Python Interviews

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Pandas is a single-threaded library, utilizing only one CPU core. To achieve parallelism, Dask is required. In comparison, Polars automatically uses available CPU cores without additional setup.

⌨️ 50 Python Interview Q/A 💥

Python's map and filter functions are powerful tools. However, combining them can lead to complex nested calls. The Pipe library offers a more elegant solution with pipes, allowing for intuitive and readable operation chaining.

Official Python Docs https://docs.python.org/3/ Tools: http://docs.python-guide.org/en/latest/dev/virtualenvs/ http://www.pythonforbeginners.com/basics/python-pip-usage Practice: http://www.practicepython.org/ https://www.hackerrank.com https://wiki.python.org/moin/PythonDecorators Python GUI FAQ https://docs.python.org/3/faq/gui.html

Top 10 basic programming concepts 1. Variables: Variables are used to store data in a program, such as numbers, text, or objects. They have a name and a value that can be changed during the program's execution. 2. Data Types: Data types define the type of data that can be stored in a variable, such as integers, floating-point numbers, strings, boolean values, and more. Different data types have different properties and operations associated with them. 3. Control Structures: Control structures are used to control the flow of a program's execution. Common control structures include if-else statements, loops (for, while, do-while), switch statements, and more. 4. Functions: Functions are blocks of code that perform a specific task. They can take input parameters, process them, and return a result. Functions help in organizing code, promoting reusability, and improving readability. 5. Conditional Statements: Conditional statements allow the program to make decisions based on certain conditions. The most common conditional statement is the if-else statement, which executes different blocks of code based on whether a condition is true or false. 6. Loops: Loops are used to repeat a block of code multiple times until a certain condition is met. Common types of loops include for loops, while loops, and do-while loops. 7. Arrays: Arrays are data structures that store a collection of elements of the same data type. Elements in an array can be accessed using an index, which represents their position in the array. 8. Classes and Objects: Object-oriented programming concepts involve classes and objects. A class is a blueprint for creating objects, which are instances of the class. Classes define attributes (variables) and behaviors (methods) that objects can exhibit. 9. Input and Output: Input and output operations allow a program to interact with the user or external devices. Common input/output operations include reading from and writing to files, displaying output to the console, and receiving input from the user. 10. Comments: Comments are used to add explanatory notes within the code that are ignored by the compiler or interpreter. They help in documenting code, explaining complex logic, and improving code readability for other developers. Join for more: https://t.me/programming_guide ENJOY LEARNING 👍👍

❤️ The str method in Python classes is a special method used to define the behavior of the class when it is converted to a string representation. 1⃣ The Point class has a str method that is used to return a string representation of an instance. 2⃣ When we call print(str(p)), the str method of the instance p is invoked, and the desired string representation (here "Point(3, 4)") is returned. ✅The str method allows customizing the string representation of class instances, which is useful when you want a readable and meaningful representation of an object.

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How to print anything in Python 👇👇 https://youtu.be/3TVm0mzQfXw?si=VKS2xo4aaxbGaKy5

Functions in Python Functions are a fundamental part of Python (and most other programming languages). Python includes many built-in functions, but you can also create your own functions. A function is a block of code which only runs when it is called. You can pass data, known as parameters, into a function. A function typically performs a specific task that you can run in your program. For example, print() is a built-in Python function that allows you to display text to the screen. Calling print("Hello") results in Hello being displayed. One of the great things about functions is that they can be used like a "black box". You do not need to know how the function is coded in order to use it. In fact, you do not even need to see the function code before using it. All you need to know is how to call the function. You call a function by referring to its name, and providing any arguments that it might require. So calling print("Hello") calls the print() function and passes an argument of "Hello". Creating a function

Dictionary in Python Of all the built-in Python data types, the dictionary is easily the most interesting. It is the only standard mapping type, and it is the backbone of every Python object. A dictionary maps keys to values. Keys need to be hashable objects, while values can be of any arbitrary type. Dictionaries are also mutable objects. In Python, a dictionary is an unordered collection of items, with each item consisting of a key: value pair (separated by a colon). Creating Dictionary in Python You can create a dictionary by enclosing comma separated key: value pairs within curly braces {}. Like this: my_dict = {"Key1": "Value1", "Key2": "Value2"}

Lists In Python Python lists are containers used to store a list of values of any data type. In simple words, we can say that a list is a collection of elements from any data type. In Python, lists are mutable i.e., Python will not create a new list if we modify an element of the list. It works as a container that holds other objects in each order. We can perform various operations like insertion and deletion on list. A list can be composed by storing a sequence of different type of values separated by commas. Python list is enclosed between square [] brackets and elements are stored in the index basis with starting index 0.