title: how to replace NaN value in python
body: <p>I have a list of <code>NaN</code> values in my dataframe and I want to replace NaN values with an empty string.</p>
  
  <p>What I've tried so far, which isn't working:</p>
  
  <pre><code>df_conbid_N_1 = pd.read_csv("test-2019.csv",dtype=str, sep=';', encoding='utf-8')
  df_conbid_N_1['Excep_Test'] = df_conbid_N_1['Excep_Test'].replace("NaN","")
  </code></pre>