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Top 21 Python Interview Questions to Hire Python Developers

January 18, 2022 No Comments

Get into the Python community and start expanding your knowledge. By getting a sound grasp of the theory and putting it into practice. The questions here will do a good job of preparing you as far as theory goes, but don’t neglect actually coding python programs for interviews. All of the Python is an object and all variables hold references to the object. The reference values are according to the functions; as a result, the value of the reference cannot be changed.

The reverse process of pickling is known as unpickling i.e. retrieving original Python objects from a stored string representation. While two equal immutable objects’ reference variables share the same address, it is possible to create two mutable objects with the same content. If you strong with the coding check it out with the technical part. Here are set of top technical questions which will help you to crack the interview in the easier way.

Mid-Level Python Interview Questions

A function is a block of code that performs a specific task whereas a decorator is a function that modifies other functions. In Python 3, the old Unicode type has replaced by “str” type, and the string is treated as Unicode by default. We can make a string in Unicode by using art.title.encode(“utf-8”) function.

This makes tuples faster and safer than lists, as they cannot be modified by other parts of the code accidentally. This is one of the most commonly asked python interview questions. In dynamically typed languages, types for variables need not be defined before using them. Provides a lot of functionality in lesser lines of code compared to other programming languages like Java, C++, etc. Equivalent to constructors in OOP terminology, __init__ is a reserved method in Python classes. The __init__ method is called automatically whenever a new object is initiated.

What are the different types of operators in Python?

Of course, Python requirements for data scientists are different from those for software engineers and developers. Data scientists should be comfortable with basic Python syntax, built-in data types, and the most popular libraries for data analysis. These are the topics that are usually covered in the Python interview questions for data science. Python is a high-level, interpreted, general-purpose programming language. Being a general-purpose language, it can be used to build almost any type of application with the right tools/libraries.

In this topic, we’ve covered a wide range of applications in which Python plays a critical part in their development. We’ll study more about Python principles in the upcoming tutorial. Putting machine learning algorithms into practice requires a lot of arithmetic.

How can you generate random numbers?

Slicing refers to the mechanism to select the range of items from sequence types like lists, tuples, strings. A Pythonpath tells the Python interpreter to locate the module files that can be imported into the program. It includes the Python source library directory and source code directory. You can preset Pythonpath as a Python installer. 20 most popular Kotlin interview questions with answers from our certified technical interviewer and senior software engineer Nikita Shevtsiv. CPU-bound operations such as parsing, image processing, string manipulation, and algorithms involving heavy calculations.

Obviously, this is not the case as they are just taking turns while using the same CPU core. GIL passing adds to the overall overhead to the execution. A specific change made in Python syntax to alter the functions easily are termed as Python decorators. Python Enhancement Proposal or pep 8 is a set of rules that specify how to format Python code for maximum readability. Positive indices are applied when the search begins from left to right. In negative indices, the search begins from right to left.

What are the different functions that can be used by grouby in pandas ?

The Microsoft Open Database Connectivity is an interface for the C programming language. It is the standard for all APIs using database C. The different Python ODBC modules are pyodbc, PythonWin ODBC, and MxODBC.

• If you know how to use Python, you’ll be able to import libraries on top of the code.
• Note that with good preparation, challenging questions feel like engaging questions.
• Standard apps are not the same as business applications.
• Simply by passing the string as an argument to the list would result in a string-to-list conversion.
• Python is a programming language that may be used to create desktop GUI apps, websites, and online applications.
• Write a code to create a single string from elements in a list.

The programmer does not have access to this private heap. The python interpreter takes care of this instead. It is immutable, so no change is reflected in the original data. It uses () brackets https://wizardsdev.com/en/vacancy/middle-python-developer/ rather than [] square brackets to create a tuple. We cannot remove any element but can find in the tuple. It also allows traversing elements in reverse order by using negative indexing.

How does inheritance work in python? Explain it with an example.

The __init__ is a method or constructor in Python. This method is automatically called to allocate memory when a new object/ instance of a class is created. The anonymous function in python is a function that is defined without a name. The normal functions are defined using a keyword “def”, whereas, the anonymous functions are defined using the lambda function. The anonymous functions are also called as lambda functions. In Python, some amount of coding is done at compile time, but most of the checking such as type, name, etc. are postponed until code execution.

A Python dictionary is a collection of items in no particular order. Python dictionaries are written in curly brackets with keys and values. Dictionaries are optimised to retrieve values for known keys. A dictionary can be directly passed as an argument to the DataFrame() function to create the data frame. A pandas groupby is a feature supported by pandas that are used to split and group an object. Like the sql/mysql/oracle groupby it is used to group data by classes, and entities which can be further used for aggregation.

Top 10 Android Developer Interview Questions

July 7, 2021 No Comments

Any kind of configuration change in Android devices tends to recreate the whole activity of the application. It means the data will be lost if it has not been saved and restored properly from the activity which was destroyed. To avoid these issues, it is recommended to store all UI data in the ViewModel instead of an activity. Developing an android application involves several processes that happen sequentially.

With the use of inheritance the information is made manageable in a hierarchical order. Yes, an interface can implement another interface , but it needs to use extends, rather than implements keyword. And while you can not remove methods from parent interface, you can add new ones freely to your sub-interface. OnSavedInstanceState() – This method is used to store data before pausing the activity.

Situational interview questions

For example, using your Android-powered phone as a Wi-Fi Hotspot, you can use your laptop to connect to the Internet using that access point. You then drag it downwards to the lower part of the screen where a remove button appears. It is modular in a sense that you can move around or combine with other fragments in a single activity. Intents displays notification messages to the user from within the Android enabled device. It can be used to alert the user of a particular state that occurred.

It is used in Android Applications when an item needs to be created just once and used across the board. The main reason for this is that repeatedly creating these objects, uses up system resources. The identical object should therefore only be created once and used repeatedly. It is utilized in situations where we only require a single instance of the class, such as with network services, databases, etc.

How would you implement swipe animation in Android

Components that provide users with screens on which they can interact with objects and perform actions. Objects that initiate actions from other app components, either within your program or through another piece of software on the device . Google has changed the lives of everyone by launching a product that improves the mobile experience for everyone.

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Briefly describe some ways that you can optimize View usage

One technique is to create a child thread to prevent the Android system from concluding a code that has been unresponsive for a long period of time. Most of the actual workings of the codes can be placed within the child thread to ensure that the main thread runs with minimal unresponsive time. Activity is the equivalent of a Frame/Window in GUI toolkits.

Advanced Android interview questions are an opportunity to showcase your advanced knowledge, and also your leadership skills and creativity. In this case, lay out some testing fundamentals to start , and then shift into a discussion of your preferred testing approaches to demonstrate your problem-solving capabilities. A project under Android development, upon compilation, becomes an .apk file. This apk file format is actually made up of the AndroidManifest.xml file, application code, resource files, and other related files.

Q7. What is the life cycle of android activity?

The server manages communication between the client and the ADB daemon running on an emulator or device. You can invoke a client from a shell by issuing an ADB command. Fragment is a modular section of an activity, with its own lifecycle and input events, and which can be added or removed at will. Broadcast receiver is used by the application whenever they need to perform the execution based on system events. For background task-intensive apps, you can alleviate pressure from the UI thread by using the IntentService.

• AAPT – It is a build tool that gives the ability to developers to view, create, and update ZIP-compatible archives .
• When default resources, which contain default strings and files, are not present, an error will occur and the app will not run.
• Instead of creating new view for each new row, an old view is recycled and reused by binding new data to it.
• A thread is a single sequential flow of control within a program.
• An application that runs smoothly on one version of the Android OS might crash on another Android OS.

Activity in java is a single screen that represents GUI with which users can interact in order to do something like dial the phone, view email, etc. Content providers − This will share the data between various applications. Explain in detail about the important file and folders used when you create a new Android application. It rarely happens, but sometimes, there are projects that I could not meet certain deadlines. That’s why I strongly believe that proper planning and documentation are very important.

What’s Android SDK and its Components?

A way around repeated use of findViewById() is to use the “view holder” design pattern. Normal — A lower-risk permission that gives requesting applications access to isolated application-level features, with minimal risk to other applications, the system, or the user. The system automatically grants this type of permission to a requesting application at installation, without asking for the user’s explicit approval. Activities are basically containers or windows to the user interface.

Thread should be used to separate long running operations from main thread so that performance is improved. But it can’t be cancelled elegantly and it can’t handle https://wizardsdev.com/en/vacancy/android-developer/ configuration changes of Android. The onStart() method is called whenever the Activity becomes visible to the user, typically after onCreate() or onRestart().