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())
