old_contents: import base64
  import re
  import numpy as np
  import inspect
  
  TIMEDELTA_DTYPE_RE = re.compile(r'\[(?P<dtype>[^\]]+)\]')
  
  
  def encode_timedelta(td):
      print(td)
      dtype = TIMEDELTA_DTYPE_RE.search(str(td.dtype)).groupdict()['dtype']
      # base64 encoded value, encoded as a utf-8
      encoded = base64.b64encode(td.astype(np.uint64).tostring()).decode()
      return encoded, dtype
  
  
  def decode_timedelta(t):
      try:
          v = np.frombuffer(base64.b64decode(t[0]), dtype=np.uint64)[0]
          s = t[1]
          return np.timedelta64(int(v), s)
      except IndexError:
          return t
  
  
  def extract_init_args(instance):
      """
      Given an instance, and under the assumption that member variables have the
      same name as the __init__ arguments, extract the arguments so they can
      be used to reconstruct the instance when deserializing
      """
      cls = instance.__class__
      args = [x for x in inspect.getargspec(cls.__init__).args if x != 'self']
      return [instance.__dict__[key] for key in args]
  
new_contents: import base64
  import re
  import numpy as np
  import inspect
  
  TIMEDELTA_DTYPE_RE = re.compile(r'\[(?P<dtype>[^\]]+)\]')
  
  
  def encode_timedelta(td):
      dtype = TIMEDELTA_DTYPE_RE.search(str(td.dtype)).groupdict()['dtype']
      # base64 encoded value, encoded as a utf-8
      encoded = base64.b64encode(td.astype(np.uint64).tostring()).decode()
      return encoded, dtype
  
  
  def decode_timedelta(t):
      try:
          v = np.frombuffer(base64.b64decode(t[0]), dtype=np.uint64)[0]
          s = t[1]
          return np.timedelta64(int(v), s)
      except IndexError:
          return t
  
  
  def extract_init_args(instance):
      """
      Given an instance, and under the assumption that member variables have the
      same name as the __init__ arguments, extract the arguments so they can
      be used to reconstruct the instance when deserializing
      """
      cls = instance.__class__
      args = [x for x in inspect.getargspec(cls.__init__).args if x != 'self']
      return [instance.__dict__[key] for key in args]
  
subject: Remove debug statement