Python
Operator Precedence and Associativity
Precedence decides which operator runs first and associativity decides the direction when two have equal rank. Both are worth knowing, and brackets ar...
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
Boolean Logic, Truthy and Falsy Values
Every Python object is either truthy or falsy, the falsy list is short and closed, and knowing it lets conditions read as plain English.
Python
Python Strings: Creating, Indexing and Slicing
A string is an immutable ordered sequence of characters. Indexing reaches one character, slicing reaches a range, and negative numbers count from the...
Python
String Operations: Joining, Repeating, Searching and Comparing
Concatenation, repetition, membership testing, comparison and iteration - the operations that work on strings because a string is a sequence.
Python
Python String Methods You Will Actually Use
Case conversion, whitespace trimming, searching, counting and the is-something tests, organised by the job they do rather than alphabetically.
Python
Splitting, Joining and Processing Text
split turns text into a list, join turns a list back into text, and between those two calls sits most of the text processing you will ever write.
Python
String Formatting: f-strings, format() and %
Three formatting styles exist. f-strings are the one to use, and the format specification they share controls width, alignment, precision and thousand...
Python
Conditional Statements: if, elif and else
Conditions choose which block runs. Python adds chained comparisons, truthiness and a conditional expression that together remove most of the nesting...
Python
The for Loop and range()
A Python for loop walks over the items of a collection directly. range() supplies numbers when you genuinely need a counter, which is less often than...
Python
The while Loop
while repeats for as long as a condition holds. Use it when the number of repetitions is unknown, and make sure something inside the loop can make the...
Python
Loop Control: break, continue, pass and else
break leaves a loop, continue skips to the next iteration, pass does nothing, and the loop else runs only when no break happened.
Python
Pattern Programming with Nested Loops
Printing shapes with loops teaches nested iteration better than any explanation. Every pattern comes from the same three questions.