Python weekend entry task

Welcome to Europython! To experience the attendee selection process for Kiwi.com Python Weekend and win some flight vouchers for your next trip, you can try solving this entry task and receiving feedback. Just email the solution in a zip file to lukas.kubis@kiwi.com with the subject starting with PW. Happy coding!

Assignment

Write a python script/module/package, that for a given flight data in a form of csv file (check the examples), prints out a structured list of all flight combinations for a selected route between airports A -> B, sorted by the final price for the trip.

Description

You've been provided with some semi-randomly generated example csv datasets you can use to test your solution. The datasets have following columns:

• flight_no: Flight number.
• origin, destination: Airport codes.
• departure, arrival: Dates and times of the departures/arrivals.
• base_price, bag_price: Prices of the ticket and one piece of baggage.
• bags_allowed: Number of allowed pieces of baggage for the flight.

In addition to the dataset, your script will take some additional arguments as input:

Argument name	type	Description	Notes
origin	string	Origin airport code
destination	string	Destination airport code

Search restrictions

• By default you're performing search on ALL available combinations, according to search parameters.
• In case of a combination of A -> B -> C, the layover time in B should not be less than 1 hour and more than 6 hours.
• No repeating airports in the same trip!
  • A -> B -> A -> C is not a valid combination for search A -> C.
• Output is sorted by the final price of the trip.

Optional arguments

You may add any number of additional search parameters to boost your chances to attend. Here are 2 recommended ones:

Argument name	type	Description	Notes
bags	integer	Number of requested bags	Optional (defaults to 0)
return	boolean	Is it a return flight?	Optional (defaults to false)

Performing return trip search

Example input (assuming solution.py is the main module):

python -m solution example/example0.csv RFZ WIW --bags=1 --return

will perform a search RFZ -> WIW -> RFZ for flights which allow at least 1 piece of baggage.

• NOTE: Since WIW is in this case the final destination for one part of the trip, the layover rule does not apply.

Output

The output will be a json-compatible structured list of trips sorted by price. The trip has the following schema:

Field	Description
flights	A list of flights in the trip according to the input dataset.
origin	Origin airport of the trip.
destination	The final destination of the trip.
bags_allowed	The number of allowed bags for the trip.
bags_count	The searched number of bags.
total_price	The total price for the trip.
travel_time	The total travel time.

For more information, check the example section.

Points of interest

Assuming your solution is working, we'll be additionally judging based on following skills:

• input, output - what if we input garbage?
• modules, packages & code structure (hint: it's easy to overdo it)
• usage of standard library and built-in data structures
• code readability, clarity, used conventions, documentation and comments

Requirements and restrictions

• Your solution needs to contain a README file describing what it does and how to run it.
• Only the standard library is allowed, no 3rd party packages, notebooks, specialized distros (Conda) etc.
• The code should run as is, no environment setup should be required.

Example behaviour

Let's imagine we wrote our solution into one file, solution.py and our datatset is in data.csv. We want to test the script by performing a flight search on route BTW -> REJ (we know the airports are present in the dataset) with one bag. We run the thing:

python -m solution data.csv BTW REJ --bags=1

and get the following result:

[
    {
        "flights": [
            {
                "flight_no": "XC233",
                "origin": "BTW",
                "destination": "WTF",
                "departure": "2021-09-02T05:50:00",
                "arrival": "2021-09-02T8:20:00",
                "base_price": 67.0,
                "bag_price": 7.0,
                "bags_allowed": 2
            },
            {
                "flight_no": "VJ832",
                "origin": "WTF",
                "destination": "REJ",
                "departure": "2021-09-02T11:05:00",
                "arrival": "2021-09-02T12:45:00",
                "base_price": 31.0,
                "bag_price": 5.0,
                "bags_allowed": 1
            }
        ],
        "bags_allowed": 1,
        "bags_count": 1,
        "destination": "REJ",
        "origin": "BTW",
        "total_price": 110.0,
        "travel_time": "6:55:00"
    },
    {
        "flights": [
            {
                "flight_no": "JV042",
                "origin": "BTW",
                "destination": "REJ",
                "departure": "2021-09-01T17:35:00",
                "arrival": "2021-09-01T21:05:00",
                "base_price": 216.0,
                "bag_price": 11.0,
                "bags_allowed": 2
            }
        ],
        "bags_allowed": 2,
        "bags_count": 1,
        "destination": "REJ",
        "origin": "BTW",
        "total_price": 227.0,
        "travel_time": "3:30:00"
    }
]