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Real life scenario:
I gave my son 10 yuan and asked him to buy it for me Pack of cigarettes. In this example, I gave 10 yuan to my son, which is equivalent to passing the parameters when calling the function. The ultimate goal of letting my son buy cigarettes is to let him bring the cigarettes back to you and then give them to you, right? At this time, the smoke is the return value
Scenario in development:
defines a function and completes the acquisition of indoor temperature. Think about whether this result should be given to the caller, only the caller Only with this return value can we make appropriate adjustments according to the current temperature
In summary:
The so-called "return value" means that after the function in the program completes one thing, the final Result to the caller
If you want to return the result to the caller in the function, you need to use return
in the function as follows Example:
def add2num(a, b): c = a+b return c
or
def add2num(a, b): return a+b
In the example of "buying cigarettes" mentioned at the beginning of this section, at the end When your son gives you a cigarette, you must take it from his hand, right? The same is true for programs. If a function returns a data, and you want to use this data, you need to save the return of the function. Value examples are as follows:
#定义函数 def add2num(a, b): return a+b #调用函数,顺便保存函数的返回值 result = add2num(100,98) #因为result已经保存了add2num的返回值,所以接下来就可以使用了 print (result)
Result:
1984. Types of four functions
def printMenu(): print('--------------------------') print(' xx涮涮锅 点菜系统') print('') print(' 1. 羊肉涮涮锅') print(' 2. 牛肉涮涮锅') print(' 3. 猪肉涮涮锅') print('--------------------------')
The result :
2. Functions with no parameters and return values
# 获取温度 def getTemperature(): #这里是获取温度的一些处理过程 #为了简单起见,先模拟返回一个数据 return 24 #小编创建了一个Python学习交流群:725638078 temperature = getTemperature() print('当前的温度为:%d'%temperature)
Result:
The current temperature is: 243. There are parameters, but no return value Function
4. Functions with parameters and return values
# 计算1~num的累积和 def calculateNum(num): result = 0 i = 1 while i<=num: result = result + i i+=1 return result result = calculateNum(100) print('1~100的累积和为:%d'%result)
Result: The cumulative sum of
1~100 is: 50505. Summary
5. Can we return multiple values in python?
>>> def divid(a, b): ... shang = a//b ... yushu = a%b ... return shang, yushu ... >>> sh, yu = divid(5, 2) >>> sh 5 >>> yu 1
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