從概念上理解，print是打印輸出，return是返回值。區(qū)別如下：
1、return是結(jié)束語(yǔ)一般放在函數(shù)的最后，當(dāng)函數(shù)執(zhí)行return 得到返回值后，后面的語(yǔ)句就不執(zhí)行了。

------------------------------
def additive(x,y):
    z = x + y
    print("hello world!")
    return z
    print("I love Python!")
additive(1,1)
-------------------------------
hello world!
2

2、return返回的結(jié)果可以被調(diào)用。

------------------------------
def additive(x,y):
    z = x + y
    print("I love Python!")
    return z
    print("I can't print!")
------------------------------
print (additive(1,1))
x= (additive(1,1))+10
print (x)
------------------------------
I love Python!
2
I love Python!
12

3、print僅僅只是打印，沒有結(jié)果

------------------------------
def additive(x,y):
    z = x + y
    print(z)
------------------------------
print (additive(1,1))
x= (additive(1,1))+10
print (x)
------------------------------
2
None
2

TypeError                                 Traceback (most recent call last)
<ipython-input-16-1f9bcb00fbf9> in <module>()
      1 print (additive(1,1))
----> 2 x= (additive(1,1))+10
      3 print (x)

TypeError: unsupported operand type(s) for +: 'NoneType' and 'int'