import math
def CircleArea(r):
area=math.pi *r *r
return area
def mypow(x,y=2):
return x **y, x+y
print( " hello" )
a,b=mypow(3,4)
print(a,b)
def editNumber( number):
number=1
print( " number 的值为:",number)
num=2
editNumber( num)
print ( num )
def f(k):
if k<=3:
print(k)
return
for i in range(1,4):
f(k-i)
return
执行语句f(6),则f(3)被调用的次数为( )