Attribute dtype inconsistency.ipynb

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   "cell_type": "code",
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   "metadata": {
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   "source": [
    "# git clone https://github.com/openPMD/openPMD-example-datasets.git\n",
    "# cd openPMD-example-datasets\n",
    "# tar -xf example-2d.tar.gz\n",
    "# tar -xf example-3d.tar.gz\n",
    "# tar -xf example-thetaMode.tar.gz"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": [
    "import numpy as np\n",
    "import h5py as h5"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "False"
      ]
     },
     "execution_count": 3,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "f = h5.File('example-3d/hdf5/data00000100.h5')\n",
    "# see https://github.com/openPMD/openPMD-standard/blob/latest/STANDARD.md#required-attributes-for-the-basepath\n",
    "f[\"/data/100\"].attrs[\"dt\"].dtype is np.float32"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "False"
      ]
     },
     "execution_count": 4,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "f = h5.File('example-2d/hdf5/data00000255.h5')\n",
    "f[\"/data/255\"].attrs[\"dt\"].dtype is np.float32"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "False"
      ]
     },
     "execution_count": 5,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "f = h5.File('example-thetaMode/hdf5/data00000100.h5')\n",
    "f[\"/data/100\"].attrs[\"dt\"].dtype is np.float32"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": [
    "f.close()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "metadata": {
    "collapsed": true
   },
   "outputs": [
    {
     "data": {
      "text/plain": [
       "\"\\nNon-standard attribute datatype for 'dt' (should be float, is double)\\nNon-standard attribute datatype for 'time' (should be float, is double)\\nNon-standard attribute datatype for 'gridSpacing' (should be float, is double)\\nNon-standard attribute datatype for 'position' (should be vector of float, is vector of double)\\nNon-standard attribute datatype for 'position' (should be vector of float, is vector of double)\\nNon-standard attribute datatype for 'position' (should be vector of float, is vector of double)\\nNon-standard attribute datatype for 'timeOffset' (should be float, is double)\\nNon-standard attribute datatype for 'gridSpacing' (should be float, is double)\\nNon-standard attribute datatype for 'position' (should be vector of float, is vector of double)\\nNon-standard attribute datatype for 'timeOffset' (should be float, is double)\\nNon-standard attribute datatype for 'timeOffset' (should be float, is double)\\nNon-standard attribute datatype for 'timeOffset' (should be float, is double)\\nNon-standard attribute datatype for 'timeOffset' (should be float, is double)\\nNon-standard attribute datatype for 'timeOffset' (should be float, is double)\\nNon-standard attribute datatype for 'timeOffset' (should be float, is double)\\nNon-standard attribute datatype for 'timeOffset' (should be float, is double)\\nNon-standard attribute datatype for 'dt' (should be float, is double)\\nNon-standard attribute datatype for 'time' (should be float, is double)\\nNon-standard attribute datatype for 'gridSpacing' (should be float, is double)\\nNon-standard attribute datatype for 'position' (should be vector of float, is vector of double)\\nNon-standard attribute datatype for 'position' (should be vector of float, is vector of double)\\nNon-standard attribute datatype for 'position' (should be vector of float, is vector of double)\\nNon-standard attribute datatype for 'timeOffset' (should be float, is double)\\nNon-standard attribute datatype for 'gridSpacing' (should be float, is double)\\nNon-standard attribute datatype for 'position' (should be vector of float, is vector of double)\\nNon-standard attribute datatype for 'timeOffset' (should be float, is double)\\nNon-standard attribute datatype for 'timeOffset' (should be float, is double)\\nNon-standard attribute datatype for 'timeOffset' (should be float, is double)\\nNon-standard attribute datatype for 'timeOffset' (should be float, is double)\\nNon-standard attribute datatype for 'timeOffset' (should be float, is double)\\nNon-standard attribute datatype for 'timeOffset' (should be float, is double)\\nNon-standard attribute datatype for 'timeOffset' (should be float, is double)\\n\""
      ]
     },
     "execution_count": 7,
     "metadata": {},
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   ],
   "source": [
    "'''\n",
    "Non-standard attribute datatype for 'dt' (should be float, is double)\n",
    "Non-standard attribute datatype for 'time' (should be float, is double)\n",
    "Non-standard attribute datatype for 'gridSpacing' (should be float, is double)\n",
    "Non-standard attribute datatype for 'position' (should be vector of float, is vector of double)\n",
    "Non-standard attribute datatype for 'position' (should be vector of float, is vector of double)\n",
    "Non-standard attribute datatype for 'position' (should be vector of float, is vector of double)\n",
    "Non-standard attribute datatype for 'timeOffset' (should be float, is double)\n",
    "Non-standard attribute datatype for 'gridSpacing' (should be float, is double)\n",
    "Non-standard attribute datatype for 'position' (should be vector of float, is vector of double)\n",
    "Non-standard attribute datatype for 'timeOffset' (should be float, is double)\n",
    "Non-standard attribute datatype for 'timeOffset' (should be float, is double)\n",
    "Non-standard attribute datatype for 'timeOffset' (should be float, is double)\n",
    "Non-standard attribute datatype for 'timeOffset' (should be float, is double)\n",
    "Non-standard attribute datatype for 'timeOffset' (should be float, is double)\n",
    "Non-standard attribute datatype for 'timeOffset' (should be float, is double)\n",
    "Non-standard attribute datatype for 'timeOffset' (should be float, is double)\n",
    "Non-standard attribute datatype for 'dt' (should be float, is double)\n",
    "Non-standard attribute datatype for 'time' (should be float, is double)\n",
    "Non-standard attribute datatype for 'gridSpacing' (should be float, is double)\n",
    "Non-standard attribute datatype for 'position' (should be vector of float, is vector of double)\n",
    "Non-standard attribute datatype for 'position' (should be vector of float, is vector of double)\n",
    "Non-standard attribute datatype for 'position' (should be vector of float, is vector of double)\n",
    "Non-standard attribute datatype for 'timeOffset' (should be float, is double)\n",
    "Non-standard attribute datatype for 'gridSpacing' (should be float, is double)\n",
    "Non-standard attribute datatype for 'position' (should be vector of float, is vector of double)\n",
    "Non-standard attribute datatype for 'timeOffset' (should be float, is double)\n",
    "Non-standard attribute datatype for 'timeOffset' (should be float, is double)\n",
    "Non-standard attribute datatype for 'timeOffset' (should be float, is double)\n",
    "Non-standard attribute datatype for 'timeOffset' (should be float, is double)\n",
    "Non-standard attribute datatype for 'timeOffset' (should be float, is double)\n",
    "Non-standard attribute datatype for 'timeOffset' (should be float, is double)\n",
    "Non-standard attribute datatype for 'timeOffset' (should be float, is double)\n",
    "'''"
   ]
  }
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Turns out this is NOT an inconsistency.
https://github.com/openPMD/openPMD-standard/blob/latest/STANDARD.md#conventions-throughout-these-documents

The naming (float) without a closer specification is used if the implementor can choose which kind of floating point precision shall be used.