# -*- coding: utf-8 -*-
"""
.format is not somenthing hou have to use with every 
print statement,but it is very powerful and can save
you a lot of keystrokes.
"""

#整数
x = 9
print("Output #4: {0}".format(x))
#浮点数
y = 9.3
print("Output #5: {0:2.3f}".format(y*1.2222))

#常用的数学计算

      
 