#!/usr/bin/env/python # -*- coding:utf-8 -*- # 一、列表：list #1、 原值最后追加:append() # li = [11, 22, 33, 44, 55, 66] # li.append(77) # li.append('alex') # li.append([77, 88]) # append()只能添加一项数据 # print(li) # 2、清空列表:clear() # li = [11, 22, 33, 44, 55, 66] # li.clear() # print(li) # 3、拷贝（浅拷贝）:copy() # li = [11, 22, 33, 44, 55, 66] # v = li.copy() # print(v) # 4、计算元素出现的次数:count() # li = [11, 22, 33, 44, 55, 66, 11, 11] # v = li.count(11) # print(v) # 5、扩展原列表，要求参数为可迭代对象:extend() # li = [11, 22, 33, 44, 55, 66] # # li.append([77,88,'不得了']) # # print(li) # # li.extend([77,88,'不得了']) # # print(li) # # for i in [77,88,'不得了']: # # li.append(i) # # print(li) # li.extend('不得了') # print(li) # 6、根据值获取当前值索引位置（左边优先） # li = [11, 22, 33, 44, 55, 66] # v = li.index(33) # print(v) # 7、在指定索引位置插入元素 # li = [11, 22, 33, 44, 55, 66] # li.insert(3,99) # print(li) # # 8、删除某个值（1.指定索引；2.默认为最后一个值），并获取删除的值 # li = [11, 22, 33, 44, 55, 66] # # v = li.pop() # # print(v) # # print(li) # # v = li.pop(2) # print(v) # print(li) # # 9、删除列表中的指定值，左边优先 # li = [11, 22, 55, 33, 44, 55, 66] # li.remove(55) # print(li) # # PS:删除功能的算法：pop,remove,del li[0],del li[7:9],clear # 10、将当前列表进行翻转 # li = [11, 22, 33, 44, 55, 66] # li.reverse() # print(li) # 11、列表的排序 # li = [22, 44, 11, 33, 66, 55] # # li.sort() # li.sort(reverse = True) # print(li) # 12、索引取值 # li = [22, 44, 11, 33, 66, 55] # print(li[3]) # 13、切片，切片结果也是列表 # li = [22, 44, 11, 33, 66, 55] # # print(li[1:4]) # print(li[1:-1]) # 14、for循环，while循环 # li = [22, 44, 11, 33, 66, 55] # for item in li: # print(item) # 15、列表元素可以被修改 # li = [22, 44, 11, 33, 66, 55] # # li[1] = 99 # li[1] = [11, 22, 33, 44] # print(li) # 16、列表元素删除操作 # li = [22, 44, 11, 33, 66, 55] # # del li[1] # # li[1:3] = [11,44,55] # del li[1:3] # print(li) # 17、in 操作 # li = [1, 12, 9, "age", [ "是真问",["19", 81], "庞麦郎"], "alex", True] # # v = "是真问" in li # # v = "是真问" in li[4] # # v = 'age' in li # print('age' in li) # 18、索引操作 # li = [1, 12, 9, "age", [ "是真问",["19", 81], "庞麦郎"], "alex", True] # # print(li[4][1][0]) # print(li[4]) # 19、list操作，字符串转换列表，内部使用for循环 # # s = "lkasdjhlaifhuoijlkoqkj" # # v = list(s) # i = 123 # v = str(i) # print(v) # 20、列表转换成字符串 # 自己使用for循环一个一个处理，要求只包含数字和字符串: # li = [11, 22, 33, "123", "alex"] # # r = str(li) # # print(r) # s = "" # for i in li: # s += str(i) # # print(s) # # 直接使用字符串join方法：要求列表中的元素只有字符串 # li = ["123", "alex"] # v = "".join(li) # print(v) # 21、字符串创建后不可修改 # v = "alex" # # new_v = v.replace('l','eee') # # print(v,new_v) # print(v) # 22、列表有序，元素可以被修改 # li = [11, 22, 33, 44] # # li[0] = 55 # li[1] = "alex" # print(li) # 二、元组：tuple #1、元组，元素不可被修改、增加或删除 # # 2、获取指定元素在元组中出现的次数 # tu = (11,22,33,44,22,22) # # v = tu.count(22) # print(v) # # 3、获取指定元素在元组中的索引号，左边优先 # tu = (11,22,33,44,22,22) # v = tu.index(22) # print(v) # 4、书写格式：（一般在写元组的时候推荐在最后加入“，”） # 元素不可被修改、增加或删除 # tu = (111, "alex", (11, 22),[(33, 44), 55], True, 33, 44,) # 5、支持索引 # tu = (111, "alex", (11, 22),[(33, 44), 55], True, 33, 44,) # v = tu[4] # print(v) # 6、切片 # tu = (111, "alex", (11, 22),[(33, 44), 55], True, 33, 44,) # v = tu[0:3] # print(v) # 7、可以被for循环，是可迭代对象 # tu = (111, "alex", (11, 22),[(33, 44), 55], True, 33, 44,) # for item in tu: # print(item) # 8、转换 s = "djhksadhjais8" li = ["asdsa", "fsdd", 8] tu = ("asdsds", "asdfsfs") # v = tuple(s) # # print(v) # v = tuple(li) # print(v) # v = list(tu) # print(v) # v = "".join(tu) # print(v) # 9、扩展 # tu = ("asdsds", "asdfsfs") # li.extend((11, 22, 33,)) # print(li) # 10、元组的一级元素不可修改/删除/增加 # tu = (111, "alex", (11, 22),[(33, 44), 55], True, 33, 44,) # tu[3][0] = 22 # print(tu) # 三、字典 # 1、样式 # dic = { # "k1":'v1',#键值对 # "k2":'v2' # } # 2、根据序列创建字典，并指定统一的值 # v = dict.fromkeys(["k1", 123, "999", (232, "asdd")], 123) # print(v) # 3、根据key值获取值，当key不存在时报错 # dic = { # "k1":'v1', # "k2":'v2' # } # v = dic["k1"] # # 4、根据key值取值，当key不存在时，可指定返回默认值（None） # dic = { # "k1":'v1', # "k2":'v2' # } # v = dic.get('k111'111) # print(v) # 5、删除指定键值对并获取值 # dic = { # "k1":'v1', # "k2":'v2' # } # v = dic.pop('k1',90) # print(dic,v) # 6、随机删除一个键值对并获取删除的元素 # dic = { # "k1":'v1', # "k2":'v2' # } # k,v = dic.popitem() # print(dic,k,v) # 7、设置值， # 已存在：不设置，获取原有key以对应的值 # 不存在：设置，获取当前key对应的值 # dic = { # "k1":'v1', # "k2":'v2' # } # v = dic.setdefault('k111','123') # print(dic,v) # 8、更新 # dic = { # "k1":'v1', # "k2":'v2' # } # # dic.update({'k1':'13232','k3':1233}) # dic.update(k1 = 321,k3 = '321',k5 = 'ads') # print(dic) # 9、字典的value可以是任何值 # info = { # "k1":123, # "k2":True, # "k3":[ # 11, # [12,"123"], # (21,"sd"), # 22, # 33, # { # 'kk1':'vv1', # 'kk2':'vv2', # 'kk3':'vv3', # } # ], # "k4":(11,22,33,44,'55') # } # print(info) # 10、列表、字典不能作为字典的key # info = { # 2:'asds', # "k1":'asdsad', # True:"1232", # # [11,22]:123, # (11,22):123, # # {'k1':'v1'}:132 # } # print(info) # 11、字典无序 # info = { # "k1":123, # "k2":True, # "k3":[ # 11, # [12,"123"], # (21,"sd"), # 22, # 33, # { # 'kk1':'vv1', # 'kk2':'vv2', # 'kk3':'vv3', # } # ], # "k4":(11,22,33,44,'55') # } # print(info) # 12、支持索引方式找到指定值 # info = { # "k1":123, # 2:True, # "k3":[ # 11, # [12,"123"], # (21,"sd"), # 22, # 33, # { # 'kk1':'vv1', # 'kk2':'vv2', # 'kk3':'vv3', # } # ], # "k4":(11,22,33,44,'55') # } # # v = info['k1'] # # v = info[2] # v = info['k3'][5]['kk1'] # print(v) # 13、字典支持del删除 # info = { # "k1":123, # "k2":True, # "k3":[ # 11, # [12,"123"], # (21,"sd"), # 22, # 33, # { # 'kk1':'vv1', # 'kk2':'vv2', # 'kk3':'vv3', # } # ], # "k4":(11,22,33,44,'55') # } # # del info['k3'] # del info['k3'][5]['kk2'] # print(info) # 14、for循环 # info = { # "k1":123, # "k2":True, # "k3":[ # 11, # [12,"123"], # (21,"sd"), # 22, # 33, # { # 'kk1':'vv1', # 'kk2':'vv2', # 'kk3':'vv3', # } # ], # "k4":(11,22,33,44,'55') # } # 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) # 重点掌握以下内容 # 一、数字 # int(..) # 二、字符串 # replace/find/join/strip/startwith/split/upper/lower/format # template = "i am {name},age:{age}" # # v = template.format(name = 'alxe',age = 19) # v = template.format(**{'name':'alxe','age':19}) # print(v) # 三、列表 # append/extend/insert # 索引、切片、循环 # 四、元组 # 索引、切片、循环、一级元素不能被修改 # 五、字典 # get/update/keys/values/items # for,索引 # dic = { # "k1":"v1", # } # # v = "k2" in dic # v = "v1" in dic.values() # print(v) # 六、布尔值 # 0 1 # bool(...) # None "" () [] {} 0 ==>False
