TIL

Today I Learned

A collection of links and concise write-ups on small things I learn day to day across a variety of languages and technologies.

Day 1

• What do programmers actually do?
• Front end vs Back end | Blonde Dictionary explanation
• What is Git and Github? Source Control —Coding For Beginners
• How to create a repository on github

Day 2

Official python tutorial

• Variables, loops for and while, if, functions, list, tuple, sipmle string manipulations etc. (1-13)
• Enumerate, if in
• git rebase --interactive
• git status | git log --decorate --oneline --graph <3

Day 3

• Import, file, exceptions (14-17)

Day 4

• Class, self in class, magical methods, own exceptions (18-22)
• More about magical methods
• 'never' git add . | git add -p <3

Day 5

• git (config, tools)
• 5-sposobow-na-prace-z-gitem
• 10 Sekretnych Komend Gita, O Których Nie Masz Pojęcia

Day 6

• git (tags, alias)
  • git tag annotated > lightweight(temp/auto)
  • ~..^ (tag/commit navigation)
• Own autocomplete //swap to alias soon

Day 7

• Python testing
• Virtualenvwrapper - must have with packages

Day 8

• Unit Testing vs Integration Testing
• Mocking in python
• Still mocking in python
• Asserations test - unittest

Day 9

• git (merge, branch)
  • merge
  • cherry-picking for move commit
  • no-ff in merge for no fast forward (flat merge)
  • git init --bare (create repo for share code)

Day 10

• git
  • pull = fetch + merge (better fetch and manual)
  • git diff --cached (diffrence added to staged area)

Day 11

• git
  • git checkout -- file (return file from last commit) or gut checkout commit -- file (we can use *.html - all files .html)
  • git reset --hard (reset modify from disc too) without reset only back commit whithout modify files (example: git reset @^)
  • git clean (for remove files) -n (test - only show) -i (interactive) -f (force - real delete) -x (delete file from gitignore) - fd(files and folders)
  • git stash - 'hidden' commit (git stash list - list) (git stash pop - last stash back to working copy) use only with save and own tekst
  • .gitignore (name/ ignore folder name) (we can use pattern like *.txt, [bB]in/ (bin and Bin)
    • .git/info/exlude - private .gitignore
    • git check-ignore
    • git update-index --asume-unchanged file (ignore for tracked files) --no-asume-unchanged for back
    • git ls-files -v (list files + status, 'h' for asume-unchanged)
      • git ls-files -v | grep "^[[:lower:]]" list only asume-unchanged files
    • git config include.path file_dir (include own configuration)
      • includeif.statment example: git config --global includeif.gitdir:C:/dev/work .path .gitfile (add .gitfile to global config only to repos in C:/dev/work)

Day 12

• git
  • git reset --hard ORIG_HEAD - return before merge/rebase
  • git fetch --prune --prune-tags
• VIM

Day 13

• git
  • git rerere - merge helper (memory our chose)
  • git revert - revert changes
  • git commit --amend - edit last commit
  • git rebase - lineary history -i for interactive mode
  • filter-branch - tools for rewrite history
  • git remote update --prune - update branch (in someone delete branch, this command delete local too)
  • git blame / git gui blame - last editor (line)
  • git log -S txt -p - find txt in commit (but not in title) -S is pickaxe
  • --format=%h | clip - good help to easy copy commit (for pickaxe)
  • git bisect - bug catcher

Day 14

• git
  • gitsubmodules
  • gitslave
  • subtrea (the best? for submodules still better package management)

Day 15

• python
  • Generators
  • List Comprehensions
  • Regular Expressions
    • more
  • Multiple Function Arguments

Day 16

• Python
  • Global, Local and Nonlocal variables
  • else with while, for
• Kite

Day 17

• Python
  • Numbers - Fractions
  • Set - 'While using discard() if the item does not exist in the set, it remains unchanged. But remove() will raise an error in such condition.'

Day 18

• Python
  • OOP in Python - Inheritance, Encapsulation, Polymorphism
    • More about inheritance
      • Method Resolution Order (MRO) - 'In the multiple inheritance scenario, any specified attribute is searched first in the current class. If not found, the search continues into parent classes in depth-first, left-right fashion without searching same class twice.'
  • Operator overloading

Day 19

• Python
  • Class iterator
  • Closure
  • Decorators

Day 20

• Python
  • @property
  • Deep copy
  • Asseration

Day 21

• Django
  • Introduction
  • Install

Day 22

• Django
  • Tutorial 1-3

Day 23

• Java

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Day 25

• Docker - install
  • Docker run without sudo
  • Basic tutorial (1-2)

Day 26

• Remember the three-step guide to making model changes:
  • Change your models (in models.py).
  • Run python manage.py makemigrations to create migrations for those changes
  • Run python manage.py migrate to apply those changes to the database.
• You should always return an HttpResponseRedirect after successfully dealing with POST data. This tip isn’t specific to Django; it’s just good Web development practice
• pip freeze - installed packages
• create requirments.txt with your installed packages like name=version
  • pip install -r requirements.txt

Day 27

• psycopg2 need to migrate db to postgres
  • if install error on virtualenv check
• For security, we can split django settings and docker-composer for normal and prod version.
• File .env is good places for system variables (and passwords). Add it to .gitignore.
• When u run docker-compose (containter with few docker-compose.yml) add them in command line, like: docker compose -f docker-compose.yml -f docker-compose.prod.yml
  • check them in the same way (prev command with ps on the end)
• See

Day 28

• "In django our working directory is always the folder that containts manage.py"
• f-strings > format() > % formating
• mkvirtualenv name - COMMAND FOR WRAPPER (WORKON) - PYTHON

ctrl+alt+o - pycharm sort imports