Table of contents
- Q: What is Python?
- Q: What are the key features of Python?
- Q: Explain the difference between a list and a tuple in Python.
- Q: What is PEP 8?
- Q: What is the purpose of "if name == 'main'" in Python scripts?
- Q: What is the difference between a shallow copy and a deep copy in Python?
- Q: What is a decorator in Python?
- Q: What is the difference between a generator and a normal function?
- Q: Explain the Global Interpreter Lock (GIL) in Python.
- Q: What is the purpose of the "self" parameter in Python class methods?
- Q: How do you handle exceptions in Python?
- Q: What are Python decorators used for?
- Q: What is a lambda function in Python?
- Q: How do you open and read from a file in Python?
- Q: How do you handle file-handling errors in Python?
- Q: What is the purpose of the "pass" statement in Python?
- Q: How can you remove duplicates from a list in Python?
- Q: How do you perform unit testing in Python?
- Q: What is the purpose of the "join()" method in Python strings?
- Q: How do you install third-party packages in Python?
Q: What is Python?
A: Python is a high-level, interpreted programming language known for its simplicity and readability.
Q: What are the key features of Python?
A: Key features of Python include its simplicity, readability, support for multiple programming paradigms, extensive standard library, and wide range of third-party modules.
Q: Explain the difference between a list and a tuple in Python.
A: Lists are mutable, meaning their elements can be modified, added, or removed. Conversely, Tuples are immutable, and their parts cannot be changed once defined.
Q: What is PEP 8?
A: PEP 8 is a style guide for Python code, providing guidelines and best practices for writing clean and readable Python programs.
Q: What is the purpose of "if name == 'main'" in Python scripts?
A: It allows the code within the block to run only when the script is executed directly and not when it is imported as a module.
Q: What is the difference between a shallow copy and a deep copy in Python?
A: A shallow copy creates a new object that references the original data, while a deep copy creates a new object with a completely independent copy of the original data.
Q: What is a decorator in Python?
A: A decorator is a design pattern allowing you to dynamically add functionality to an existing function without modifying its source code.
Q: What is the difference between a generator and a normal function?
A: A generator function uses the "yield" keyword to return values one at a time, whereas a normal function returns a single value and terminates.
Q: Explain the Global Interpreter Lock (GIL) in Python.
A: The GIL is a mechanism in CPython (the reference implementation of Python) that allows only one thread to execute Python bytecode at a time, which prevents accurate parallel execution of threads.
Q: What is the purpose of the "self" parameter in Python class methods?
A: The "self" parameter refers to the instance of the class and is used to access its attributes and methods within the class.
Q: How do you handle exceptions in Python?
A: Exceptions in Python can be handled using the "try-except" block, where the code that might raise an exception is placed within the "try" block, and the corresponding exception handling code is placed within the "except" block.
Q: What are Python decorators used for?
A: Python decorators are used to modify the behaviour of functions or classes. They allow you to wrap a function or class with additional functionality without directly modifying its code.
Q: What is a lambda function in Python?
A: A lambda function is a small anonymous function defined using the lambda keyword. It can take any number of arguments but can only have one expression.
Q: How do you open and read from a file in Python?
A: To open and read from a file in Python, you can use the built-in "open()" function with the appropriate file mode, such as "r" for reading. Then, you can use methods like "read()", "readline()", or "readlines()" to read the contents of the file.
Q: How do you handle file-handling errors in Python?
A: File handling errors in Python can be handled using the "try-except" block. By catching specific exceptions like "FileNotFoundError" or "PermissionError", you can handle the errors gracefully.
Q: What is the purpose of the "pass" statement in Python?
A: The "pass" statement is a placeholder statement in Python that does nothing. It is commonly used as a placeholder in empty code blocks or as a stub for unfinished code.
Q: How can you remove duplicates from a list in Python?
A: One way to remove duplicates from a list is by converting it into a set using the "set()" function. Sets automatically eliminate duplicate elements. You can then convert the setback to a list if required.
Q: How do you perform unit testing in Python?
A: Python provides a built-in module called "unittest" for unit testing. You can create test cases by subclassing "unittest.TestCase" and defining test methods. The "unittest" module provides various assertion methods to check the expected outcomes.
Q: What is the purpose of the "join()" method in Python strings?
A: The "join()" method is used to concatenate a list of strings into a single string. It takes an iterable as an argument and joins its elements using the string on which it is called.
Q: How do you install third-party packages in Python?
A: Third-party packages in Python can be installed using package managers like pip or conda. For example, you can use "pip install <package_name>" to install a package from the Python Package Index (PyPI).
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