def sequential_search(lis, key):
for i in range(len(lis)):
if(lis[i] == key):
return i
else:
return False
LIST = [1, 5, 8, 123, 22, 54, 7, 99, 300, 222]
result = sequential_search(LIST, 5)
print(result)
原文：https://www.cnblogs.com/sea-stream/p/9689104.html