1. What is Python?
Python is a high-level, interpreted programming language that is widely used for general-purpose programming, web development, scientific computing, data analysis, and artificial intelligence. It was first released in 1991 and is now one of the most popular programming languages in the world.
2. What are the benefits of using Python?
Some of the key benefits of using Python include its ease of use, readability, portability, vast library of modules and frameworks, dynamic typing, and support for multiple programming paradigms such as object-oriented, functional, and procedural programming.
3. What is PEP 8?
PEP 8 is a style guide for Python code that provides guidelines and best practices for writing readable, maintainable, and consistent code. It covers topics such as naming conventions, indentation, spacing, and commenting.
4. What are decorators in Python?
Decorators are a feature in Python that allow you to modify the behavior of a function or class without changing its source code. Decorators are implemented as functions that take another function or class as input and return a new function or class with modified behavior.
5. What is a Python module?
A Python module is a file containing Python code that defines functions, classes, and other objects that can be used in other Python programs. Modules are used to organize code, share code between programs, and prevent naming conflicts.
6. What is a lambda function in Python?
A lambda function is a small, anonymous function in Python that can take any number of arguments, but can only have one expression. Lambda functions are often used as a quick and easy way to define small, throwaway functions.
7. What is a generator in Python?
A generator in Python is a special type of function that can be used to generate a sequence of values on-the-fly, without generating the entire sequence in memory at once. Generators are useful for working with large datasets or infinite sequences of data.
8. What is a virtual environment in Python?
A virtual environment in Python is a self-contained directory that contains a specific version of the Python interpreter and any additional modules or packages needed for a specific project. Virtual environments are used to isolate different projects from each other and to ensure that each project uses the correct version of Python and its dependencies.
9. What is the difference between a list and a tuple in Python?
A list is a mutable sequence of elements, whereas a tuple is an immutable sequence of elements. This means that you can add, remove, and modify elements in a list, but not in a tuple.
10. What is the difference between range and xrange in Python?
range and xrange are both used to generate a sequence of numbers in Python, but range generates a list of numbers in memory, whereas xrange generates the numbers on-the-fly as you iterate over them. This means that xrange can be more memory-efficient for large sequences.
11. What is the difference between a shallow copy and a deep copy in Python?
A shallow copy of a Python object creates a new object that references the same memory locations as the original object, whereas a deep copy creates a new object with its own copy of all the data. This means that changes to the original object will affect a shallow copy, but not a deep copy.
12. What is a module in Python?
A module in Python is a file containing Python code that defines functions, classes, and other objects that can be used in other Python programs. Modules are used to organize code, share code between programs, and prevent naming conflicts.
13. What is a package in Python?
A package in Python is a collection of modules that are organized into a directory hierarchy. Packages are used to organize and share large sets of related modules and provide a namespace for the modules within them.
14. What is the Global Interpreter Lock (GIL) in Python?
The Global Interpreter Lock (GIL) is a mechanism in Python that prevents multiple threads from executing Python bytecodes simultaneously. This means that only one thread can execute Python code at a time, even on multi-core CPUs. The GIL is designed to prevent race conditions and other thread-related issues, but can also limit the performance of multi-threaded Python programs.
15. What is a list comprehension in Python?
A list comprehension is a concise way to create a new list in Python by applying an expression to each element of an existing list or iterable. List comprehensions are often used as a shorthand way to filter and transform data in Python.
16. What is the difference between a function and a method in Python?
A function in Python is a standalone block of code that takes inputs and returns outputs, whereas a method is a function that is associated with an object and can access and modify its state. Methods are defined inside classes and are called on instances of the class.
17. What is a decorator in Python?
A decorator is a function that takes another function as input and returns a modified version of the input function. Decorators are often used to add functionality to an existing function without modifying its source code.
18. What is the difference between a local variable and a global variable in Python?
A local variable is a variable that is defined inside a function and can only be accessed within that function, whereas a global variable is a variable that is defined outside of any function and can be accessed from anywhere in the program.
19. What is a lambda function in Python?
A lambda function is an anonymous function in Python that can be defined on a single line of code. Lambda functions are often used to define small, one-off functions that are passed as arguments to other functions.
20. What is the difference between a set and a frozenset in Python?
A set is an unordered collection of unique elements, whereas a frozenset is an immutable set. This means that you can add, remove, and modify elements in a set, but not in a frozenset.
21. What is a generator in Python?
A generator is a type of iterator in Python that generates values on-the-fly as they are requested, rather than generating all values at once and storing them in memory. Generators are often used to generate large sequences of values or to perform operations on large datasets in a memory-efficient way.
22. What is the difference between the append() and extend() methods of a list in Python?
The append() method adds a single element to the end of a list, whereas the extend() method adds multiple elements to the end of a list. The elements added with extend() must be iterable.
23. What is the difference between the pass, continue, and break statements in Python?
The pass statement does nothing and is used as a placeholder when no action is required. The continue statement skips to the next iteration of a loop. The break statement immediately exits the loop.
24. What is the purpose of the __init__ method in a Python class?
The __init__ method is a special method in a Python class that is called when an object of the class is created. It is used to initialize the object's attributes and perform any other setup that is required.
No comments:
Post a Comment