Appendix - Commands

Python

Python can be used within the Python prompt, prefixed with >>>, or via .py files.
Python is used to conduct computations.
Versus a calculator, it supports arithmetic, comparisons, code reuse, and repeated actions.

\[ f(x) = \begin{cases} 9x^2 + 5 & x < 4 \\ 9 & 4 \leq x \leq 8 \\ 2 - x & x > 8 \end{cases} \]

def f(x):
    if (x < 4):
        return 9 * x ** 2 + 5
    elif (4 <= x <= 8):
        return 9
    elif (x > 8):
        return 2 - x

result = []
for x in [-1, 4, 5, 8, 11]:
    result = result + [f(x)]
result

[14, 9, 9, 9, -9]

Use nvim to access a modal text editor.
In i or insert mode, is like other editors.
Outside i there’s “motions”, “operators”, “commands”
- “Motions” move the cursor - where you would type in i mode
- “Operators” manipulate text - add, delete, yank (copy), paste
- “Commands” load and save files and exit Neovim.

Motion	Movement
`h`	left one character
`j`	down one line
`k`	up one line
`l`	right one character
`0`	beginning of line
`$`	end of line
`/search_term`	go to next occurance of “search_term”
`e`	end of word
`b`	beginning of word

Operator	Action
`i`	insert text
`r`	replace character
`d`	delete text, combined with a motion
`y`	yank text, combined with a motion
`p`	paste yanked text

Bash commands are used folder-relative.
Bash is used within a terminal and is the default terminal environment.
To get bash running:
- Windows: Check Appendix - Git Bash
- MacOS: Spotlight menu -> “Terminal” (zsh, but close enough)
Mostly used to navigate the file system, organize files, launch programs like Python and Neovim