Frequently used built-in modules.

• logging
  • tutorial (real python blog)
  • further readings (real python blog)

Containing some common data structure & algorithm implemented with built-in functionality/code/lib. Frequently used in leetcode practice.

• use iterator to save memory.

• itertools: permuation, combination, product. realpython blog

• formatting string with f-string.

• operators: call basic operators as functions.

• common data structures

  • list
  • collections.deque: queue, deque, stack
  • heapq: default is min heap
  • set: hash set
  • dict: hash map
  • union find, code example, time complexity note

• For parsing command line arguments, use arg_parser.py
• references:
  • argparse python doc
  • StackOverflow #1 StackOverflow #2
  • Use case
  • Medium blog post

My notes

• high-order function: a function that returns a function.
• decorator: a function that takes a function input, calls this function in an created inner(wrapper) function and returns the inner function, or directly return the function.
• When we want a decorator to receive arguments, we define it as a fuction that returns a decorator function.
• decorators could also be callble objects. This has similarity with React Components where we have function component and class component. python decorator could be a callable class, so it could store states.
• how we fix the definition: decorator: a functioncallable object that takes a function input, calls this function in an created inner function and returns the inner function, or directly return the function.

• references:
  • RealPython blog1, blog2
  • Common use cases: stackoverflow, some wiki

My templates for drawing plots with matplotlib.

RealPython blog python -m unittest discover -s tests

RealPython blog

things we should avoid.