字典简介2
当用于表示更大的相关数据块时，字典就显得特别有用。下面的图片显示了来自名为Jira的票务软件的更真实的“票（ticket）”。
让我们来看一看！
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# Note how the structure of a ticket is captured in the
ticket = {
"type" : "bug",
"status": "done",
"priority": "medium",
"resolution": "done",
"description" : "testing 123",
"attachments" : [],
"people": {
"assignee" : None,
"reporter" : {
"name" : "Andy Brown",
"image": "www.example_image_url.com"
},
"votes" : 0,
"watchers" : [
{
"name": "Andy Brown",
"image": "www.example_image_url.com"
}
]
},
"dates" : {
"created" : "6 days ago",
"updated" : "6 days ago",
"resolved": "6 days ago"
}
}
# In this example, ticket is a dictionary with the following "keys":
print("The keys for this dictionary are...")
ticket.keys()
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# notice how nicely the following code reads...
ticket['people']['reporter']['name']
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# let's pull in a bunch of "dummy" data
from sample_data import big_tickets
import random
print("there are", len(big_tickets), "big tickets")
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# grab a random ticket and take a look at it
random_ticket = random.choice(big_tickets)
random_ticket
TODO - 练习 - 查找所有包含8位以上观众的票
列表和字典可以很好地协同工作。请注意，在上面显示的随机票中，people字段代表一个词典。 该字典包含其他数据，包括其关联值为一个列表的一个watchers关键字。
在本练习中，你将对250张票（每个门票对应一个词典）的列表进行过滤，最后只列出最受欢迎的票（由观看人数定义）的一个较小列表。
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def get_popular_tickets(tickets):
"""
From a list of tickets, fetch all the tickets with 8 or
more "watchers".
"""
popular_tickets = []
#
# TODO - your code here
#
return popular_tickets
popular = get_popular_tickets(big_tickets)
# TESTING CODE
assert( len(popular) > 0 ) # must be at least one popular ticket
for ticket in popular:
assert( len(ticket['people']['watchers']) >= 8 )
print("Nice job! It looks like your function is working.")
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#
#
#
#
#
# Spoiler alert! Try to avoid looking at the solution until you've
# attempted the problem yourself.
#
#
#
def get_popular_tickets_solution(tickets):
"""
From a list of tickets, fetch all the tickets with 8 or
more "watchers".
"""
popular_tickets = []
for ticket in tickets:
num_watchers = len(ticket['people']['watchers'])
if num_watchers >= 8:
popular_tickets.append(ticket)
return popular_tickets
