CODEWITHSUNDEEP
pythonsortingnamedtuple
anonymous fox
anonymous fox

Reputation: 39

Coding in python with a namedtuple using sort

Write a sequence of statements that prints out the list of Restaurants RC in order from least expensive to most expensive (best dish). it should use the sort(), and key=restaurant_price as an argument to sort()

Given this code:

from collections import namedtuple 
Restaurant = namedtuple('Restaurant', 'name cuisine phone dish price')
RC = [
    Restaurant("Thai Dishes", "Thai", "334-4433", "Mee Krob", 12.50),
    Restaurant("Nobu", "Japanese", "335-4433", "Natto Temaki", 5.50),
    Restaurant("Nonna", "Italian", "355-4433", "Stracotto", 25.50)]

def restaurant_price (restaurant:Restaurant)-> float:
    return restaurant.price

I wrote:

print(sort(RC,key=restaurant_price()))

My code gets an error statement of "name 'sort' is not defined"

Upvotes: 2

Views: 1777

Answers (1)

Padraic Cunningham
Padraic Cunningham

Reputation: 180481

sort is an inplace method that operates on the original list and returns None, you can use sorted:

print(sorted(RC,key=restaurant_price)) # creates new list

Using sorted:

In [23]: sorted(RC,key=restaurant_price)
Out[23]: 
[Restaurant(name='Nobu', cuisine='Japanese', phone='335-4433', dish='Natto Temaki', price=5.5),
 Restaurant(name='Thai Dishes', cuisine='Thai', phone='334-4433', dish='Mee Krob', price=12.5),
 Restaurant(name='Nonna', cuisine='Italian', phone='355-4433', dish='Stracotto', price=25.5)]

Or call .sort on the list:

RC.sort(key=restaurant_price) # sort original list 
print(RC)

.sort:

In [20]: RC.sort(key=restaurant_price)

In [21]: RC
Out[21]: 
[Restaurant(name='Nobu', cuisine='Japanese', phone='335-4433', dish='Natto Temaki', price=5.5),
 Restaurant(name='Thai Dishes', cuisine='Thai', phone='334-4433', dish='Mee Krob', price=12.5),
 Restaurant(name='Nonna', cuisine='Italian', phone='355-4433', dish='Stracotto', price=25.5)]

To just get the names:

In [24]: [x.name for x in sorted(RC,key=restaurant_price)]
Out[24]: ['Nobu', 'Thai Dishes', 'Nonna']

without using an explicit for loop loop or zip:

from operator import itemgetter
print(list(map(itemgetter(0),sorted(RC,key=restaurant_price)))
['Nobu', 'Thai Dishes', 'Nonna']

Upvotes: 4

Related Questions