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@samueltardieu
samueltardieu / pell.py
Created November 26, 2010 22:47
Solve the Pell equation
"""Compute solutions to the diophantine Pell equation x^2-D*y^2=1."""
import itertools
def pell (D):
"""Return the smallest integer set solving Pell equation
x^2-D*y^2=1 where x, D and y are positive integers. If there are no
solution (D is a square), return None.
>>> pell(3)
@Jach
Jach / number_hack.py
Created September 10, 2011 11:44
Overrides the Python integer five to be equal to four with ctypes magic
import sys
import ctypes
pyint_p = ctypes.POINTER(ctypes.c_byte*sys.getsizeof(5))
five = ctypes.cast(id(5), pyint_p)
print(2 + 2 == 5) # False
five.contents[five.contents[:].index(5)] = 4
print(2 + 2 == 5) # True (must be sufficiently large values of 2 there...)
@gatlin
gatlin / sat.hs
Created February 6, 2012 23:05
SAT Solver in Haskell
-- This is going to be on Hackage soon! https://github.com/gatlin/surely
{-# LANGUAGE BangPatterns #-}
-- |
-- Module : AI.Surely
-- Copyright : 2012 Gatlin Johnson
-- License : LGPL 3.0
-- Maintainer : rokenrol@gmail.com
-- Stability : experimental
@beala
beala / argy.py
Created August 11, 2012 15:48
A command line argument parser using generators and co-routines.
"""
Inspired by:
http://eli.thegreenplace.net/2009/08/29/co-routines-as-an-alternative-to-state-machines/
"""
def parse_args(target):
"""A generator that parses a stream of arguments one character at a time.
As soon as a flag, or flag value pair ("-a" or "-a value") is processed
the pair is sent off as a tuple to the 'target' generator.
@Nurdok
Nurdok / python_conversion.md
Last active December 16, 2022 03:45
Python Conversion

Python Number Conversion Chart

From To Expression

Twitter公式クライアントのコンシューマキー

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@leoleozhu
leoleozhu / git with proxy.md
Last active December 21, 2016 15:48
use Git with proxy

install socat

sudo apt-get install socat

edit ~/.ssh/config

host github.com
    proxycommand socat - PROXY:localhost:%h:%p,proxyport=8080

###If you want to use SOCKS proxy, edit it like this. host bitbucket.org ProxyCommand socat - SOCKS:localhost:%h:%p,socksport=7070

@tungel
tungel / my Arch Linux cheat-sheet
Created July 8, 2013 13:42
I have kind of short term memory so I like to take note of what I've done. This cheat-sheet log some of the things I've done to my Arch Linux machine. Lots of these stuffs are based on my personal preference and may not be applicable to you. Also take note that: I'm not responsible if you break your machine by following any of the steps in this …
Installing Arch:
sudo vim /etc/pacman.conf
Update packages list: sudo pacman -Syy
run sudo pacman -Syu before installing any software (to update the repositories first)
* Timing issue:
- Change hardware clock to use UTC time:
sudo timedatectl set-local-rtc 0

The Borrow Checker

This pass has the job of enforcing memory safety. This is a subtle topic. This docs aim to explain both the practice and the theory behind the borrow checker. They start with a high-level overview of how it works, and then proceed to dive into the theoretical background. Finally, they go into detail on some of the more subtle aspects.

Table of contents

@evansb
evansb / Parser.hs
Created August 11, 2014 11:28
3 lines Parser in Haskell (Line 9,11,12)
import Control.Monad.State.Lazy
import Control.Monad.Error
import Control.Monad.Identity
import Control.Applicative
import Data.Char
-- Begin parser
type Parser a = StateT String (ErrorT String Identity) a