立即學習:https://edu.csdn.net/course/play/24797/282231?utm_source=blogtoedu
'''
**
* *
* *
* *
* *
**
'''
R = 5
for i in range(2*R+1):
half = (R**2 - (R - i)**2)**0.5
start = round(R - half)
midnum = round(2 * half)
# 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 + '*')