title: Initialize Vaex Dataframe Column to a value
body: <p>I want to initialize a column of my vaex dataframe to the int value 0</p>
  
  <p>I have the following:</p>
  
  <pre><code>right_csv = "animal_data.csv"
  
  vaex_df = vaex.open(right_csv,dtype='object',convert=True)
  
  vaex_df["initial_color"] = 0
  </code></pre>
  
  <p>But this will throw an error for line 3 complaining about how vaex was expecting a str Expression and got an integer instead. <br>
  How do I make a vaex expression set every row of a column to a single value?</p>