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   "cell_type": "markdown",
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   "source": [
    "# EnumerateInstances"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "<a href=\"#\" onclick=\"history.back()\">&lt;--- Back</a>"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "The [`EnumerateInstances()`](https://pywbem.readthedocs.io/en/latest/client.html#pywbem.WBEMConnection.EnumerateInstances) method returns a list of [`pywbem.CIMInstance`](https://pywbem.readthedocs.io/en/latest/client.html#pywbem.CIMInstance) objects for each CIM instance of a particular CIM class (and its subclasses). The CIM instance path is part of the returned instance objects and can be accessed via their `path` attribute.\n",
    "\n",
    "The following code enumerates the instances of the specified CIM class and prints their instance path in WBEM URI format (see  [`pywbem.CIMInstanceName.__str__()`](https://pywbem.readthedocs.io/en/latest/client.html#pywbem.CIMInstanceName.__str__)), and the instance itself in MOF format (see [`pywbem.CIMInstance.tomof()`](https://pywbem.readthedocs.io/en/latest/client.html#pywbem.CIMInstance.tomof))."
   ]
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  {
   "cell_type": "code",
   "execution_count": null,
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   "source": [
    "from __future__ import print_function\n",
    "import pywbem\n",
    "\n",
    "username = 'user'\n",
    "password = 'password'\n",
    "classname = 'CIM_ComputerSystem'\n",
    "namespace = 'root/cimv2'\n",
    "server = 'http://localhost'\n",
    "\n",
    "conn = pywbem.WBEMConnection(server, (username, password),\n",
    "                             default_namespace=namespace,\n",
    "                             no_verification=True)\n",
    "try:\n",
    "    insts = conn.EnumerateInstances(classname)\n",
    "except pywbem.Error as exc:\n",
    "    print('Operation failed: %s' % exc)\n",
    "else:\n",
    "    print('Retrieved %s instances' % (len(insts)))\n",
    "    for inst in insts:\n",
    "        print('path=%s' % inst.path)\n",
    "        print(inst.tomof())    "
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "In this example, the connection has a default namespace set. This allows us to omit the namespace from the subsequent [`EnumerateInstances()`](https://pywbem.readthedocs.io/en/latest/client.html#pywbem.WBEMConnection.EnumerateInstances) method.\n",
    "\n",
    "This example also shows exception handling with PyWBEM: PyWBEM wraps any exceptions that are considered runtime errors, and raises them as subclasses of [`pywbem.Error`](https://pywbem.readthedocs.io/en/latest/client.html#pywbem.Error). Any other exceptions are considered programming errors. Therefore, the code above only needs to catch [`pywbem.Error`](https://pywbem.readthedocs.io/en/latest/client.html#pywbem.Error).\n",
    "\n",
    "Note that the creation of the [`pywbem.WBEMConnection`](https://pywbem.readthedocs.io/en/latest/client.html#pywbem.WBEMConnection) object in the code above does not need to be protected by exception handling; its initialization code does not raise any PyWBEM runtime errors."
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "<a href=\"#\" onclick=\"history.back()\">&lt;--- Back</a>"
   ]
  }
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