for i in range(6):
    print(i)

for n in range(2, 100):
    for x in range(2, n):
        if n % x == 0:
            print(n, '等于', x, '*', n // x)
            break
    else:
        # 循环中没有找到元素
        print(n, ' 是质数')

for letter in 'Runoob':
    if letter == 'o':
        pass
        print('执行 pass 块')
    print('当前字母 :', letter)

print("Good bye!")
