1 #生成式 2 prices = { 3 'meat' : 543.2, 4 'duck' : 123.56, 5 'dog' : 45.67, 6 'horse' : 78.55, 7 'miao' : 123.55 8 } 9 price = {key : value for key, value in prices.items() if value > 100} 10 print(price) 11 12 #嵌套的列表 13 names = ['小明', '小红', '小王'] 14 courses = ['英语', '数学', '生物', '物理'] 15 chart = [[None]*len(courses) for _ in range(len(names))] 16 for low, name in enumerate(names): 17 for lol, course in enumerate(courses): 18 chart[low][lol] = float(input(f'{name}的{course}成绩为：')) 19 print(chart) 20 21 #heapq模块(堆排列) 22 import heapq 23 list1 = [44, 23, 56, 34, 33, 55, 234, 45, 24, 46] 24 list2 = [ 25 {'name' : '小明', 'shares':45, 'price':234}, 26 {'name' : '小红', 'shares':55, 'price':567}, 27 {'name' : '小王', 'shares':89, 'price':678}, 28 {'name' : '小玉', 'shares':67, 'price':980}, 29 ] 30 print(heapq.nlargest(3, list1)) 31 print(heapq.nsmallest(3, list1)) 32 print(heapq.nlargest(2, list2, key = lambda x :x['shares'])) 33 print(heapq.nlargest(2, list2, key=lambda x:x['price'])) 34 35 #itertools模块(迭代工具) 36 import itertools 37 #产生abcd全排列 38 print(itertools.permutations('abcd')) 39 #产生abcde的五选三组合 40 print(itertools.combinations('abcde', 5)) 41 #产生abcd和123的笛卡尔积 42 print(itertools.product('abcd', '123')) 43 #产生abc的无限序列 44 print(itertools.cycle(('a','b','c')))