本文实例总结了Python字典常见操作。分享给大家供大家参考,具体如下:简单的字典:字典
本文实例总结了Python字典常见操作。分享给大家供大家参考,具体如下:
简单的字典:
字典就是键值对key-value组合。
#字典 键值对组合
alien_0 ={'color':'green','number':5}
print(alien_0['color'])
print(alien_0['number'])
运行结果:
green 5
添加键值对
alien_0 ={'color':'green','number':5}
alien_0['first_name'] = 'mo'
alien_0['last_name'] = 'ak'
print(alien_0)
运行结果:
{'color': 'green', 'number': 5, 'first_name': 'mo', 'last_name': 'ak'}
使用字典:
#访问元素
favorite_languages ={
'jen':'python',
'sarah':'c',
'edwoad':'ruby',
'phil':'python',
}
print(favorite_languages['jen'])
#删除键值对
del favorite_languages['phil']
print(favorite_languages)
运行结果:
python {'jen': 'python', 'sarah': 'c', 'edwoad': 'ruby'}
遍历字典:
favorite_numbers = {
'mx' : '6',
'cg' : '365',
'zxp': '8',
}
for key,value in favorite_numbers.items():
print("\nkey:"+key)
print("value:"+value)
运行结果:
key:mx value:6
key:cg value:365
key:zxp value:8
遍历字典中的所有键:
favorite_numbers = {
'mx' : '6',
'cg' : '365',
'zxp': '8',
}
for name in favorite_numbers.keys():
print(name.title())
运行结果:
Mx Cg Zxp
嵌套:
#字典列表:
alien_0 = {'color':'green','points':5}
alien_1 = {'color':'red','points':6}
alien_2 = {'color':'blue','points':3}
aliens = [alien_0,alien_1,alien_2]
for alien in aliens:
print(alien)
#字典中存储列表:
favorite_language ={
'jen':['python','c'],
'mx':['java','python'],
}
for name,languages in favorite_language.items():
print("\n\t"+name+str(languages))
for language in languages:
print(language)
运行结果:
{'color': 'green', 'points': 5} {'color': 'red', 'points': 6} {'color': 'blue', 'points': 3}
jen['python', 'c'] python c
mx['java', 'python'] java python
#字典中存储字典: #暂略
Python 字典 常见操作 定义 添加 删除 遍历