The

airline.py program $($attached$)$ creates a dictionary of flights $($a mix of regular, business and

first$-$class flights$)$ and displays their corresponding information. Flight information is provided

by the "airfare.txt$",$ where flights are randomly upgraded or not to Business or FirstClass

flights. Write the missing code, in the #TODO locations of the classes Flight, Business and

FirstClass, in order for the program execution to display the details of flights stored in the

dictionary as illustrated by the sample output. Since the "points" and "meals" attributes for

Business and FirstClass objects are randomly assigned, every program run will yield different

values for these attributes. However, all other flight attributes will be the same for all program

executions, since the information is loaded from the same input file "airfare.txt$".$

Sample of expected program output using the "airfare.txt$"$ file as input.

PLEASE ONLY FILL #TODO PART. PLEASE DO NOT MAKE ANY CHANGES TO OTHER PARTS OF THE CODE.

import random

class Flight:

def $\_\_$init$\_\_($self$,$dtime,origin,destination,fare$)$:

self.dtime $=$ dtime

self.origin $=$ origin

self.destination $=$ destination

self.fare $=$ fare

#TODO

class BusinessFlight$($Flight$)$:

def $\_\_$init$\_\_($self$,$points,$*$args$,**$kwargs$)$:

self.points $=$ points

super $($BusinessFlight$,$self$).\_\_$init$\_\_($args$,**$kwargs$)$

#TODO

class Firstclass$($Flight$)$:

def $\_\_$init$\_\_($self$,$meals,$*$args$,**$kwargs$)$:

self.meals $=$ meals

super $($FirstClass$,$self$).\_\_$init$\_\_(*$args$,**$kwargs$)$

#TODO

def read$\_$records$($fname$)$:

data $=$ dict$()$

try:

with open$($fnane$,\text{'}$r$\text{'})$ as hd:

for line in hd:

f $=$ line.split$(\text{'},\text{'})$

if len$($f$)!=4$:

continue

f $=$ line.split$(\text{'},\text{'})$

fare $=$ float$($f$[3].$strip$()[1$:$])$

dtime, origin, destination $=$ f$[0],$ f$[1],$ f$[2]$

# Ungrade $($randonly$)$ to Business or First class

rd$=$ int$($fare$)$

nb $=$ rd $\%3$

if nb $==0$:

mls $=$ random.randint$(1,4)$

obj $=$ Firstclass$($mls$,$dtime, origin, destination, fare$)$

elif nb $==1$:

pts $=$ random.randint$(10,$rd$)$

obj $=$ BusinessFlight$($pts$,$dtime, origin, destination,fare$)$

else:

obj $=$ Flight$($dtime$,$ origin, destination, fare$)$

data$[$dtime$]=$ obj

except Exception as e:

print$($e$)$

return data

data $=$ read$\_$records$("$airfares$.$txt$")$

dtimes $=$ list$($data$.$keys$())$

dtimes.sort$()$

for dt in dtimes$()$:

print$($data$[$dt$].$info$())$