dict数据类型

Posted 2020-09-02

dic = {‘a1‘: 4, 2: ‘2‘, ‘3‘: [1, 2, 3], 4: {1: 10, 2: 20}}
#dic = dict(a1=‘4‘,a2=‘5‘)

# 清空字典

dic.clear()

# 取值
print(dic[‘3‘][1])

# 后面的键会覆盖之前的重复键
print({‘a‘: 12, ‘b‘: 14, ‘a‘: 18})

# 赋值,如果键不存在,就新增这个键
dic[‘bb‘] = ‘666‘

# 设置默认值,并返回添加的键值
print(dic.setdefault(‘55‘, ‘66‘), ‘setdefault‘)

# 将序列内的元素当成key,然后依次把key和value一一对应,返回生成的新字典
print(dic.fromkeys([‘a‘, ‘b‘, ‘c‘, ‘d‘], [1, 2, 3, 4]), ‘fromkeys‘)

# 获取键值,如果键不存在,就返回默认字符
print(dic.get(‘a2‘, ‘error‘), ‘get‘)

# 获取所有键
print(dic.keys(), ‘keys‘)

# 获取所有键值
print(dic.values(), ‘values‘)

# 获取键值对
print(dic.items(), ‘items‘)

# 删除指定键值对,并返回被删除的键值
print(dic.pop(‘a1‘), ‘pop‘)

# 随机删除一个键值对,并返回被删除的键值对
print(dic.popitem(), ‘popitem‘)

# 更新字典,将其他字典,合并到当前字典,某些序列update,本身不会更新,会将更新后的内容返回
print(dic.update({‘123‘: 134, ‘456‘: 4567}), ‘update‘)


# 将[11, 22, 33, 44, 55, 66, 77, 88, 99, 100]列表里面小于60的放到字典keya, 大于等于60的放到keyb
templist = [11, 22, 33, 44, 55, 66, 77, 88, 99, 100]
tl1 = []
tl2 = []

for i in templist:
    if i >= 60:
        tl2.append(i)
    else:
        tl1.append(i)
dic = {‘a‘: tl1, ‘b‘: tl2}


print(dic)
exit()