判断质数

#判断是否为质数

# def pri(n,m):
#     ret = []
#     for i in range(n,m+1):
#         for j in range(2,i):
#             if i % j == 0:
#                 b = i
#             ret.append(b)
#     return ret
# a = set(range(100,201))
# print(a-set(pri(100,200)))



# def pri(n,m):
#     ret = []
#     for i in range(n,m+1):
#         for j in range(2,i):
#             if i % j == 0:
#                 break
#         else:
#             ret.append(i)
#     return ret
# print(pri(100,200))