Get the current working directory
Write a Python program to get the current working directory. Step-by-step explanation, colour-coded code and real output.
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298 articles · page 17 of 25 · Clear filtersSet an environment variable
Write a Python program to set an environment variable for the current process. Step-by-step explanation, colour-coded code and real output.
List environment variables
Write a Python program to get the list of environment variables with `os.environ`. Step-by-step explanation, colour-coded code and real output.
Read an environment variable
Write a Python program to read an environment variable. Step-by-step explanation, colour-coded code and real output.
Python RegEx
Learn Python regular expressions with the re module: search, match, findall, sub and split, character classes, quantifiers, groups and flags, with examples.
Python Modules & pip
Learn Python modules and packages: import styles, create your own module, __name__ == "__main__", the standard library, pip install and virtual environments.
Python Polymorphism & Encapsulation
Learn Python polymorphism (duck typing, overriding, operator overloading) and encapsulation (private attributes, name mangling, @property setters).
Python Inheritance
Learn Python inheritance: parent and child classes, super(), method overriding, multilevel and multiple inheritance, MRO, isinstance and abstract base classes.
Python Iterators
Learn Python iterators: iterables vs iterators, iter() and next(), StopIteration, how for loops really work, custom iterator classes, and the itertools module.
Python Recursion
Learn recursion in Python: base case and recursive case, factorial, Fibonacci, sum of digits, recursion limit, memoization with lru_cache, recursion vs loops.
Python Scope
Learn Python variable scope: local vs global variables, the LEGB rule, the global and nonlocal keywords, closures, and the UnboundLocalError trap.
Python Lambda
Learn Python lambda functions: syntax, when to use them, and how they work with sorted(), map(), filter(), max() and min(), with runnable examples.
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