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\documentclass[$if(fontsize)$$fontsize$,$endif$$if(lang)$$lang$,$endif$$if(papersize)$$papersize$,$endif$]{$documentclass$}
\usepackage[T1]{fontenc}
\usepackage{lmodern}
\usepackage{amssymb,amsmath}
\usepackage{euler}
\usepackage{ifxetex,ifluatex}
\usepackage{fixltx2e} % provides \textsubscript
% use microtype if available
\ifnum 0\ifxetex 1\fi\ifluatex 1\fi=0 % if pdftex
  \IfFileExists{microtype.sty}{\usepackage{microtype}}{}

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Arg Name or Optional Flags:
	positional	: str		= "foo"
	options		: str		= "-f", "--foo"

Standard:
	action		: str		= [store], append, store_true, store_false, store_const, append_const, version
	default		: *			= [None]
	type		: callable	= [str], argparse.FileType(mode='wb', bufsize=0)

Exotic:

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IF(${CMAKE_SYSTEM_PROCESSOR} MATCHES "x86_64") # for desktop
  message("1")
ELSE(${CMAKE_SYSTEM_PROCESSOR} MATCHES "aarch64") # for tx2
  message("2")
ELSE()
  message(FATAL_ERROR "Unknown System Architecture: ${CMAKE_SYSTEM_PROCESSOR}")
ENDIF()

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// A simple quickref for Eigen. Add anything that's missing.
// Main author: Keir Mierle

#include <Eigen/Dense>

Matrix<double, 3, 3> A;               // Fixed rows and cols. Same as Matrix3d.
Matrix<double, 3, Dynamic> B;         // Fixed rows, dynamic cols.
Matrix<double, Dynamic, Dynamic> C;   // Full dynamic. Same as MatrixXd.
Matrix<double, 3, 3, RowMajor> E;     // Row major; default is column-major.
Matrix3f P, Q, R;                     // 3x3 float matrix.

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# !pip install PyGeometry
from geometry import *
import numpy as np

def quaternion_multiply(p, q):
    assert isinstance(p, np.ndarray) and p.shape == (4,)
    assert isinstance(q, np.ndarray) and q.shape == (4,)
    p0, p1, p2, p3, q0, q1, q2, q3 = p[0], p[1], p[2], p[3], q[0], q[1], q[2], q[3]
    r0 = + p0 * q0 - p1 * q1 - p2 * q2 - p3 * q3
    r1 = + p0 * q1 + p1 * q0 + p2 * q3 - p3 * q2

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Bing image scraper example using Python to query and scrape Microsoft Bing image search.

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#!/bin/bash

# An easy script to record GIF based on [ffcast](https://github.com/lolilolicon/FFcast).
# With default options, you draw a region to start recording, press 'q' to stop, and a `screenshot.gif` file will be saved to current directory. 
# Read the [WIKI](https://github.com/lolilolicon/FFcast/wiki/GIF-Howto) and this script to learn more details.
# Author of this script: huangyuyao@outlook.com

STEP1=YES
STEP2=YES
FPS=10

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#!/usr/bin/python3    
"""    
remove latest file/subfolder in the given folder.
Author: huangyuyao@outlook.com
"""    
    
import sys    
import os    
import time    
import sys    

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python3 -m pip install --extra-index-url https://rospypi.github.io/simple/ rospy rosbag sensor_msgs --user

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import os
import hashlib

def escape(s):
    allowed = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVQXYZ0123456789_'
    s = ''.join(i for i in s if i in allowed)
    return s

def make_cache(value_creator, cache_name, cache_dir='__pycache__/'):
    cache_name = escape(cache_name)