解包也叫解构
a, b, c = ("马化腾", "马云", "马良") print(b)
结果：
马云
a, b = [1, 2] print(a) print(b)
结果：
1 2
info = {‘stu1101‘: ‘marry‘, ‘stu1102‘: ‘jack‘, ‘stu1103‘: ‘zou‘}
print(info) # {‘stu1101‘: ‘marry‘, ‘stu1102‘: ‘jack‘, ‘stu1103‘: ‘zou‘}
print(info[‘stu1102‘]) # 查 jack
print(info.get(‘stu1104‘)) # 字典中没有的显示None，第二个参数是设置返回的值 None
info[‘stu1101‘] = ‘zouzou‘ # 改 如果key重复了. 会替换掉原来的value
print(info)
info[‘stu1104‘] = ‘Lihua‘ # 增
print(info)
info.pop(‘stu1102‘) # 删
print(info)
del info # 删除字典
结果：
{‘stu1101‘: ‘marry‘, ‘stu1102‘: ‘jack‘, ‘stu1103‘: ‘zou‘}
jack
None
{‘stu1101‘: ‘zouzou‘, ‘stu1102‘: ‘jack‘, ‘stu1103‘: ‘zou‘}
{‘stu1101‘: ‘zouzou‘, ‘stu1102‘: ‘jack‘, ‘stu1103‘: ‘zou‘, ‘stu1104‘: ‘Lihua‘}
{‘stu1101‘: ‘zouzou‘, ‘stu1103‘: ‘zou‘, ‘stu1104‘: ‘Lihua‘}
dic = {"牌牌": "你去哪里了", "晓雪": "你快回来.", "雪雪": "又走了"}
ret = dic.pop("晓雪") # 删除一个元素.返回这个元素的value值
print(ret)
结果：
你快回来.
info = {‘stu1101‘: ‘marry‘, ‘stu1102‘: ‘jack‘, ‘stu1103‘: ‘zou‘}
print(info)
b = {‘stu1102‘: ‘time‘, 1: 3, ‘1108‘: ‘data‘}
info.update(b) # 两个字典合并，有的会覆盖，没有的添加到里面
print(info)
print(info.items()) # 将字典转换为列表
结果：
{‘stu1101‘: ‘marry‘, ‘stu1102‘: ‘jack‘, ‘stu1103‘: ‘zou‘}
{‘stu1101‘: ‘marry‘, ‘stu1102‘: ‘time‘, ‘stu1103‘: ‘zou‘, 1: 3, ‘1108‘: ‘data‘}
dict_items([(‘stu1101‘, ‘marry‘), (‘stu1102‘, ‘time‘), (‘stu1103‘, ‘zou‘), (1, 3), (‘1108‘, ‘data‘)])
info = {‘stu1101‘: ‘marry‘, ‘stu1102‘: ‘jack‘, ‘stu1103‘: ‘zou‘}
for i in info: # 直接循环字典.拿到的是key
# print(i) #只打印key值
print(i, info[i])
结果：
stu1101 marry
stu1102 jack
stu1103 zou
dic = {"及时雨": "宋江", "易大师": "剑圣", "维恩": "暗影猎手"}
print(dic.keys()) # 拿到所有的key, 返回key的集合. 像是列表. 但是不是列表
for key in dic.keys(): # 可以进行迭代循环
print(key)
结果：
dict_keys([‘及时雨‘, ‘易大师‘, ‘维恩‘]) 及时雨 易大师 维恩
dic = {"及时雨": "宋江", "易大师": "剑圣", "维恩": "暗影猎手"}
print(dic.values())
for value in dic.values():
print(value)
结果：
dict_values([‘宋江‘, ‘剑圣‘, ‘暗影猎手‘]) 宋江 剑圣 暗影猎手
dic = {"及时雨": "宋江", "易大师": "剑圣", "维恩": "暗影猎手"}
print(dic.items()) # 拿到键值对
# 遍历dict
for k, v in dic.items():
# k,v=item() 解包
print(k, v)
结果：
dict_items([(‘及时雨‘, ‘宋江‘), (‘易大师‘, ‘剑圣‘), (‘维恩‘, ‘暗影猎手‘)]) 及时雨 宋江 易大师 剑圣 维恩 暗影猎手
原文：https://www.cnblogs.com/zouzou-busy/p/12994905.html