用Python统计1000以内能被7整除数但不能被9整除的自然数的个数
i=0
for i in range(1000):
if i%7==0 and i%9!=0:
print(i)
sum = 0
for i in range (1000):
if i % 7 == 0 and i % 9 != 0:
sum = sum + 1
print(sum)
print(len([x for x in range(1000) if x%7==0 and x%9!=0]))