Python
Python Lists: Creating, Indexing and Slicing
A list is an ordered, changeable sequence that can hold anything. Indexing, slicing and slice assignment cover most of what you will ever do with one.
Python
A complete core Python path: syntax, data types, operators, strings, control flow, collections, functions, exceptions, files, modules, the standard library, OOP, iterators, generators, decorators, internals, concurrency, regular expressions, testing, typing, performance, security, problem solving, projects, interview preparation and exams.
110 notes in 33 topics
Topics in Python
Basics 5
Data Types 4
Operators 5
Strings 5
Control Flow 5
Lists 3
Tuples 2
Sets 2
Dictionaries 3
Comprehensions 2
Functions 4
Advanced Functions 2
Recursion 2
Exception Handling 4
File Handling 4
Modules 3
Standard Library 6
OOP 5
Advanced OOP 5
Iterators and Generators 3
Decorators 2
Context Managers 1
Descriptors and Dataclasses 2
Python Internals 4
Concurrency 4
Regular Expressions 3
Serialization 2
Command Line Python 2
Testing and Debugging 3
Type Hints 2
Performance 3
Python Security 2
DSA with Python 6
Notes
Python
List Methods: Adding, Removing and Sorting
Most list methods change the list in place and return None. Knowing which ones return a value and which do not prevents the most common list bug.
Python
Nested Lists, Copying and List Patterns
Lists of lists model grids and tables, copying them needs care, and a handful of patterns cover most real list work.
Python
Python Tuples: Immutable Sequences
A tuple is a list that cannot change. That single restriction makes it usable as a dictionary key, safe to share, and the natural way to return severa...
Python
Tuple Unpacking and Multiple Assignment
Unpacking pulls a sequence apart into names in one statement. It powers swapping, loops over pairs, multiple return values and the star syntax.
Python
Python Sets: Unique Unordered Collections
A set stores unique values with no order and answers membership questions almost instantly. That trade - lose order, gain speed and uniqueness - is th...
Python
Set Operations: Union, Intersection and Difference
Four operations answer four everyday questions: what is in either, what is in both, what is only in the first, and what is in exactly one.
Python
Python Dictionaries: Keys, Values and Lookup
A dictionary maps keys to values and finds any value in roughly constant time. It is the most used container in Python and the structure most real dat...
Python
Dictionary Methods and Counting Patterns
setdefault, get with a default and the Counter class turn the most common dictionary jobs - counting, grouping and accumulating - into two or three li...
Python
Nested Dictionaries and Real Data Structures
Real data arrives as dictionaries inside dictionaries inside lists. Reaching into it safely, walking it and flattening it are skills worth practising...
Python
List and Set Comprehensions
A comprehension builds a collection from an expression and a loop, in one line. It reads left to right in the same order as the loop it replaces.
Python
Dictionary Comprehensions
The same syntax as a list comprehension, with a key and a value separated by a colon. It is the fastest way to build, filter, invert or reshape a mapp...