Widget for Julia's https://github.com/jukent/Misc_tools/blob/master/assign_scales.py

scales.ipynb

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 "cells": [
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {},
   "outputs": [],
   "source": [
    "import ipywidgets as widgets\n",
    "from ipywidgets import interact, interactive, fixed, interact_manual\n",
    "from IPython.display import display"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {},
   "outputs": [],
   "source": [
    "import numpy as np\n",
    "import random\n",
    "\n",
    "def assign_scales(number_of_scales, modality):\n",
    "    \"\"\"\n",
    "    number_of_scales: defines how many scales will be listed\n",
    "    \n",
    "    modality: must enter key from list [0: 'Major', 1: 'Natural Minor', \n",
    "    2: 'Harmonic Minor', 3: 'Melodic Minor', 4: 'All Modalities']\n",
    "    \"\"\"\n",
    "    tonic = ['C#', 'F#', 'B', 'E', 'A', 'G', 'C', 'F', 'B♭', 'E♭', 'A♭', \\\n",
    "             'D♭', 'G♭', 'C♭']\n",
    "    modes = [' Major', ' Natural Minor', ' Harmonic Minor', ' Melodic Minor']\n",
    "\n",
    "    assert any(np.arange(0,len(modes)+1) == modality), \\\n",
    "           'Input modality must be a number from 0 to ' + str(len(modes)) + \\\n",
    "           '. See documentation for key assignment'\n",
    "        \n",
    "    possible_scales = np.ravel([[t + modes[m] for t in tonic] for m in \\\n",
    "                                  np.arange(0,len(modes))]) if modality == 4 \\\n",
    "                                  else [t + modes[modality] for t in tonic]\n",
    "    \n",
    "    try:\n",
    "        scale_indices  = random.sample(range(0,len(possible_scales)),number_of_scales)\n",
    "        [print(possible_scales[i]) for i in scale_indices]\n",
    "    except ValueError:\n",
    "        print('Requested number of scales exceeded number of potential scales.')\n",
    "    "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {},
   "outputs": [],
   "source": [
    "w = interactive(assign_scales,\n",
    "          number_of_scales=widgets.IntSlider(min=1, max=20, step=1, value=1), \n",
    "          modality=widgets.IntSlider(min=0, max=4, step=1, value=0))"
   ]
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      "text/plain": [
       "interactive(children=(IntSlider(value=1, description='number_of_scales', max=20, min=1), IntSlider(value=0, de…"
      ]
     },
     "metadata": {},
     "output_type": "display_data"
    }
   ],
   "source": [
    "display(w)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  }
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