30 Days of Python 🐍

Working through @Asabeneh's 30-Days-Of-Python challenge at my own pace.

I'm a finance professional transitioning toward data and AI. Python is the foundation. This repo is my honest, unfiltered learning log — no skipping, no faking progress.

---

Progress

Day	Topic	Status
Day 01	Introduction — Syntax, Data Types, Arithmetic	✅ Done
Day 02	Variables, Built-in Functions	✅ Done
Day 03	Operators	✅ Done
Day 04	Strings	✅ Done
Day 05	Lists	✅ Done
Day 06	Tuples	✅ Done
...	...	...

---

Day 01 — Introduction

What I covered:

• Basic arithmetic operators: +, -, *, /, **, %, //
• Data types: int, float, complex, string, list, dict, set, tuple, bool
• Used type() to inspect values
• Calculated Euclidean distance using pure arithmetic

File: Day01/Day1.py

Day 02 — Variables and Built-in Functions

What I covered:

• Declaring variables and assigning values (str, int, float, bool)
• Multiple assignment on a single line
• Built-in functions: type(), len(), input(), float(), help()
• All seven arithmetic operators applied to variables
• Calculated circle area and circumference from user input

Files: Day02/Day2.py · Day02/Day02_Notes.md

Day 03 — Operators

What I covered:

• Number types: int, float, complex
• Geometry calculations: triangle area/perimeter, rectangle area/perimeter, circle area/circumference
• Slope and Euclidean distance between two points
• Solving y = x² + 6x + 9 by testing x values
• String membership with in and not in
• Type conversion chain: int → float() → str()
• Divisibility check with modulus: n % 2 == 0

Files: Day03/day3.py · Day03/Day3_Notes.md

Day 04 — Strings

What I covered:

• String length with len(), concatenation with +
• Case methods: upper(), lower(), capitalize(), title(), swapcase()
• Slicing: index access, negative indexing, range slices
• Search methods: in, startswith(), endswith(), index(), find(), rindex(), rfind()
• replace(), split(), strip()
• Acronym generation with a generator expression and join()
• isidentifier(), escape sequences (\n, \t)
• String formatting with .format() and {:.2f} for decimal control

Files: Day04/day4.py · Day04/day4_Notes.md

Day 05 — Lists

What I covered:

• List creation with list() and []; ordered, mutable, duplicates allowed
• Indexing, negative indexing, and computed middle index (len(lst)//2)
• Slicing: lst[start:stop], lst[-3:], lst[::-1] for a reversed copy
• Mutating: append(), insert(), slice-insert lst[i:i] = [x, y]
• List concatenation with +; joining to a string with 'sep'.join(lst)
• sort() / sort(reverse=True) in place vs sorted() (new list)
• reverse(), pop(), remove(), clear(), del
• Median from a sorted list; abs() for unsigned deviation
• Splitting a list into halves; star unpacking a, b, *rest = lst
• Four collection types compared: list, tuple, set, dict

Files: Day05/day5.py · Day05/day5_Notes.md

Day 06 — Tuples

What I covered:

• Tuples are ordered and immutable — no add, insert, or remove
• Single-element tuple requires a trailing comma: ("Fatima",) not ("Fatima")
• Concatenation with + returns a new tuple
• len(), indexing, negative indexing, and slicing work the same as lists
• Unpacking: a, b, c = tpl — must match length exactly
• tpl[len(tpl)//2] gives the middle item index, not a numeric average
• Convert to list with list() when mutation is needed
• del tpl removes the whole tuple — can't delete individual items
• Membership check with in

Files: Day06/day6.py · Day06/day6_Notes.md

---

Following the curriculum from Asabeneh/30-Days-Of-Python. All solutions are my own work.