Do not add import statements # For simplicity, we'll use "Station" in our type contracts to indicate that# we mean a list containing station data.## You can read "Station" in a type contract as:List[int, str, float, float, int, int, int]### where the values at each index represent the station data as described in the# handout on Quercus.# A set of constants, each representing a list index for station information.ID = 0NAME = 1LATITUDE = 2LONGITUDE = 3САРАСІTY - 4BIKES_AVAILABLE = 5DOCKS_AVAILABLE = 6NO_KIOSK = 'SMART'# For use in the get_lat_lon_distance helper functionEARTH_RADIUS = 6371# SAMPLE DATA TO USE IN DOCSTRING EXAMPLESSAMPLE_STATIONS = [[7090, 'Danforth Ave / Lamb Ave',43.681991, -79.329455, 15, 4, 10],[7486, 'Gerrard St E / Ted Reeve Dr',43.684261, -79.299332, 24, 5, 19],[7571, 'Highfield Rd / Gerrard St E - SMART',43.671685, -79.325176, 19, 14, 5]]HANDOUT_STATIONS = [[7000, 'Ft. York / Capreol Crt.',43.639832, -79.395954, 31, 20, 11],[7001, 'Lower Jarvis St SMART / The Esplanade',43.647992, -79.370907, 15, 5, 10]] def rent_bike (station_id: int, stations: List["Station"]) -> bool:"""Update the available bike count and the docks available countfor the station in stations with id station_id as if a single bike wasremoved, leaving an additional dock available. Return True if and onlyif the rental was successful.Precondition: station_id will appear in stations.>>> with_bike_station = [7090, 'Danforth Ave / Lamb Ave', \43.681991, -79.329455, 15, 4, 10]>>> station_id = with_bike_station[ID]>>> original_bikes_available = with_bike_station[BIKES_AVAILABLE]>>> original_docks_available>>> rent_bike(station_id, [with_bike_station])with_bike_station[DOCKS_AVAILABLE]True>>> original_bikes_available1 ==with_bike_station[BIKES_AVAILABLE]-True>>> original_docks_available + 1 ==with_bike_station[DOCKS_AVAILABLE]True>>> no_bike_station43.681991, -79.329455, 15, 0, 15]>>> station_id = no_bike_station[ID]>>> original_bikes_available = no_bike_station[BIKES_AVAILABLE]>>> original_docks_available>>> rent_bike(station_id, [no_bike_station])[7090, 'Danforth Ave / Lamb Ave', \no_bike_station[DOCKS_AVAILABLE]False>>> original_bikes_availableno_bike_station[BIKES_AVAILABLE]==True>>> original_docks_availableno_bike_station[DOCKS_AVAILABLE]True

# For simplicity, we'll use "Station" in our type contracts to indicate that # we mean a list containing station data. # You can read "Station" in a type contract as: List[int, str, float, float, int, int, int] # # where the values at each index represent the station data as described in the # handout on Quercus. # A set of constants, each representing a list index for station information. ID = 0 NAME = 1 LATITUDE = 2 LONGITUDE = 3 CAPACITY = 4 BIKES_AVAILABLE = 5 DOCKS_AVAILABLE = 6 NO_KIOSK = ' SMART' # For use in the get_lat_lon_distance helper function EARTH_RADIUS = 6371 # SAMPLE DATA TO USE IN DOCSTRING EXAMPLES SAMPLE_STATIONS = [ [7090, 'Danforth Ave / Lamb Ave', 43.681991, -79.329455, 15, 4, 10], [7486, 'Gerrard St E / Ted Reeve Dr', 43.684261, -79.299332, 24, 5, 19], [7571, 'Highfield Rd / Gerrard St E - SMART', 43.671685, -79.325176, 19, 14, 5]] HANDOUT_STATIONS = [ [7000, 'Ft. York / Capreol Crt.', 43.639832, -79.395954, 31, 20, 11], [7001, 'Lower Jarvis St SMART / The Esplanade', 43.647992, -79.370907, 15, 5, 10]]

# For simplicity, we'll use "Station" in our type contracts to indicate that # we mean a list containing station data. # You can read "Station" in a type contract as: List[int, str, float, float, int, int, int] # # where the values at each index represent the station data as described in the # handout on Quercus. # A set of constants, each representing a list index for station information. ID = 0 NAME = 1 LATITUDE = 2 LONGITUDE = 3 CAPACITY = 4 BIKES_AVAILABLE = 5 DOCKS_AVAILABLE = 6 NO_KIOSK = ' SMART' # For use in the get_lat_lon_distance helper function EARTH_RADIUS = 6371 # SAMPLE DATA TO USE IN DOCSTRING EXAMPLES SAMPLE_STATIONS = [ [7090, 'Danforth Ave / Lamb Ave', 43.681991, -79.329455, 15, 4, 10], [7486, 'Gerrard St E / Ted Reeve Dr', 43.684261, -79.299332, 24, 5, 19], [7571, 'Highfield Rd / Gerrard St E - SMART', 43.671685, -79.325176, 19, 14, 5]] HANDOUT_STATIONS = [ [7000, 'Ft. York / Capreol Crt.', 43.639832, -79.395954, 31, 20, 11], [7001, 'Lower Jarvis St SMART / The Esplanade', 43.647992, -79.370907, 15, 5, 10]]

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

Do not add import statements

# For simplicity, we'll use "Station" in our type contracts to indicate that
# we mean a list containing station data.
#
# You can read "Station" in a type contract as:
List[int, str, float, float, int, int, int]
#
#
# where the values at each index represent the station data as described in the
# handout on Quercus.
# A set of constants, each representing a list index for station information.
ID = 0
NAME = 1
LATITUDE = 2
LONGITUDE = 3
САРАСІTY - 4
BIKES_AVAILABLE = 5
DOCKS_AVAILABLE = 6
NO_KIOSK = 'SMART'
# For use in the get_lat_lon_distance helper function
EARTH_RADIUS = 6371
# SAMPLE DATA TO USE IN DOCSTRING EXAMPLES
SAMPLE_STATIONS = [
[7090, 'Danforth Ave / Lamb Ave',
43.681991, -79.329455, 15, 4, 10],
[7486, 'Gerrard St E / Ted Reeve Dr',
43.684261, -79.299332, 24, 5, 19],
[7571, 'Highfield Rd / Gerrard St E - SMART',
43.671685, -79.325176, 19, 14, 5]]
HANDOUT_STATIONS = [
[7000, 'Ft. York / Capreol Crt.',
43.639832, -79.395954, 31, 20, 11],
[7001, 'Lower Jarvis St SMART / The Esplanade',
43.647992, -79.370907, 15, 5, 10]]

def rent_bike (station_id: int, stations: List["Station"]) -> bool:
"""Update the available bike count and the docks available count
for the station in stations with id station_id as if a single bike was
removed, leaving an additional dock available. Return True if and only
if the rental was successful.
Precondition: station_id will appear in stations.
>>> with_bike_station = [7090, 'Danforth Ave / Lamb Ave', \
43.681991, -79.329455, 15, 4, 10]
>>> station_id = with_bike_station[ID]
>>> original_bikes_available = with_bike_station[BIKES_AVAILABLE]
>>> original_docks_available
>>> rent_bike(station_id, [with_bike_station])
with_bike_station[DOCKS_AVAILABLE]
True
>>> original_bikes_available
1 ==
with_bike_station[BIKES_AVAILABLE]
-
True
>>> original_docks_available + 1 ==
with_bike_station[DOCKS_AVAILABLE]
True
>>> no_bike_station
43.681991, -79.329455, 15, 0, 15]
>>> station_id = no_bike_station[ID]
>>> original_bikes_available = no_bike_station[BIKES_AVAILABLE]
>>> original_docks_available
>>> rent_bike(station_id, [no_bike_station])
[7090, 'Danforth Ave / Lamb Ave', \
no_bike_station[DOCKS_AVAILABLE]
False
>>> original_bikes_available
no_bike_station[BIKES_AVAILABLE]
==
True
>>> original_docks_available
no_bike_station[DOCKS_AVAILABLE]
True

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