'' 集合：可变的数据类型，他里面的元素必须是不可变的数据类型，无序，不重复。 {} ''' # set1 = set({1,2,3}) # set2 = {1,2,3,[2,3],{'name':'alex'}} # 错的 集合和字典是可变数据类型 # print(set1) # print(set2) # set1 = {'alex','wusir','ritian','egon','barry',} #增 #add # set1.add('女神') # print(set1) #update #迭代增加 # set1.update('abc') # print(set1) #删除 # set1.pop() # 随机删除 # print(set1.pop()) # 有返回值 # print(set1) # set1.remove('alex') # 按元素 # print(set1) #空字典{} 空集合set() # set1.clear() # print(set1) # set() # del set1 #删除集合 # print(set1) #查 # for i in set1: # print(i)
# set1 = {1,2,3,4,5} # set2 = {4,5,6,7,8} # set3 = set1 & set2 #交集 # print(set3) # {4, 5} # print(set1.intersection(set2)) # {4, 5} # set1 = {1,2,3,4,5} # set2 = {4,5,6,7,8} # print(set1 | set2) # {1, 2, 3, 4, 5, 6, 7,8} #并集 # print(set2.union(set1)) # {1, 2, 3, 4, 5, 6, 7} # set1 = {1,2,3,4,5} # set2 = {4,5,6,7,8} # print(set1 ^ set2) # {1, 2, 3, 6, 7, 8} # print(set1.symmetric_difference(set2)) # {1, 2, 3, 6, 7, 8} # set1 = {1,2,3,4,5} # set2 = {4,5,6,7,8} # print(set1 - set2) # {1, 2, 3} #差集 # #set1独有的 # print(set1.difference(set2)) # {1, 2, 3} # set1 = {1,2,3,} # set2 = {1,2,3,4,5,6} # # print(set1 < set2) # print(set1.issubset(set2)) # 这两个相同，都是说明set1是set2子集。 # print(set2 > set1) # print(set2.issuperset(set1)) # 这两个相同，都是说明set2是set1超集。 #去重 # li = [1,2,33,33,2,1,4,5,6,6] # set1 = set(li) # # print(set1) # li = list(set1) # print(li) # s1 = {1,2,3} # print(s1,type(s1)) # s = frozenset('barry') # print(s,type(s)) # for i in s: # print(i)
深浅copy
# 赋值运算 # l1 = [1,2,3] # l2 = l1 # l1.append('a') # print(l1,l2) #copy # l1 = [1,2,3] # l2 = l1.copy() # print(l1,l2) # print(id(l1),id(l2)) # l2.append('a') # print(l1,l2) # l1 = [1,2,[4,5,6],3] # l2 = l1.copy() # # print(l1,id(l1)) # print(l2,id(l2)) # l1.append('a') # print(l1,l2) # l1[2].append('a') # print(l1,l2) # print(id(l1[2])) # print(id(l2[2])) import copy # l1 = [1,2,[4,5,6],3] # l2 = copy.deepcopy(l1) # print(l1,id(l1)) # print(l2,id(l2)) # l1[2].append('a') # print(l1,l2) # l1 = [1,[1],2,3,4] # l2 = l1 # # l1[1].append('a') # # l2 的结果是什么? # # # print(l1,id(l1)) # print(l2,id(l2)) # print(l1[1] is l2[1])
enumerate 用法
# li = ['alex','taibai','wusir','egon'] # for i in li: # print(li.index(i),i) # for index,i in enumerate(li,1): # print(index,i)