The Journal
Practical SQL, Python, data science and AI guides, written from real practice — not just to rank.
Python Iterators and Generators Explained
Python iterators and generators explained: iter, next, yield, lazy evaluation and pipelines, with real code, output and practice…
Shallow Copy vs Deep Copy in Python
Shallow copy vs deep copy in Python: what each does, how nested lists and dicts behave, and when…
Mutable vs Immutable Objects in Python
Mutable vs immutable objects in Python: which types change in place, how variables really work and the bugs…
Python *args and **kwargs Explained
Python *args and **kwargs explained: accept any number of arguments, unpack lists and dicts in calls, and keyword-only…
Python Functions: Arguments, Return and Scope
Python functions explained: def, arguments, default values, return vs print and variable scope, with real code and output…
Python List Comprehension Explained Simply
Python list comprehension explained simply: filter, transform, if-else, nested loops, set and dict versions, with real code, output…
Python Loops: for, while, break and continue
Python loops explained: for, while, range, enumerate, break, continue and loop else, with real code and output, common…
Python Dictionaries Explained With Examples
Python dictionaries explained: create, read, update and loop over key-value pairs, count and group items, with real code…
Python List vs Tuple vs Set: Key Differences
List vs tuple vs set in Python: differences in order, changeability and duplicates, set operations and when to…