In this programming task, you$$ll write a simple Python script to read a file a process the

data contained in the file.

Throughout the programming aspect of the unit, numerous files will be provided, each

requiring a different method of interpretation. As an introduction to the unit, you will be

required to write a program that can parse a simple text file of the following format:

Melbourne

Melbourne

Brisbane

Sydney

Brisbane

Newcastle

$878-1$

$780$

$713$

$1374$

$618$

Where each segment of information is delimited by a single space. The columns represent

the following information:

$1.$ The city to travel from

$2.$ The city to travel to

$3.$ The actual distance between the cities $(-1$ indicates direct driving between the

cities is not possible$)$

$4.$ The straight$-$line distance to the destination

Information about each pair of cities should be read in and parsed and stored in

appropriate data structures. In particular, a Python dictionary should be created so that the

key is a city name $($e$.$g$.,$Melbourne$)$ and the value is a list of cities whose information

can be extracted from the input text file $-$ e$.$g$.,[($Sydney$,878,713),($Brisbane$,-1,$

$1374)].$

import sys

print$(\text{'}$Number of arguments:$\text{'},$ len$($sys$.$argv$),$ 'arguments.$\text{'})$

print$(\text{'}$Argument List:$\text{'},$ str$($sys$.$argv$))$

filename $=$ sys$.$argv$[1]$

country$\_$map $=\{\}$

with open$($filename$)$ as f:

for line in f:

content $=$ line.strip$()$

content$\_$list $=$ content.split$("")$

city$1=$ content$\_$list$[0]$

city$2=$ content$\_$list$[1]$

drivingD $=$ content$\_$list$[2]$

straightD $=$ content$\_$list$[3]$

if country$\_$map.get$($city$1)$:

city$1\_$list $=$ country$\_$map.get$($city$1)$

city$1\_$list.append$(($city$2,$ int$($drivingD$),$ int$($straightD$)))$

country$\_$map.update$(\{$city$1$: city$1\_$list$\})$

else:

country$\_$map.update$(\{$city$1$: $[($city$2,$ int$($drivingD$),$ int$($straightD$))]\})$

if country$\_$map.get$($city$2)$:

city$2\_$list $=$ country$\_$map.get$($city$2)$

city$2\_$list.append$(($city$1,$ int$($drivingD$),$ int$($straightD$)))$

country$\_$map.update$(\{$city$2$: city$2\_$list$\})$

else:

country$\_$map.update$(\{$city$2$: $[($city$1,$ int$($drivingD$),$ int$($straightD$))]\})$

print$($country$\_$map$)$

output below

PROBLEMS OUTPUT DEBUG CONSOLE TERMINAL

Number of arguments: $2$ arguments.

Argument List: $[\text{'}.\backslash$ai$\_$input.py$\text{'},$ 'cities.txt$\text{'}]$ 'Newcastle': $[(\text{'}$Brisbane$\text{'},780,618)]\}$