四、python——字典

alien_0 = {'color': 'green', 'points': 5}
print(alien_0['color'])
print(alien_0['points'])
print(alien_0)
alien_0['x_position'] = 0
alien_0['y_position'] = 25
print(alien_0)
alien_0['color'] = 'yellow'
print(alien_0)

alien_0 = {'x_position': 0, 'y_position': 25, 'speed': 'medium', "points": 5}
print("Original x-position: " + str(alien_0['x_position']))
# 向右移动外星人
# 据外星人当前速度决定将其移动多远
if alien_0['speed'] == 'slow':
    x_increment = 1
elif alien_0['speed'] == 'medium':
    x_increment = 2
else:
    # 这个外星人的速度一定很快
    x_increment = 3
# 新位置等于老位置加上增量
alien_0['x_position'] = alien_0['x_position'] + x_increment
print("New x-position: " + str(alien_0['x_position']))
# 删除键—值对
print(alien_0)
del alien_0["points"]
print(alien_0)
# 即便遍历字典时，键—值对的返回顺序也与存储顺序不同。
# Python不关心键—值对的存储顺序，而只跟踪键和值之间的关联关系。
favorite_languages = {
    'jen': 'python',
    'sarah': 'c',
    'phil': 'python',
    'edward': 'ruby',
}
# 遍历所有的键—值对
for key, val in favorite_languages.items():
    print(key.title() + "'s favorite language is " + val.title() + ".")
#  遍历字典中的所有键
for key in favorite_languages.keys():
    print(key.title())

# 确定Erin是否接受了调查  not in表示不在
if 'erin' not in favorite_languages.keys():
    print("Erin, please take our poll!")
print(favorite_languages.keys())

#  遍历字典中的所有值
print("\nThe following languages have been mentioned:")
for value in favorite_languages.values():
    print(value.title())
#  set去重
print("\nThe following languages have been mentioned:")
for value in set(favorite_languages.values()):
    print(value.title())

# 字典列表
aliens = []
for alien_number in range(0, 30):
    aliens.append({"color": "green", "speed": "slow", "points": 5})
for alien in aliens[0:3]:
    if alien["color"] == "green":
        alien["color"] = 'yellow'
        alien["speed"] = 'medium'
        alien["points"] = 10
for alien in aliens[0:5]:
    print(alien)
print("...")

# 在字典中存储列表
pizza = {
    'crust': 'thick',
    'toppings': ['mushrooms', 'extra cheese'],
}
print("You ordered a " + pizza['crust'] + "-crust pizza " +
      "with the following toppings:")
for topping in pizza['toppings']:
    print("\t" + topping)

favorite_languages = {
    'jen': ['python', 'ruby'],
    'sarah': ['c'],
    'edward': ['ruby', 'go'],
    'phil': ['python', 'haskell'],
}
for name, languages in favorite_languages.items():
    print("\n" + name.title() + "'s favorite languages are:")
    for language in languages:
        print("\t" + language.title())

# 在字典中存储字典
users = {
    'aeinstein': {
        'first': 'albert',
        'last': 'einstein',
        'location': 'princeton',
    },
    'mcurie': {
        'first': 'marie',
        'last': 'curie',
        'location': 'paris',
    },
}
for key, val in users.items():
    print('Username:' + key)
    full_name = val['first'] + " " + val['last']
    print('\t' + full_name.title())
    print('\tLocation:' + val['location'].title())

 

alien_0 = {'color': 'green', 'points': 5}

print(alien_0['color'])

print(alien_0['points'])

print(alien_0)

alien_0['x_position'] = 0

alien_0['y_position'] = 25

print(alien_0)

alien_0['color'] = 'yellow'

print(alien_0)

alien_0 = {'x_position': 0, 'y_position': 25, 'speed': 'medium', "points": 5}

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

# 向右移动外星人

# 据外星人当前速度决定将其移动多远

if alien_0['speed'] == 'slow':

    x_increment = 1

elif alien_0['speed'] == 'medium':

    x_increment = 2

else:

    # 这个外星人的速度一定很快

    x_increment = 3

# 新位置等于老位置加上增量

alien_0['x_position'] = alien_0['x_position'] + x_increment

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

# 删除键—值对

print(alien_0)

del alien_0["points"]

print(alien_0)

# 即便遍历字典时，键—值对的返回顺序也与存储顺序不同。

# Python不关心键—值对的存储顺序，而只跟踪键和值之间的关联关系。

favorite_languages = {

    'jen': 'python',

    'sarah': 'c',

    'phil': 'python',

    'edward': 'ruby',

}

# 遍历所有的键—值对

for key, val in favorite_languages.items():

    print(key.title() + "'s favorite language is " + val.title() + ".")

#  遍历字典中的所有键

for key in favorite_languages.keys():

    print(key.title())

# 确定Erin是否接受了调查  not in表示不在

if 'erin' not in favorite_languages.keys():

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

print(favorite_languages.keys())

#  遍历字典中的所有值

print("\nThe following languages have been mentioned:")

for value in favorite_languages.values():

    print(value.title())

#  set去重

print("\nThe following languages have been mentioned:")

for value in set(favorite_languages.values()):

    print(value.title())

# 字典列表

aliens = []

for alien_number in range(0, 30):

    aliens.append({"color": "green", "speed": "slow", "points": 5})

for alien in aliens[0:3]:

    if alien["color"] == "green":

        alien["color"] = 'yellow'

        alien["speed"] = 'medium'

        alien["points"] = 10

for alien in aliens[0:5]:

    print(alien)

print("...")

# 在字典中存储列表

pizza = {

    'crust': 'thick',

    'toppings': ['mushrooms', 'extra cheese'],

}

print("You ordered a " + pizza['crust'] + "-crust pizza " +

      "with the following toppings:")

for topping in pizza['toppings']:

    print("\t" + topping)

favorite_languages = {

    'jen': ['python', 'ruby'],

    'sarah': ['c'],

    'edward': ['ruby', 'go'],

    'phil': ['python', 'haskell'],

}

for name, languages in favorite_languages.items():

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

    for language in languages:

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

# 在字典中存储字典

users = {

    'aeinstein': {

        'first': 'albert',

        'last': 'einstein',

        'location': 'princeton',

    },

    'mcurie': {

        'first': 'marie',

        'last': 'curie',

        'location': 'paris',

    },

}

for key, val in users.items():

    print('Username:' + key)

    full_name = val['first'] + " " + val['last']

    print('\t' + full_name.title())

    print('\tLocation:' + val['location'].title())