立即學習:https://edu.csdn.net/course/play/24797/282231?utm_source=blogtoedu
R = 11
ban = 0
for i in range(2*R+1):
ban = (R**2 - (R-i)**2)**0.5
start = round(R - ban)
midnum = round(2*ban)
#開始打印start個空格，然後打印*，中間打印midnum個空格，然後打印*
print(' ' * start + '*' +' ' * midnum + '*')