title: append dictionary to data frame
body: <p>I have a function, which returns a dictionary like this:</p>
  
  <pre><code>{'truth': 185.179993, 'day1': 197.22307753038834, 'day2': 197.26118010160317, 'day3': 197.19846975345905, 'day4': 197.1490578795196, 'day5': 197.37179265011116}
  </code></pre>
  
  <p>I am trying to append this dictionary to a dataframe like so:</p>
  
  <pre><code>output = pd.DataFrame()
  output.append(dictionary, ignore_index=True)
  print(output.head())
  </code></pre>
  
  <p>Unfortunately, the printing of the dataframe results in an empty dataframe. Any ideas?</p>