


1. Return value introduction
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
2. Function with return value
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
3. Save the return value of the function
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
Functions depend on whether they have parameters or not , whether there is a return value, can be combined with each other, there are 4 types in total
- No parameters, no return value
- No parameters, regret again
- There are parameters and no return value
- There are parameters and there are return values
- 1.None Parameters, functions without return values
This type of function cannot receive parameters and has no return value. Generally, it has a function similar to the printing prompt light. Use this type of function
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
This type of function cannot receive parameters, but can return certain data. Under normal circumstances , like collecting data, use this type of function
# 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
This type of function can receive parameters, but cannot return data. Generally, this type of function is used when setting data for certain variables without requiring results
4. Functions with parameters and return values
This type of function can not only receive parameters, but also return certain data. Generally speaking, such functions are used for applications that require data processing and require results
# 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
The function depends on whether there are parameters or not. When the return values can be combined with each other to define functions, they are designed based on actual functional requirements, so the function types written by different developers are different
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
The essence is to use tuples
The above is the detailed content of Code analysis of return values and types of functions in python. For more information, please follow other related articles on the PHP Chinese website!

Python and C each have their own advantages, and the choice should be based on project requirements. 1) Python is suitable for rapid development and data processing due to its concise syntax and dynamic typing. 2)C is suitable for high performance and system programming due to its static typing and manual memory management.

Choosing Python or C depends on project requirements: 1) If you need rapid development, data processing and prototype design, choose Python; 2) If you need high performance, low latency and close hardware control, choose C.

By investing 2 hours of Python learning every day, you can effectively improve your programming skills. 1. Learn new knowledge: read documents or watch tutorials. 2. Practice: Write code and complete exercises. 3. Review: Consolidate the content you have learned. 4. Project practice: Apply what you have learned in actual projects. Such a structured learning plan can help you systematically master Python and achieve career goals.

Methods to learn Python efficiently within two hours include: 1. Review the basic knowledge and ensure that you are familiar with Python installation and basic syntax; 2. Understand the core concepts of Python, such as variables, lists, functions, etc.; 3. Master basic and advanced usage by using examples; 4. Learn common errors and debugging techniques; 5. Apply performance optimization and best practices, such as using list comprehensions and following the PEP8 style guide.

Python is suitable for beginners and data science, and C is suitable for system programming and game development. 1. Python is simple and easy to use, suitable for data science and web development. 2.C provides high performance and control, suitable for game development and system programming. The choice should be based on project needs and personal interests.

Python is more suitable for data science and rapid development, while C is more suitable for high performance and system programming. 1. Python syntax is concise and easy to learn, suitable for data processing and scientific computing. 2.C has complex syntax but excellent performance and is often used in game development and system programming.

It is feasible to invest two hours a day to learn Python. 1. Learn new knowledge: Learn new concepts in one hour, such as lists and dictionaries. 2. Practice and exercises: Use one hour to perform programming exercises, such as writing small programs. Through reasonable planning and perseverance, you can master the core concepts of Python in a short time.

Python is easier to learn and use, while C is more powerful but complex. 1. Python syntax is concise and suitable for beginners. Dynamic typing and automatic memory management make it easy to use, but may cause runtime errors. 2.C provides low-level control and advanced features, suitable for high-performance applications, but has a high learning threshold and requires manual memory and type safety management.


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