Example of Chaining and Permutation/Crossproduct using list comprehension in Python

Chaining and Permutations.ipynb

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   "source": [
    "cars = [['Mustang', 'GT'],\n",
    "        ['Explorer', 'Expedition'], \n",
    "        ['F-150', 'Super Duty']]"
   ]
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   "cell_type": "code",
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   "source": [
    "# chaining example\n",
    "chaining = [car.upper()\n",
    "           for category in cars\n",
    "           for car in category]"
   ]
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     "text": [
      "['MUSTANG', 'GT', 'EXPLORER', 'EXPEDITION', 'F-150', 'SUPER DUTY']\n"
     ]
    }
   ],
   "source": [
    "print(chaining)"
   ]
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   "source": [
    "# permutation/crossproduct\n",
    "permutations = [(car, year)\n",
    "               for car in chaining\n",
    "               for year in range(2015, 2017)]"
   ]
  },
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   "cell_type": "code",
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     "text": [
      "[('MUSTANG', 2015), ('MUSTANG', 2016), ('GT', 2015), ('GT', 2016), ('EXPLORER', 2015), ('EXPLORER', 2016), ('EXPEDITION', 2015), ('EXPEDITION', 2016), ('F-150', 2015), ('F-150', 2016), ('SUPER DUTY', 2015), ('SUPER DUTY', 2016)]\n"
     ]
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   ],
   "source": [
    "print(permutations)"
   ]
  },
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   "cell_type": "code",
   "execution_count": 6,
   "metadata": {
    "collapsed": true
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   "outputs": [],
   "source": [
    "# ordering in permutation matters\n",
    "permutations2 = [(car, year)\n",
    "                for year in range(2015, 2017)\n",
    "                for car in chaining]"
   ]
  },
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   "cell_type": "code",
   "execution_count": 7,
   "metadata": {},
   "outputs": [
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     "name": "stdout",
     "output_type": "stream",
     "text": [
      "[('MUSTANG', 2015), ('GT', 2015), ('EXPLORER', 2015), ('EXPEDITION', 2015), ('F-150', 2015), ('SUPER DUTY', 2015), ('MUSTANG', 2016), ('GT', 2016), ('EXPLORER', 2016), ('EXPEDITION', 2016), ('F-150', 2016), ('SUPER DUTY', 2016)]\n"
     ]
    }
   ],
   "source": [
    "print(permutations2)"
   ]
  }
 ],
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