A pair programming rotation for five people

PairingRotation.ipynb

{
 "cells": [
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# Pairing Rotation"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "How to get all pairings from a list?\n",
    "\n",
    "It's important that no two pairings be repeated, and that everyone be paired with everyone else."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {},
   "outputs": [],
   "source": [
    "from itertools import permutations"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {},
   "outputs": [],
   "source": [
    "people = ['Daniel', 'Hiromi', 'Andrew', 'Peter', 'Patrick'] #, 'Nobody']"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {},
   "outputs": [],
   "source": [
    "perms = list(permutations(people))\n",
    "# perms"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {},
   "outputs": [],
   "source": [
    "n = 2\n",
    "idxs = [i for i in range(0,len(people),n)]\n",
    "# idxs"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "metadata": {},
   "outputs": [],
   "source": [
    "pairings = [ tuple(sorted([tuple(sorted(p[i:i+n])) for i in idxs])) for p in perms]\n",
    "# pairings"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "metadata": {},
   "outputs": [
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     "data": {
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       "120"
      ]
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     "execution_count": 6,
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     "output_type": "execute_result"
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   "source": [
    "len(pairings)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "metadata": {},
   "outputs": [],
   "source": [
    "unique_pairings = set(pairings)\n",
    "# unique_pairings"
   ]
  },
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   "cell_type": "code",
   "execution_count": 8,
   "metadata": {},
   "outputs": [
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      "text/plain": [
       "15"
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     "execution_count": 8,
     "metadata": {},
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   "source": [
    "len(unique_pairings)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 9,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "[[('Andrew', 'Patrick'), ('Daniel', 'Peter'), ('Hiromi',)],\n",
       " [('Andrew', 'Daniel'), ('Patrick', 'Peter'), ('Hiromi',)],\n",
       " [('Andrew', 'Patrick'), ('Daniel', 'Hiromi'), ('Peter',)],\n",
       " [('Andrew', 'Daniel'), ('Hiromi', 'Peter'), ('Patrick',)],\n",
       " [('Andrew', 'Hiromi'), ('Daniel', 'Patrick'), ('Peter',)],\n",
       " [('Daniel', 'Peter'), ('Hiromi', 'Patrick'), ('Andrew',)],\n",
       " [('Andrew', 'Peter'), ('Hiromi', 'Patrick'), ('Daniel',)],\n",
       " [('Andrew', 'Hiromi'), ('Patrick', 'Peter'), ('Daniel',)],\n",
       " [('Daniel', 'Hiromi'), ('Patrick', 'Peter'), ('Andrew',)],\n",
       " [('Daniel', 'Patrick'), ('Hiromi', 'Peter'), ('Andrew',)],\n",
       " [('Andrew', 'Patrick'), ('Hiromi', 'Peter'), ('Daniel',)],\n",
       " [('Andrew', 'Peter'), ('Daniel', 'Patrick'), ('Hiromi',)],\n",
       " [('Andrew', 'Hiromi'), ('Daniel', 'Peter'), ('Patrick',)],\n",
       " [('Andrew', 'Peter'), ('Daniel', 'Hiromi'), ('Patrick',)],\n",
       " [('Andrew', 'Daniel'), ('Hiromi', 'Patrick'), ('Peter',)]]"
      ]
     },
     "execution_count": 9,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "[sorted(pairing,reverse=True,key=lambda s:len(s)) for pairing in unique_pairings]"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  }
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