python---Define and invoke function.

def sum(a,b):
    return a+b

func = sum
r = func(5,6)
print r

# Defines function with default argument
def add(a,b=2):
    return a+b
r=add(1)
print r
r=add(1,5)
print r

 

 

运行结果：

11

3

6