title: 'module' object has no attribute '_strptime' with several threads Python
body: <p>I'm getting this error <code>'module' object has no attribute '_strptime'</code> but only when I use several threads. When I only use one it works fine. Im using python 2.7 x64. Here there us the reduced function i'm calling</p>
  
  <pre><code>import datetime
  def get_month(time):
      return datetime.datetime.strptime(time, '%Y-%m-%dT%H:%M:%S+0000').strftime("%B").lower()
  </code></pre>
  
  <p>Here is the complete traceback:</p>
  
  <pre><code>AttributeError: 'module' object has no attribute '_strptime'
  
  Exception in thread Thread-22:
  Traceback (most recent call last):
    File "C:\Python27x64\lib\threading.py", line 810, in __bootstrap_inner
      self.run()
    File "C:\Python27x64\lib\threading.py", line 763, in run
      self.__target(*self.__args, **self.__kwargs)
    File "C:\file.py", line 81, in main
      month=get_month(eventtime)
    File "C:\file.py", line 62, in get_month
      return datetime.datetime.strptime(time, '%Y-%m-%dT%H:%M:%S+0000').strftime("%B").lower()
  AttributeError: 'module' object has no attribute '_strptime'
  </code></pre>