文章标题 原创 翻译 转载 文章内容 列表遍历使用高阶函数代码看起来更加简洁明了,普通for in遍历更加灵活。 字典可以很容易的通过函数获取keys和values列表,for in也有几种不同的方式。 ``` from functools import reduce def foo0(): print('高阶函数遍历') # 将列表中的元素翻倍 ls = [1, 2, 3, 4, 5, 6] ls2 = list(map(lambda x: x * 2, ls)) print(ls2) # 过滤保留偶数 ls3 = list(filter(lambda x : x % 2 == 0, ls)) print(ls3) # 列表元素和 sum = reduce(lambda x,y: x+y, ls) print(sum) def foo1(): print('普通for in遍历') ls = [1, 2, 3, 4, 5, 6] ls2 = [] for v in ls: ls2.append(v * 2) print(ls2) ls3 = [] for v in ls: if v % 2 == 0: ls3.append(v) print(ls3) sum = 0 for v in ls: sum += v print(sum) def foo2(): print('带下标的for循环') ls = [1, 2, 3, 4, 5, 6] for i, v in enumerate(ls): ls[i] = v * 2 print(ls) for i in range(len(ls)): ls[i] *= 2 print(ls) def foo3(): print('字典的几种遍历方式') d = {'color': 'red', 'fruit': 'apple', 'pet': 'dog'} print('输出keys列表', d.keys()) print('输出所有values列表', d.values()) print('输出所有key:') for key in d: print(key) print('输出key和value:') for key in d: print(key, '->', d[key]) print('输出列表,元素是tuple:') for item in d.items(): print(item[0], ',', item[1]) print('输出key和value:') for k, v in d.items(): print(k, v) if __name__ == "__main__": foo0() foo1() foo2() foo3() ``` 文章类别 Python Mobile Android Java Shell Life Database Bug Windows IOS Tools Boost Node.js Mac Product Tips C/C++ Golang Javascript React Qt MQ MongoDB Design Web Linux LLM ChatGPT RAG AI 提交