title: Python Pandas: TypeError: unsupported operand type(s) for +: 'datetime.time' and 'Timedelta'
body: <p>I am attempting to add two series in a dataframe in pandas with the first series being a 24-hr time value (e.g. 17:30) exported from an excel file and the second series being a series of the same length in Timedelta format converted from floats with the 'pd.Timedelta' command.  </p>
  
  <p>The desired resulting third column would be a 24-hr time regardless of day change (e.g. 22:00 + 4 hours = 02:00).</p>
  
  <p>I created the Delta series like this:</p>
  
  <pre><code>delta = pd.Series(0 for x in range(0, len(df.Time_In_Hours)))
  
  for j in range(0, len(df.Time_In_Hours)):
      delta[j] = pd.Timedelta(df.Time_In_Hours[j], 'h')
  df = df.assign(Delta = delta)   
  print ("Delta dtype = %s" % (df.Delta.dtype))
  print ("Start_Time dtype = %s" % (df.Start_Time.dtype))
  
  #Output
  Delta dtype = object
  Start_Time dtype = object
  </code></pre>
  
  <p>My goal is:</p>
  
  <pre><code>df["end_Time"] = df["Start_Time"] + df["Delta"]  
  </code></pre>
  
  <p>The error I am receiving is:
  <strong>TypeError: unsupported operand type(s) for +: 'datetime.time' and 'Timedelta'</strong></p>
  
  <p>It seems this datetime.time format is immutable.  Am I missing something?</p>