测试文件已写
1.检测数字序列两边相加是否相等，相等返回中间的数，否则返回-1
a=[1,2,3,4,5] return -1
b=[7,8,5,7,,8] return 5
1、
a=[1,2,3,4,5]
b=[7,8,5,8,7]
def find(arr):
for i,key in enumerate(arr):
r=0
l=0
for x in arr[i+1:]:#序列长度为n，取序列右边的n—(i+1)个数
r+=x
for x in arr[:i]:
l +=x
if(r==l):
return arr[i]
break
return -1 #print(i,key) print(find(b))
print(find([7,8,5,8,7]))
2，十进制转二进制
def test(request):
sum = 5615
temp = []
b_sum = ''
while sum>0:
temp.append(sum%2)
sum = int(sum/2)
while temp:
b_sum =b_sum + str(temp.pop())
return HttpResponse(b_sum)
