第六章 字典

01 alien_0 = {‘color‘: ‘green‘, ‘points‘: 5}

02 print(alien_0)

03 alien_0[‘x_position‘] = 0

04 alien_0[‘y_position‘] = 25

05 print(alien_0)

>>>

{‘color‘: ‘green‘, ‘points‘: 5}

{‘color‘: ‘green‘, ‘points‘: 5, ‘x_position‘: 0, ‘y_position‘: 25}

01 #1

02 alien_0 = {‘color‘: ‘green‘}

03 print("The alien is " + alien_0[‘color‘] + ".")

04 alien_0[‘color‘] = ‘yellow‘

05 print("The alien is now " + alien_0[‘color‘] + ".")

06

07 #2

08 alien_0 = {‘x_position‘: 0, ‘y_position‘: 25, ‘speed‘: ‘medium‘}

09 print("Original x-position: " + str(alien_0[‘x_position‘]))

10 # 向右移动外星人

11 # 据外星人当前速度决定将其移动多远

12 if alien_0[‘speed‘] == ‘slow‘:

13 x_increment = 1

14 elif alien_0[‘speed‘] == ‘medium‘:

15 x_increment = 2

16 else:

17 # 这个外星人的速度一定很快

18 x_increment = 3

19 # 新位置等于老位置加上增量

20 alien_0[‘x_position‘] = alien_0[‘x_position‘] + x_increment

21 print("New x-position: " + str(alien_0[‘x_position‘]))

>>>

The alien is green.

The alien is now yellow.

Original x-position: 0

New x-position: 2

01 favorite_language={

02 ‘jen‘:‘Python‘,

03 ‘sarah‘:‘c‘,

04 ‘edward‘:‘Ruby‘,

05 ‘phil‘:‘Python‘,

06 }

07 print("Sarah‘s favorite language is "+

08 favorite_language[‘sarah‘].title()+

09 ‘.‘)

>>>

Sarah‘s favorite language is C.

01 favorite_languages={

02 ‘jen‘:‘Python‘,

03 ‘sarah‘:‘c‘,

04 ‘edward‘:‘Ruby‘,

05 ‘phil‘:‘Python‘,

06 }

07 for name,language in favorite_languages.items():

08 print(name.title()+"‘sfavorite language is "+

09 language.title()+".")

>>>

Jen‘sfavorite language is Python.

Sarah‘sfavorite language is C.

Edward‘sfavorite language is Ruby.

Phil‘sfavorite language is Python.

01 favorite_languages={

02 ‘jen‘:‘Python‘,

03 ‘sarah‘:‘c‘,

04 ‘edward‘:‘Ruby‘,

05 ‘phil‘:‘Python‘,

06 }

07 for name in favorite_languages.keys():

08 print(name.title())

09

10 if ‘erin‘ not in favorite_languages.keys():

11 print("Erin, please take our poll!")

>>>

Jen

Sarah

Edward

Phil

Erin, please take our poll!

01 favorite_languages={

02 ‘jen‘:‘Python‘,

03 ‘sarah‘:‘c‘,

04 ‘edward‘:‘Ruby‘,

05 ‘phil‘:‘Python‘,

06 }

07 for name in sorted(favorite_languages.keys()):

08 print(name.title() + ", thank you for taking the poll.")

>>>

Edward, thank you for taking the poll.

Jen, thank you for taking the poll.

Phil, thank you for taking the poll.

Sarah, thank you for taking the poll.

01 favorite_languages={

02 ‘jen‘:‘Python‘,

03 ‘sarah‘:‘c‘,

04 ‘edward‘:‘Ruby‘,

05 ‘phil‘:‘Python‘,

06 }

07

08 # 利用方法values()遍历所有值

09 print("the following language have been mentioned:");

10 for language in favorite_languages.values():

11 print(language.title());

12

13 print("\n");

14 # 利用函数list()去掉列表中的重复性元素

15 for language in set(favorite_languages.values()):

16 print(language.title())

>>>

the following language have been mentioned:

Python

C

Ruby

Python

? ?

? ?

C

Python

Ruby

01 alien_0 = {‘color‘: ‘green‘, ‘points‘: 5}

02 alien_1 = {‘color‘: ‘yellow‘, ‘points‘: 10}

03 alien_2 = {‘color‘: ‘red‘, ‘points‘: 15}

04 aliens = [alien_0, alien_1, alien_2]

05 for alien in aliens:

06 print(alien)

07

08 #创建一个用于存储外星人的空列表

09 aliens = []

10 # 创建30个绿色的外星人

11 for alien_number in range(30):

12 new_alien = {‘color‘: ‘green‘, ‘points‘: 5, ‘speed‘: ‘slow‘}

13 aliens.append(new_alien)

14 # 显示前五个外星人

15 for alien in aliens[:5]:

16 print(alien)

17 print("...")# 显示创建了多少个外星人

18 print("Total number of aliens: " + str(len(aliens)))

19

20 # try2

21 for alien in aliens[0:3]:

22 if alien[‘color‘] == ‘green‘:

23 alien[‘color‘] = ‘yellow‘

24 alien[‘speed‘] = ‘medium‘

25 alien[‘points‘] = 10

26 # 显示前五个外星人

27 for alien in aliens[0:5]:

28 print(alien)

29 print("...")

>>>

{‘color‘: ‘green‘, ‘points‘: 5}

{‘color‘: ‘yellow‘, ‘points‘: 10}

{‘color‘: ‘red‘, ‘points‘: 15}

{‘color‘: ‘green‘, ‘points‘: 5, ‘speed‘: ‘slow‘}

{‘color‘: ‘green‘, ‘points‘: 5, ‘speed‘: ‘slow‘}

{‘color‘: ‘green‘, ‘points‘: 5, ‘speed‘: ‘slow‘}

{‘color‘: ‘green‘, ‘points‘: 5, ‘speed‘: ‘slow‘}

{‘color‘: ‘green‘, ‘points‘: 5, ‘speed‘: ‘slow‘}

...

Total number of aliens: 30

{‘color‘: ‘yellow‘, ‘points‘: 10, ‘speed‘: ‘medium‘}

{‘color‘: ‘yellow‘, ‘points‘: 10, ‘speed‘: ‘medium‘}

{‘color‘: ‘yellow‘, ‘points‘: 10, ‘speed‘: ‘medium‘}

{‘color‘: ‘green‘, ‘points‘: 5, ‘speed‘: ‘slow‘}

{‘color‘: ‘green‘, ‘points‘: 5, ‘speed‘: ‘slow‘}

...

01 favorite_languages = {

02 ‘jen‘: [‘python‘, ‘ruby‘],

03 ‘sarah‘: [‘c‘],

04 ‘edward‘: [‘ruby‘, ‘go‘],

05 ‘phil‘: [‘python‘, ‘haskell‘],

06 }

07 for name, languages in favorite_languages.items():

08 print("\n" + name.title() + "‘s favorite languages are:")

09 for language in languages:

10 print("\t" + language.title())

>>>

Jen‘s favorite languages are:

Python

Ruby

? ?

Sarah‘s favorite languages are:

C

? ?

Edward‘s favorite languages are:

Ruby

Go

? ?

Phil‘s favorite languages are:

Python

Haskell

01 users = {

02 ‘aeinstein‘:

03 {

04 ‘first‘: ‘albert‘,

05 ‘last‘: ‘einstein‘,

06 ‘location‘: ‘princeton‘,

07 },

08 ‘mcurie‘:

09 {

10 ‘first‘: ‘marie‘,

11 ‘last‘: ‘curie‘,

12 ‘location‘: ‘paris‘,

13 },

14 }

15 for username, user_info in users.items():

16 print("\nUsername: " + username)

17 full_name = user_info[‘first‘] + " " + user_info[‘last‘]

18 location = user_info[‘location‘]

19 print("\tFull name: " + full_name.title())

20 print("\tLocation: " + location.title())

>>>

Username: aeinstein

Full name: Albert Einstein

Location: Princeton

? ?

Username: mcurie

Full name: Marie Curie

Location: Paris

01 cities={};

02 cities={

03 ‘Beijing‘:

04 {

05 ‘Contry‘:‘China‘,

06 ‘population‘:‘138,000‘,

07 ‘fact‘:‘the biggest city in china‘,

08 },

09 ‘NewYork‘:

10 {

11 ‘Contry‘:‘the U.S‘,

12 ‘population‘:‘800,000‘,

13 ‘fact‘:‘the capital of the U.S ‘,

14 },

15 ‘Tokyo‘:

16 {

17 ‘Contry‘:‘Japan‘,

18 ‘population‘:‘50,000‘,

19 ‘fact‘:‘an island contry ‘,

20 },

21 };

22 for city,city_info in cities.items():

23 print(city);

24 for key,detail in city_info.items():

25 print("\t"+key+"\t"+detail);

>>>
?

Beijing

Contry????????China

population????????138,000

fact????????the biggest city in china

NewYork

Contry????????the U.S

population????????800,000

fact????????the capital of the U.S

Tokyo

Contry????????Japan

population????????50,000

fact????????an island contry