# len() 计算容器重元素个数 str1 = 'abcdefg' list1 = [10, 20, 30, 40, 50] t1 = (100, 200, 300, 400, 500) s1 = {100, 200, 300, 400, 500} dict1 = {'name': 'python', 'age': '18'} print(len(str1)) # 7 print(len(s1)) # 5 print(len(list1)) # 5 print(len(t1)) # 5 print(len(dict1)) # 2 print(len(dict1.keys())) # 2 # del 删除 del或del() str1 = 'abcdefg' list1 = [10, 20, 30, 40, 50] t1 = (100, 200, 300, 400, 500) s1 = {100, 200, 300, 400, 500} dict1 = {'name': 'python', 'age': '18'} # del str1 # print(str1) # name 'str1' is not defined # del(list1) # print(list1) # name 'list1' is not defined # del(list1[0]) # print(list1) # [20, 30, 40, 50] # del dict1 # print(dict1) # name 'dict1' is not defined # del dict1["name"] # # print(dict1) # {'age': '18'}
# max() 返回容器重最大值 min() 返回容器中最小值 str1 = 'abcdef' list1 = [10, 20, 30, 40, 50] print(max(str1)) # f print(min(str1)) # a print(max(list1)) # 50 print(min(list1)) # 10
# range() 生成从start到end的数字,步长为step,供for循环使用 # str1 = 'abcdefgijklmnopqwxyz' for i in range(1, 10, 1): print(i) # 1,3,5,7,9 for i in range(1, 10, 2): print(i) # 0,1,2,3,4,5,6,7,8,9 for i in range(10): print(i) # 如果不写开始默认从0开始 # 如果不写步长默认为1
# enumerate() 函数用于将一个可遍历的数据对象(列表,元组或字符串) # 组合为一个索引序列同时列出数据和下表,一般用在for循环当中 # 语法 enumerate(可遍历对象, start=0) list1 = ['a', 'b', 'c', 'd', 'e'] for i in enumerate(list1): print(i) # 下标 值 # (0, 'a') # (1, 'b') # (2, 'c') # (3, 'd') # (4, 'e') for i in enumerate(list1, start=1): print(i) # (1, 'a') # (2, 'b') # (3, 'c') # (4, 'd') # (5, 'e')
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