title: Convert data types of a Pandas dataframe to match another
body: <p>I have two data frames with the same column names but different data types:</p>
  
  <p><code>df1.dtypes</code></p>
  
  <pre><code>order                                                                                                             
  int64
  x                                                                                                                                
  int64
  y                                                                                                                     
  int64
  </code></pre>
  
  <p><code>df2.dtypes</code></p>
  
  <pre><code>order                                                                                                            
  object
  x                                                                                                                    
  object
  y                                                                                                                    
  object
  </code></pre>
  
  <p>The dataframes are much larger than this, so I would like to capture the names/dtypes of df1 and convert df2 to match.</p>