Sequences and Conversions Examples
Key Takeaway: Practice Python with 110+ runnable examples covering strings, lists, dicts, math, dates, OOP, and file I/O — complete with expected terminal outputs.
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Credible Resources:Python Tutorial · Python Compiler · Python 3 Official Documentation · JavaScript Examples
Python Program to Convert Decimal to Binary Using Recursion
Recursive conversion.
def tobin(n):
return '0' if n == 0 else (tobin(n//2).lstrip('0') + str(n%2))
print(tobin(10))1010
Python Program to Print the Fibonacci sequence
Generates Fibonacci numbers.
n = 10
a, b = 0, 1
out = []
for _ in range(n):
out.append(a)
a, b = b, a + b
print(out)[0, 1, 1, 2, 3, 5, 8, 13, 21, 34]
Python Program to Convert Decimal to Binary, Octal and Hexadecimal
Converts base representations.
n = 255 print(bin(n)) print(oct(n)) print(hex(n))
0b11111111 0o377 0xff
Python Program to Find ASCII Value of Character
Uses ord().
print(ord('A'))65
Python Program to Display Fibonacci Sequence Using Recursion
Uses recursive function.
def fib(n):
return n if n < 2 else fib(n-1) + fib(n-2)
print([fib(i) for i in range(10)])[0, 1, 1, 2, 3, 5, 8, 13, 21, 34]
Python Program to Find Sum of Natural Numbers Using Recursion
Recursive sum.
def sumN(n):
return n if n <= 1 else n + sumN(n-1)
print(sumN(10))55
Python Program to Find Factorial of Number Using Recursion
Recursive factorial.
def fact(n):
return 1 if n <= 1 else n * fact(n-1)
print(fact(5))120
Python Core Concepts & Decision Breakdown
| Category | Core Concepts | Primary Use Case | Official Docs |
|---|---|---|---|
| Primitives & Basics | int, float, str, bool | Basic arithmetic, logic checks, string formatting | Built-in Types |
| Data Structures | list, tuple, dict, set | Collections, lookup maps, data filtering | Data Structures |
| Control Flow | if/else, for, while, try/except | Iteration, conditional execution, error handling | Control Flow |
| OOP & Modular | def, class, lambda, import | Object orientation, modularization, reusability | Classes & OOP |
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Frequently Asked Questions
Learn Python by Practicing Examples
Hands-on practice is the fastest way to understand Python. Each example focuses on a single concept—from variables, strings, lists, and dictionaries to loops, functions, classes, exceptions, and file I/O. Modify examples, add new functions, and see how clean design leads to readable, maintainable code.
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Beginner-Friendly
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Practical Patterns
Practice lists, dicts, comprehensions, functions, classes, exceptions, and file handling.
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