title: concatenate all strings in the dataframe column
body: <p>I want to convert all the strings in a dataframe column as a single empty string and then convert it in to list of words:</p>
  
  <pre><code>import pandas as pd
  df = pd.DataFrame({'read': ["Red", "is", "my", "favorite", "color"]})
  print(df)
      read
  0   Red
  1   is
  2   my
  3   favorite
  4   color
  </code></pre>
  
  <p>I tried to join strings but I don't know how to add space.</p>
  
  <pre><code>string = ""
  for i,j in df.iterrows():
      string += j["read"]
  </code></pre>
  
  <p>Output:</p>
  
  <pre><code>'Redismyfavoritecolor' 
  </code></pre>
  
  <p>Required Output:</p>
  
  <pre><code>"Red is my favorite color"
  </code></pre>