题解 | #空心正方形图案#
空心正方形图案
http://www.nowcoder.com/practice/72347ee949dc47399186ee183632f303
双层循环
#双层循环
def print_pic(n):
for i in range(1,n+1):
for j in range(1,n+1):
if i==1 or i==n or j==1 or j==n:
print("* ",end="")
else:
print(" ",end="")
print()
while True:
try:
num=input()
print_pic(int(num))
except:
break