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Python / Core Python Fundamentals Interview Questions

What is Python and what makes it popular for software development?

Python is a high-level, interpreted, general-purpose programming language created by Guido van Rossum and first released in 1991. Its defining feature is readability: the syntax is clean and close to plain English, which dramatically lowers the learning curve compared with languages like C++ or Java.

What makes it genuinely popular rather than just beginner-friendly is the breadth of its ecosystem. The same language is used to write a two-line script that renames files and to train large neural networks. CPython (the reference implementation) runs on every major OS, and the standard library ships batteries-included — file I/O, networking, JSON, datetime, and much more without installing anything extra.

Python is dynamically typed and uses automatic memory management through garbage collection, so developers spend less time managing types and memory and more time solving problems. The Global Interpreter Lock (GIL) in CPython limits true multi-threading but has little practical impact for I/O-bound work, which covers most web services and data pipelines.

In interviews the three things worth emphasising are: interpreted execution (no compile step), dynamic typing, and the massive package ecosystem (PyPI hosts over 500,000 packages). Each of those shapes everyday development decisions.

Python code runs without a separate compile step because Python is…
Which Python component is responsible for enforcing one thread executes Python bytecode at a time?

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What is Python and what makes it popular for software development? How do variables work in Python, and what does dynamic typing mean? How do conditional statements work in Python? How does the for loop work in Python, and what is the role of range()? When should you use a while loop instead of a for loop in Python? What is a Python list and what operations are most commonly used? What is a tuple in Python and when should you choose it over a list? How do Python dictionaries work and what are the most important operations? What is a Python set and what makes it useful for membership testing? How do you define and call a function in Python? What is variable scope in Python and how does the LEGB rule work? How does exception handling work in Python using try/except? What are the different ways to format strings in Python, and which is preferred? What is list comprehension and how does it differ from a regular for loop? What are *args and **kwargs in Python function definitions? What is a lambda function in Python and when is it appropriate to use one? What is the mutable default argument trap in Python and how do you fix it? How do you use dictionary comprehension to transform data payloads in Python? How does slicing work in Python for lists, strings, and tuples? What is tuple unpacking and extended unpacking in Python? What do the pass, break, and continue statements do in Python loops? What is None in Python, and when should you use 'is' versus '=='? How do you work with nested data structures such as a list of dictionaries? What is a generator in Python and how does it differ from a list? What is a decorator in Python and how do you write one? How do you define a class in Python, and what is the role of __init__? How does inheritance work in Python and what is method resolution order (MRO)? How do you read from and write to files in Python? How do Python modules and imports work? Which Python built-in functions are most important to know for coding interviews? How does Python determine whether a custom object is truthy or falsy? What is the difference between a shallow copy and a deep copy in Python? Which Python string methods are most useful for cleaning and parsing data payloads? How do enumerate() and zip() make loops more Pythonic? What is the Python exception class hierarchy and how do you create custom exceptions? What is the walrus operator (:=) and when is it useful? How does Python's sort work, and what is the difference between sort() and sorted()? What are Python dataclasses and when should you use them instead of regular classes? What is a context manager in Python and how do you implement one? How do Python type hints work and how do you use them in function signatures? Can you create a tuple comprehension in Python, and what is a generator expression? How does recursion work in Python and what are its limitations? How do you parse and build JSON payloads in Python? Why should you use Python's logging module instead of print() in production code? What is PEP 8 and which conventions does it define for Python code?
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