Python Basics: Features, Operators and Built-in Functions

The features of Python that make it worth learning first include simple English-like syntax, dynamic typing, an interpreted execution model, multi-paradigm support and a standard library covering hundreds of use cases. Python runs unchanged on Windows, macOS and Linux, costs nothing to use, and according to the TIOBE Index 2025 holds the top global ranking with a rating above 23%.

• Key Takeaway 1: Python’s clean syntax and dynamic typing make it genuinely easy for beginners to write working code in hours, not weeks.
• Key Takeaway 2: Bitwise operators work directly on binary representations of integers, making them essential for systems programming, cryptography and ethical hacking.
• Key Takeaway 3: The built-in abs() and round() functions handle common numeric tasks without any imports.
• Key Takeaway 4: String slicing in Python is one of the most powerful and concise ways to extract substrings across any language.
• Key Takeaway 5: Type conversion with int() and user input with input() are the two most-used tools in any beginner Python script.

Key Features of Python That Make It Worth Learning First

The features of Python that stand out most are not just marketing points. They translate directly into faster learning curves and more productive coding sessions. Python enforces readable indentation, which means you cannot write spaghetti code even if you try. According to Stack Overflow’s Developer Survey 2024, Python is the most-used language among professional developers for the third consecutive year, and NASSCOM’s Tech Talent Report 2024 confirms that Python proficiency appears in over 60% of new technology job postings in India, a figure that has grown for five straight years.

Python is interpreted, so you run code line by line in a REPL without compiling. That instant feedback loop is invaluable when you are learning. It is also dynamically typed, meaning you do not declare variable types upfront. Python figures it out at runtime. For Indian students targeting data science, automation or cybersecurity roles, these features of Python language make it the most practical first language to learn.

Python Features List at a Glance

If you want to know which other skills pair well with Python programming features, check out the top skills every college student must learn before graduation.

Multi-Paradigm and Extensible Python Programming Features

You can write Python in an object-oriented style, a functional style, or plain procedural scripts. That flexibility means the language grows with you. Start with simple scripts, then move to classes, then to decorators and generators as your confidence builds.

Python also integrates cleanly with C, C++ and Java through libraries like Cython and Jython. That extensibility is why it sits at the core of machine learning frameworks like TensorFlow and PyTorch. Indian companies including Infosys, Wipro, TCS and Razorpay list Python as a core requirement for engineering roles, making these features of Python language directly relevant to your job search.

Operators in Python: Bitwise, Conditional and Beyond

Operators are the verbs of any programming language. Python gives you arithmetic, comparison, logical, assignment, membership, identity and bitwise operators. Most beginners learn arithmetic and comparison quickly. Bitwise and conditional operators trip people up, so let us cover them properly.

Python Bitwise Operators Explained

Bitwise operators in Python work on the binary (base-2) representation of integers. They are used heavily in cryptography, network programming, ethical hacking and low-level systems work. Each operator manipulates individual bits.

• & (AND) – returns 1 only where both bits are 1. Example: 5 & 3 = 1 (binary: 101 & 011 = 001)
• | (OR) – returns 1 where at least one bit is 1. Example: 5 | 3 = 7 (binary: 101 | 011 = 111)
• ^ (XOR) – returns 1 where bits differ. Example: 5 ^ 3 = 6 (binary: 101 ^ 011 = 110)
• ~ (NOT) – flips all bits. Example: ~5 = -6 due to two’s complement representation
• << (Left shift) – shifts bits left, effectively multiplying by powers of 2. Example: 5 << 1 = 10
• >> (Right shift) – shifts bits right, effectively dividing by powers of 2. Example: 5 >> 1 = 2

If you are studying ethical hacking or cybersecurity, understanding bitwise operators is not optional. Bit manipulation underpins encryption algorithms, permission flags and packet-level network analysis. Python makes it unusually readable compared to C.

Conditional Operators and Expressions in Python

Python does not have a traditional ternary operator like C’s condition ? a : b. Instead, it uses a conditional expression written as value_if_true if condition else value_if_false. It is concise and readable on a single line.

Python also has the python if not pattern, which is the idiomatic way to check for falsy values. Writing if not x: is cleaner than if x == False: or if x == []:. Python’s truthiness rules cover empty strings, zero, None, empty lists and empty dicts as falsy by default.

There is no increment operator in Python. You will not find x++ or x–. The standard approach is x += 1 and x -= 1. It is a deliberate design choice that keeps the syntax unambiguous.

Built-in Functions: abs(), round(), Input and Type Conversion

Python ships with 68 built-in functions. You do not import them; they are always available. Four of the most commonly used ones for beginners are abs(), round(), input() and int(). Getting comfortable with these four will cover a large percentage of early Python scripts.

abs() in Python

The abs() function returns the absolute value of a number. Absolute value means the distance from zero, always non-negative. Pass it an integer, float or complex number and it returns the magnitude.

• abs(-7) returns 7
• abs(3.14) returns 3.14
• abs(-3.14) returns 3.14
• abs(3+4j) returns 5.0 (the modulus of the complex number)

You will use abs() when calculating distances, differences between values, or any scenario where direction does not matter but magnitude does. It is a one-liner that saves you writing conditional logic.

Python round() Function

The round() function rounds a number to a specified number of decimal places. The basic syntax is round(number, ndigits). If you skip ndigits, Python rounds to the nearest integer.

• round(3.7) returns 4
• round(3.14159, 2) returns 3.14
• round(2.5) returns 2 – Python uses banker’s rounding (round half to even)
• round(3.5) returns 4

Banker’s rounding surprises many beginners. Python does not always round 0.5 up. It rounds to the nearest even number, which reduces cumulative rounding errors in financial and statistical calculations. Keep that in mind when you are building anything involving money or scores.

Python Substring Using Slicing

Python does not have a dedicated substring function. Instead, it uses slicing, written as string[start:end:step]. The start index is inclusive, the end index is exclusive.

• “Python”[0:3] returns “Pyt”
• “Python”[2:] returns “thon”
• “Python”[:4] returns “Pyth”
• “Python”[::-1] returns “nohtyP” (reversed string)

Slicing works identically on lists, tuples and any sequence type. It is one of the features of Python that developers from other languages genuinely envy. Once you internalise the start:end:step pattern, you will use it constantly.

Converting a String to an Integer and Handling Input

The input() function in Python 3 reads user input from the keyboard and always returns a string. This catches beginners off guard when they try arithmetic on what they expect to be a number.

To convert that string to an integer, wrap it with int(). The pattern x = int(input(“Enter a number: “)) is the standard one-liner you will write in almost every beginner script. For floats, use float(input(…)) instead.

A quick note on history: raw_input() existed in Python 2. Python 3 removed it and merged its behaviour into input(). If you see raw_input in older tutorials, you are reading Python 2 code. For taking array input in Python, the common pattern is a list comprehension: arr = [int(x) for x in input().split()].

For working professionals and students exploring what Python can do for their careers, top online courses for high-salary jobs in 2025 covers which Python specialisations command the best salaries in India right now. If you are still weighing your options, the best career options in 2026 for students and professionals gives you a broader picture of where Python fits.

If you are mapping out your path after graduation, choosing the right career path after graduation is worth reading alongside this guide. There is also a growing set of entry-level jobs for teens and fresh graduates where Python is the primary skill employers ask for.

If cost is a concern, plenty of solid free resources exist. The best free online learning platforms for students in 2025 lists vetted options where you can practise Python without spending a rupee. Once you are ready to go deeper, 3.0 University’s certification courses take you into applied territory.

Frequently Asked Questions

What are the key features of Python?

The key features of Python include simple, readable syntax, dynamic typing, an interpreted execution model, multi-paradigm support (OOP, functional and procedural), a large standard library and cross-platform compatibility. Python runs unchanged on Windows, macOS and Linux. According to the TIOBE Index 2025, Python holds the top spot globally with a rating above 23%, reflecting its broad adoption across data science, web development and cybersecurity.

What is Python used for?

Python is used for web development, data science, machine learning, automation, cybersecurity, ethical hacking, scripting and API development. In India, it is the primary language for roles at companies like Infosys, Wipro, Razorpay and dozens of AI startups. Its readable syntax and extensive library ecosystem make it suitable for both beginner projects and enterprise-scale applications.

Why is Python so popular in India?

Python is popular in India because it has a low learning curve, is free to use, and directly maps to high-demand job roles in data science, automation and cybersecurity. According to NASSCOM’s Tech Talent Report 2024, Python proficiency appears in over 60% of new technology job postings in India. Government digital initiatives and the growth of Indian AI startups have accelerated that demand further.

Is Python free to use?

Yes, Python is completely free to use, modify and distribute. It is open-source software maintained by the Python Software Foundation. There are no licensing fees for students, startups or enterprises. PyPI, the Python package index, hosts over 500,000 free packages (PyPI stats, 2025), meaning you can build almost any application without paying for third-party tools.

What are bitwise operators in Python?

Bitwise operators in Python manipulate integers at the binary (bit) level. The six operators are AND (&), OR (|), XOR (^), NOT (~), left shift (<<) and right shift (>>). They are used in cryptography, network programming and systems-level tasks. For example, 5 & 3 gives 1 because only the rightmost bit is shared between binary 101 and 011.

What does the abs() function do in Python?

The abs() function returns the absolute value of a number, which is always non-negative. It works with integers, floats and complex numbers. abs(-9) returns 9, abs(-2.5) returns 2.5, and abs(3+4j) returns 5.0. It is a built-in function, so no import is needed. Use it whenever you need magnitude without caring about sign or direction.

How do you round a number in Python?

Use the built-in round(number, ndigits) function. round(3.14159, 2) returns 3.14. If you omit ndigits, Python rounds to the nearest integer. Python uses banker’s rounding (round half to even), so round(2.5) gives 2 and round(3.5) gives 4. This behaviour reduces cumulative rounding errors in financial and statistical calculations.

How do you convert a string to an integer in Python?

Use the int() function. int(“42”) returns the integer 42. When reading keyboard input, the standard pattern is x = int(input(“Enter a number: “)) because input() always returns a string in Python 3. If the string contains a decimal, use float() first or it will raise a ValueError. For lists of numbers, use [int(x) for x in input().split()].

Python basics are not just an academic exercise. Every concept covered here, from the features of Python to bitwise operators, abs(), round(), slicing and type conversion, shows up in real scripts, real interviews and real jobs. The best way to cement these is to write code daily, even if it is just 20 lines. Pick a small problem, solve it in Python, then refactor it to be cleaner.

If you are ready to go beyond syntax and build industry-recognised skills, 3.0 University’s online certification courses in Cybersecurity, Ethical Hacking, AI, Blockchain and Web3 are built for exactly that. They are practical, current and designed for students, fresh graduates and working professionals in India who want credentials that hold up in a competitive job market.

Last updated: June 2025. Reviewed by the 3University editorial team.