are:

Local phone numbers are:

Enter command: switch$-$connect $443410$

Enter command: phone$-$add $656-112-3412$

Enter command: phone$-$add $443-132-1332$

Enter command: display

Switchboard with area code: $443$

Trunk lines are:

Trunk line connection to: $410$

Phone with number: $1123412$ is not in use.

Enter command: start$-$call $656-112-3412443-132-1332$

$656-112-3412$ and $443-132-1332$ were not connected

enter command: switch$-$connect $656443$

Enter command: start$-$call $656-112-3412443-132-1332$

$656-112-3412$ and $443-132-1332$ are now connected.