if __name__ == '__main__':
n = 1
while n <= 7:
a = int(raw_input('input a number:\n'))
while a < 1 or a > 50:
a = int(raw_input('input a number:\n'))
print a * '*'
n += 1
以上实例输出结果为:
input a number:
9
*********
input a number:
5
*****
input a number:
6
******
input a number: