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2017-5-15 字典操作
alien_0 = {‘color‘:‘green‘,‘points‘:5}
print(alien_0[‘color‘])
print(alien_0[‘points‘]) 字典格式 key:value格式
添加键值对:
alien_0[‘x_postion‘] = 0
alien_0[‘y_postion‘] = 25
print(alien_0)
删除键值对:
del alien_0[‘points‘]
print (alien_0)
遍历字典:
for key,value in user_0.items():
print(key)
print(value)
favourite_languages = {
‘jen‘:‘python‘,
‘sarah‘:‘c‘,
‘lucy‘:‘ruby‘,
‘phil‘:‘python‘
}
for name in sorted(favourite_languages.keys()):
print(name.title() + ",thank you for taking the poll.")
字典列表:
alien_0= {‘color‘:‘green‘,‘points‘:‘5‘}
alien_1 = {‘color‘:‘yellow‘,‘points‘:‘10‘}
alien_2 = {‘color‘:‘red‘,‘points‘:‘6‘}
aliens = [alien_0,alien_1,alien_2]
for alien in aliens:
print(alien)
aliens = []
for alien_number in range(30):
new_alien = {‘color‘:‘green‘,‘points‘:5,‘speed‘:‘slow‘}
aliens.append(new_alien)
for alien in aliens[:5]:
print(alien)
print(str(len(aliens)))
pizza = {
‘crust‘:‘thick‘,
‘toppings‘:[‘extra cheese‘,‘mushrooms‘]
}
print(pizza[‘toppings‘][1])
2017-5-15 字典操作