def circle():
　　r=input('please enter the radius of the circle:')
　　area=3.14*r**2
　　return area

def rectangle():
　　l=input('please enter the length of the rectangle:')
　　w=input('please enter the wide of the rectangle:')
　　area=l*w
　　return area

def triangle():
　　l=input('please enter the length of triangle\'s bottm:')
　　h=input('please enter the height of the triangle:')
　　area=0.5*h*l
　　return area

flag=True
while flag:
　　print ('\n please to select C ,R,T, Q:')
　　print ('c: circle')
　　print ('R: rectangle')
　　print ('T: triangle')
　　print ('Q: quit')
　　s=raw_input('Please enter the C,T,R,Q')
　　if s=='c'or s=='C':
　　　　area=circle()
　　elif s=='r' or s=='Re':
　　　　area=rectangle()
　　elif s=='t' or s=='T':
　　　　area=triangle()
　　elif s=='q' or s=='Q':
　　flag=False
　　print ['the area is ', circle()，rectangle(),triangle()]

###程序运行截图