learn-co-students / conditionals-python-lab-london-ds-100719

Conditionals in Python Lab

Introduction

In our earlier lab on functional arguments, we found ways to work with Yelp to find and compare restaurants. In this lesson, we'll add more complex methods now that we know about conditionals.

Again, our two restaurants in Albuquerque

Let's take another look at our data for a single restaurant. Once again, we have data regarding the Fork and Fig restaurant.

fork_fig = {'categories': [{'alias': 'burgers', 'title': 'Burgers'},
  {'alias': 'sandwiches', 'title': 'Sandwiches'},
  {'alias': 'salad', 'title': 'Salad'}],
 'coordinates': {'latitude': 35.10871, 'longitude': -106.56739},
 'display_phone': '[phone]',
 'distance': 3571.724649307866,
 'id': 'fork-and-fig-albuquerque',
 'image_url': 'https://s3-media1.fl.yelpcdn.com/bphoto/_-DpXKfS3jv6DyA47g6Fxg/o.jpg',
 'is_closed': False,
 'location': {'address1': '6904 Menaul Blvd NE',
  'address2': 'Ste C',
  'address3': '',
  'city': 'Albuquerque',
  'country': 'US',
  'display_address': ['6904 Menaul Blvd NE', 'Ste C', 'Albuquerque, NM 87110'],
  'state': 'NM',
  'zip_code': '87110'},
 'name': 'Fork & Fig',
 'phone': '[phone]',
 'price': '$$',
 'rating': 4.5,
 'review_count': 604,
 'transactions': [],
 'url': 'https://www.yelp.com/biz/fork-and-fig-albuquerque?adjust_creative=SYc8R4Gowqru5h4SBKZXsQ&utm_campaign=yelp_api_v3&utm_medium=api_v3_business_search&utm_source=SYc8R4Gowqru5h4SBKZXsQ'}

And here is the data representing Frontier Restaurant.

frontier_restaurant = {'categories': [{'alias': 'mexican', 'title': 'Mexican'},
  {'alias': 'diners', 'title': 'Diners'},
  {'alias': 'tradamerican', 'title': 'American (Traditional)'}],
 'coordinates': {'latitude': 35.0808088832532, 'longitude': -106.619402244687},
 'display_phone': '[phone]',
 'distance': 4033.6583235266075,
 'id': 'frontier-restaurant-albuquerque-2',
 'image_url': 'https://s3-media4.fl.yelpcdn.com/bphoto/M9L2z6-G0NobuDJ6YTh6VA/o.jpg',
 'is_closed': True,
 'location': {'address1': '2400 Central Ave SE',
  'address2': '',
  'address3': '',
  'city': 'Albuquerque',
  'country': 'US',
  'display_address': ['2400 Central Ave SE', 'Albuquerque, NM 87106'],
  'state': 'NM',
  'zip_code': '87106'},
 'name': 'Frontier Restaurant',
 'phone': '[phone]',
 'price': '$',
 'rating': 4.0,
 'review_count': 1369,
 'transactions': [],
 'url': 'https://www.yelp.com/biz/frontier-restaurant-albuquerque-2?adjust_creative=SYc8R4Gowqru5h4SBKZXsQ&utm_campaign=yelp_api_v3&utm_medium=api_v3_business_search&utm_source=SYc8R4Gowqru5h4SBKZXsQ'}

And once again, the attributes of the dictionaries above look like the following.

fork_fig.keys()

dict_keys(['categories', 'coordinates', 'display_phone', 'distance', 'id', 'image_url', 'is_closed', 'location', 'name', 'phone', 'price', 'rating', 'review_count', 'transactions', 'url'])

Writing functions with conditionals

Let's write a function called better_restaurant that provided two restaurants, returns the restaurant with the better rating. The first argument is restaurant and the second argument is alternative.

def better_restaurant(restaurant, alternative):
    pass

print(better_restaurant(frontier_restaurant, fork_fig)['name']) # 'Fork & Fig'
print(better_restaurant(fork_fig, frontier_restaurant)['name']) # 'Fork & Fig'

Let's write a function called cheaper_restaurant that returns the restaurant with the lower price, that is the restaurant that has fewer '$' signs. The first argument should be named restaurant and the second argument should be named alternative.

def cheaper_restaurant(restaurant, alternative):
    pass

print(cheaper_restaurant(fork_fig, frontier_restaurant)['name']) # 'Frontier Restaurant'
print(cheaper_restaurant(frontier_restaurant, fork_fig)['name']) # 'Frontier Restaurant'

Conditionals and Loops

Let's continue our work of conditionals by seeing how they can be combined with loops. Let's write a function called open_restaurants that takes in a list of restaurants as an argument and returns a list of only the restaurants that are not closed.

fork_fig['is_closed'] # False

frontier_restaurant['is_closed'] # True

restaurants = [fork_fig, frontier_restaurant]

def open_restaurants(restaurants):
    pass

len(open_restaurants(restaurants)) # 1

open_restaurants(restaurants)[0]['name'] # 'Fork & Fig'

Summary

Great! In this lab we saw how to use functions with multiple arguments and conditionals to return the restaurant we want based on the questions we are trying to answer. We also saw how to use conditionals to select only certain elements of an array based on a condition we want our elements to meet.