python的字典

创建

alien_0 = {}
alien_0[‘color’] = ‘green’
alien_0[‘points’] = 5
alien_0 = {‘color’: ‘green’, ‘points’: 5, ‘age’ : 18}

查询

print(alien_0[‘color’])
print(alien_0[‘points’])
print(alien_0[‘age’])

添加

alien_0[‘x_position’] = 0
alien_0[‘y_positin’] = 5
print(alien_0)

修改

alien_0[‘color’] = ‘green’

print(alien_0)

删除

del alien_0[‘points’]
print(alien_0)

遍历

for key, value in alien_0.items():
print(’\nKey:’ + key)
print(‘Value:{}’.format(value))

print(’\n’)
for key in alien_0:
print(key)

print(’\n’)

for key in alien_0.keys():
print(key)

for value in alien_0.values():
print(value)

set()来排重

alien_0[‘frind_color’] = ‘green’
print(alien_0)

for value in set(alien_0.values()):
print(value)

在字典中储存列表

pizza = {
‘crust’ : ‘thick’,
‘toppings’: [‘mushrooms’, ‘extra cheese’],
}

for topping in pizza[‘toppings’]:
print("\t" + topping)