为什么函数在Python输出中返回None

Question

我想知道为什么以下两个代码在Python输出中都没有返回值？有人能帮我分别正确地编写这两个代码，告诉我是什么导致它返回None并解释一下吗？我需要以下输出：支付498.75

# 1st Code - Returning None 
def computepay(int1,int2):
    try: 
        h = float(int1)
        r = float(int2)
    except:
        print ("Error, please enter a numeric input")
        quit()
    if h >= 40:
        pay1 = 40 * r + (h - 40) * r * 1.5

        #print(pay1)
    else:
        pay2 = h * r
        #print( pay2)
p = computepay(45,10)
print("Pay",p)

# 2nd Code - Returning None 
def computepay(int1,int2):
    try: 
        h = float(int1)
        r = float(int2)
    except:
        print ("Error, please enter a numeric input")
        quit()
    if h >= 40:
        pay1 = 40 * r + (h - 40) * r * 1.5

        print(pay1)
    else:
        pay2 = h * r
        print( pay2)
print("Pay",computepay(45,10.5))
#print("Pay",p)

Answer 1

您需要包含一个return语句，以便python知道返回什么：

def computepay(int1,int2):
    try: 
        h = float(int1)
        r = float(int2)
    except:
        print("Error, please enter a numeric input")
        quit()
    if h >= 40:
        return 40 * r + (h - 40) * r * 1.5
    else:
        return h * r
p = computepay(45,10.5)
print("Pay",p)