1 a = [1,2,3,4,5,6,4,7] 2 x = 0 3 for i in a: 4 a[x] = i**2 5 x += 1 6 print(a) 7 8 l = [1,5,7,9,16] 9 def add_l(x): 10 return x+1 11 new_l = [] 12 def hs(x): 13 for i in l: 14 new_l.append(i**2) 15 return new_l 16 print(hs(l)) 17 18 l = [1,5,7,9,16] 19 def cf_l(x): 20 return x**2 21 def newlb(func,x): 22 nl = [] 23 for i in x: 24 nl1 = func(i) 25 nl.append(nl1) 26 return nl 27 print(newlb(cf_l,l)) 28 29 l = [1,5,7,9,16] 30 31 def newlb(func,x): 32 nl = [] 33 for i in x: 34 nl1 = func(i) 35 nl.append(nl1) 36 return nl 37 print(newlb(lambda x:x**2,l)) 38 39 print(list(map(lambda x:x**2,l))) #map函数了解一下：处理序列中的每个元素，得到的结果是一个‘列表’，该‘列表’元素个数与位置与原来一样 40 41 movie = ['stt','abcd','aave','awp'] 42 43 def filter_a(x): #找出不以a开头的元素 44 aaa = [] 45 for i in x: 46 if not i.startswith('a'): 47 aaa.append(i) 48 return aaa 49 print(list(filter_a(movie))) 50 51 movie = ['stt','abcd','aave','awp'] 52 53 def face_a(x): 54 return x.startswith('a') 55 56 def filter_a(func,array): #找出不以a开头的元素 57 aaa = [] 58 for i in array: 59 if not func(i): 60 aaa.append(i) 61 return aaa 62 # print(list(filter_a(face_a,movie))) 63 print(filter_a(lambda x:x.startswith('a'),movie)) 64 65 print(list(filter(lambda x:not x.startswith('a'),movie))) #filter函数了解一下：遍历序列中的每个元素，判断每个元素的布尔值，True则留下 66 67 cc = [1,5,9,7] 68 69 # lambda x,y:x*y 70 def cf(func,x,init=None): 71 if init is None: # ‘==’也行 72 res = x.pop(0) 73 else: 74 res = init 75 for i in x: 76 res = func(i,res) 77 return res 78 79 print(cf(lambda x,y:x*y,cc)) 80 81 from functools import reduce 82 cc = [1,5,9,7] 83 84 print(reduce(lambda x,y:x*y,cc)) #reduce函数了解一下，处理一个序列，然后把序列进行合并操作