Share 7 Python development engineer interview questions

do you know? In fact, Python was born as early as the early 1990s, but it has not been popular for a long time. As far as the editor is concerned, I only learned about it in the past few years. According to statistics, the current salary of Python developers is more than 10K. It is difficult to refuse such a temptation, so many people have learned Python in recent years.

Python is an interpreted scripting language that focuses on readability and efficiency, especially compared to languages ​​like Java, PHP and C. These two advantages make it very popular among developers, and it is also widely used in automated operation and maintenance scenarios in the field of operation and maintenance. Today, Python is used in a wide range of fields, including artificial intelligence, graphics processing, database programming, network programming, Web programming, multimedia applications, etc. By the way, why are so many companies recruiting Python developers now? The main reason is that the various advantages of Python have led major companies to start using Python development, which has caused a shortage of Python development talents, and the corresponding salaries of Python developers have also increased. Let me share with you a wave of related interview questions:

Recommended related articles: "2020 python interview questions summary (latest)"

NO.1 What are the built-in data types of Python?

Integer--int Boolean--bool

String--str List--list

Tuple--tuple Dictionary--dict

NO.2What is the difference between range(100) in Python2 and Python3?

python2 returns a list, python3 returns an iterator, saving memory

NO.3 Briefly describe the difference between __new__ and __init__ in object-oriented?

__init__ is the initialization method. After the object is created, it is called by default immediately and can receive parameters.

1. __new__ must have at least one parameter cls, representing the current class. This parameter is automatically recognized by the Python interpreter during instantiation

2. __new__ must have a return value and return the instantiated instance. Pay special attention to this when implementing __new__ yourself. You can return An instance from __new__ of the parent class (through super (current class name, cls)), or an instance directly from __new__ of object

3. __init__ has a parameter self, which is this __new__ The returned instance, __init__ can complete some other initialization actions based on __new__, __init__ does not need to return a value

4. If __new__ creates an instance of the current class, it will be called automatically __init__ function, the first parameter of the __new__ function called in the return statement is cls to ensure that it is the current class instance. If it is the class name of another class, then the actual creation and return are instances of other classes. In fact The __init__ function of the current class will not be called, nor will the __init__ function of other classes be called.

NO.4 Please tell me how to generate random integers, random decimals, and decimals between 0--1 in python?

Random integers: random.randint(a,b), generate integers in the interval

Random decimals: used to use numpy library, generated using np.random.randn(5) 5 random decimals

0-1 Random decimal: random.random(), no parameters are passed in brackets

##NO.5 Avoid transfer Which letter should be added to the string to represent the original string?

r means that the original string is required and special characters are not escaped

Examples of assertion methods in python

assert() method, if the assertion is successful, the program will continue to execute. If the assertion fails, the program will report an error

NO.6 Explain in one sentence what kind of language can use decorators?

Languages ​​where functions can be passed as parameters, decorators can be used

NO.7 Briefly explain what the with method does to open the processing file for us?

Open Some abnormal situations may occur when the file is read and written. If we follow the conventional f.open

writing method, we need to try, except, and finally to make exception judgments, and no matter what situation the file encounters in the end, We must execute finally f.close() to close the file. The with method helps us realize f.close in finally

The above is the interview questions compiled by the editor today. Do you all understand it? Friends who don’t know should study it carefully, work hard and practice more to make your Python programming skills even better. In this way, no matter how difficult the interviewer asks, it will be a piece of cake for you. Let’s pick it up. Keep your sleeves up!

[Recommended courses:

Python related courses, Python3 related courses]

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