day3-python学习笔记

Posted 2020-10-19 Flynn丶傅

一.字典操作
# 字符串，整型，list，字典
# stus = [
#      [‘小傅‘,‘25‘,‘nan‘,‘xxx‘,‘20k‘]
#      [‘小傅‘,‘25‘,‘nan‘,‘xxx‘,‘20k‘]
#      [‘小傅‘,‘25‘,‘nan‘,‘xxx‘,‘20k‘]
#      [‘小傅‘,‘25‘,‘nan‘,‘xxx‘,‘20k‘]

#字典 k=v,取值方便，速度快
d = {‘name‘:‘小傅‘,
     ‘age‘:18,
     ‘sex‘:‘男‘,
     ‘addr‘:‘番禺区‘,
     ‘money‘:100000
    }
#字典 查
#print(d[‘name‘])
#print(d[‘money‘])
#print(d[‘haha‘])如果写了不存在的key，会报错
# print(d.get(‘sdasd‘))#查询无此key，返回none，不存在的key，不会报错
# print(d.get(‘sdasd‘,‘找不到‘))#

#字典 增加
# d[‘height‘]=178
#d.setdefault(‘weight‘,130) 只能增加不能修改
# #字典是无序的，
# print(d)

#字典 修改
# d[‘height‘]=200#如果这个key存在的话，修改他的值，如果key不存在的话，新增一个

#字典 删除
# d.pop(‘sex‘)#删除某个key
#d.popitem()#随机删除一个
#del d[‘age‘]
#d.clear()#清空字典
# print(d.keys())
# print(d.values())
# d.hash_key(‘addr‘)#python2里面字典有这个方法，有没有这个key
# if ‘addr‘ in d:
#      print(‘addr‘)

#for k,v in d.items():#循环字典，把字典key，value转成二维数组，性能差
#print(d.items())

# for k in d:#性能好
#      print(k,d[k])
#      print(k,d.get(k))

res = list(d.items())
print(res[1])
# # int()#转换成int类型
# # str()#转换成字符串类型
# # list()#转换成list类型
# res = list(d.items())
# print(res[2])

#数组，字典嵌套查询等

# stus=[

#     {‘name‘:‘彬‘,

#      ‘age‘:18,
#      ‘sex‘:‘男‘,
#      ‘addr‘:‘昌平区‘,
#      ‘money‘:100000,
#      ‘jinku‘:{
#             ‘$‘: 50000,
#             ‘￥‘:8000
#
#              }
#     },
#     {‘name‘:‘彬1‘,
#      ‘age‘:18,
#      ‘sex‘:‘男‘,
#      ‘addr‘:‘昌平区‘,
#      ‘money‘:100000,
#      ‘bag‘:{
#             ‘nike‘:‘一车‘
#
#            }
#     }
# ]
# print(stus[0][‘jinku‘][‘￥‘])
# #print(stus[‘tlx‘][‘money‘])
# print(stus[1][‘bag‘][‘nike‘])

stus = {
    ‘ybq‘: {
        ‘age‘: 18,
        ‘sex‘: ‘男‘,
        ‘addr‘: ‘昌平区‘,
        ‘money‘: 10000000,
        ‘jinku‘: {
            ‘建行卡‘: 80000,
            ‘工商卡‘: 800000,
            ‘招商卡‘: 8000000
        }
    },
    ‘tlx‘: {
        ‘age‘: 19,
        ‘sex‘: ‘女‘,
        ‘addr‘: ‘昌平区‘,
        ‘money‘: 10000000,
        ‘huazhuangpin‘:
            [‘cha‘, ‘haha‘]

    },
    ‘mpp‘: {
        ‘age‘: 19,
        ‘sex‘: ‘女‘,
        ‘addr‘: ‘昌平区‘,
        ‘money‘: 10000000,
        "bag": {
            ‘lv‘: ‘一车‘,
            ‘鳄鱼‘: 10
        }
    },
}
# print(stus[‘tlx‘][‘money‘])
# print(stus[‘mpp‘][‘bag‘].keys())
#
# all_money = stus[‘ybq‘][‘jinku‘].values()
# # print(all_money)
# # print(sum(all_money))
# sum_money = 0
# for money in all_money:
#     sum_money = sum_money + money
# print(sum_money)

#print(stus[‘tlx‘][‘huazhuangpin‘][1])



# all_money = stus[‘ybq‘][‘jinku‘].values()
# #print(sum(all_money))
# sum_money = 0
# for money in all_money:
#     sum_money=sum_money +money
#
# print(sum_money)
print(stus[‘tlx‘][‘huazhuangpin‘][1])