四、python——字典

标签：languages title python favorite alien print position 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())

标签：languages,title,python,favorite,alien,print,position,字典
From： https://www.cnblogs.com/sxww-zyt/p/17094876.html