# 字典 # dict # dic = { # "k1": ‘v1‘, # "k2": ‘v2‘ # } # 1 根据序列，创建字典，并指定统一的值 # v = dict.fromkeys(["k1",123,"999"],123) # print(v) # 2 根据Key获取值，key不存在时，可以指定默认值（
# 字典 # dict # dic = { # "k1": ‘v1‘, # "k2": ‘v2‘ # } # 1 根据序列，创建字典，并指定统一的值 # v = dict.fromkeys(["k1",123,"999"],123) # print(v) # 2 根据Key获取值，key不存在时，可以指定默认值（None） # v = dic[‘k11111‘] # print(v) # v = dic.get(‘k1‘,111111) # print(v) # 3 删除并获取值 # dic = { # "k1": ‘v1‘, # "k2": ‘v2‘ # } # v = dic.pop(‘k1‘,90) # print(dic,v) # k,v = dic.popitem() # print(dic,k,v) # 4 设置值， # 已存在，不设置，获取当前key对应的值 # 不存在，设置，获取当前key对应的值 # dic = { # "k1": ‘v1‘, # "k2": ‘v2‘ # } # v = dic.setdefault(‘k1111‘,‘123‘) # print(dic,v) # 5 更新 # dic = { # "k1": ‘v1‘, # "k2": ‘v2‘ # } # dic.update({‘k1‘: ‘111111‘,‘k3‘: 123}) # print(dic) # dic.update(k1=123,k3=345,k5="asdf") # print(dic) # 6 keys() 7 values() 8 items() get update ################################################## # 1.基本机构 # info = { # "k1": "v1", # 键值对 # "k2": "v2" # } # 2.字典的value可以是任何值 # info = { # "k1": 18, # "k2": True, # "k3": [ # 11, # [], # (), # 22, # 33, # { # ‘kk1‘: ‘vv1‘, # ‘kk2‘: ‘vv2‘, # ‘kk3‘: (11,22), # } # ], # "k4": (11,22,33,44) # } # print(info) # 3.布尔值(1,0)、列表、字典不能作为字典的key # info ={ # 1: ‘asdf‘, # "k1": ‘asdf‘, # True: "123", # # [11,22]: 123 # (11,22): 123, # # {‘k1‘:‘v1‘}: 123 # # } # print(info) # 4.字典无序 # info = { # "k1": 18, # "k2": True, # "k3": [ # 11, # [], # (), # 22, # 33, # { # ‘kk1‘: ‘vv1‘, # ‘kk2‘: ‘vv2‘, # ‘kk3‘: (11,22), # } # ], # "k4": (11,22,33,44) # } # print(info) # 5.索引方式找到指定元素 # info = { # "k1": 18, # 2: True, # "k3": [ # 11, # [], # (), # 22, # 33, # { # ‘kk1‘: ‘vv1‘, # ‘kk2‘: ‘vv2‘, # ‘kk3‘: (11,22), # } # ], # "k4": (11,22,33,44) # } # # v = info[‘k1‘] # # print(v) # # v = info[2] # # print(v) # v = info[‘k3‘][5][‘kk3‘][0] # print(v) # 6.字典支持 del 删除 # info = { # "k1": 18, # 2: True, # "k3": [ # 11, # [], # (), # 22, # 33, # { # ‘kk1‘: ‘vv1‘, # ‘kk2‘: ‘vv2‘, # ‘kk3‘: (11,22), # } # ], # "k4": (11,22,33,44) # } # del info[‘k1‘] # # del info[‘k3‘][5][‘kk1‘] # print(info) # 7.for循环 # info = { # "k1": 18, # 2: True, # "k3": [ # 11, # [], # (), # 22, # 33, # { # ‘kk1‘: ‘vv1‘, # ‘kk2‘: ‘vv2‘, # ‘kk3‘: (11,22), # } # ], # "k4": (11,22,33,44) # } # for item in info: # print(item) # # for item in info.keys(): # print(item) # for item in info.values(): # print(item) # for item in info.keys(): # print(item,info[item]) # for k,v in info.items(): # print(k,v) # True 1 False 0 # info ={ # "k1": ‘asdf‘, # True: "123", # # [11,22]: 123 # (11,22): 123, # # {‘k1‘:‘ v1‘}: 123 # # } # print(info)