title: Why got an unexpected keyword argument 'num_workers' with TypeError: __init__()?
body: <pre><code>from nornir import InitNornir
  from nornir_napalm.plugins.tasks import napalm_get
  from nornir_utils.plugins.functions import print_result
  import json
  
  def prettyPrintDictionary(dict):
    print(json.dumps(dict, indent=2))
  
  
  nr = InitNornir(config_file=&quot;/home/python/nornir-scripts/config.yaml&quot;)
  
  print(nr.inventory.hosts)
  
  
  prettyPrintDictionary(nr.inventory.get_hosts_dict())
  </code></pre>
  <pre><code># config.yaml
  inventory:
    plugin: SimpleInventory
    options:
      host_file: '/home/python/nornir-scripts/inventory/hosts.yaml'
      group_file: '/home/python/nornir-scripts/inventory/groups.yaml'
      defaults_file: '/home/python/nornir-scripts/inventory/defaults.yaml'
  runner:
     plugin: threaded
     options:
       num_workers: 100
  </code></pre>
  <p>Help please I cant understand how to initialize nornir
  I try to do it with guide and it also have mistakes.
  Now I have this mistake...</p>