title: Google BigQuery API using Python client
body: <p>I am trying to use the BigQuery Python API  ,
  but upon the following command:</p>
  
  <p><code>client = bigquery.Client()</code></p>
  
  <p>I am getting an error that the file that stores the service account key can’t be found.</p>
  
  <blockquote>
    <p>google.auth.exceptions.DefaultCredentialsError: File
    "C:\Projects\Agent Scoring-a5bf49c5af93.json" was not found.</p>
  </blockquote>
  
  <p>I followed the instruction here 
  <a href="https://cloud.google.com/bigquery/docs/quickstarts/quickstart-client-libraries" rel="nofollow noreferrer">https://cloud.google.com/bigquery/docs/quickstarts/quickstart-client-libraries</a></p>
  
  <p>The error message is not clear if the path to the file is known, how come it can’t be found.</p>
  
  <p>I am using Windows 10.</p>