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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _GetImportTimestamps(self, pefile_object):
 """Retrieves timestamps from the import directory, if available. Args: pefile_object (pefile.PE):
 pefile object. Returns: list[int]: import timestamps. """

    import_timestamps = []
    if not hasattr(pefile_object, 'DIRECTORY_ENTRY_IMPORT'):
      return import_timestamps
    for importdata in pefile_object.DIRECTORY_ENTRY_IMPORT:
      dll_name = getattr(importdata, 'dll', '')
      try:
        dll_name = dll_name.decode('ascii')
      except UnicodeDecodeError:
        dll_name = dll_name.decode('ascii', errors='replace')
      if not dll_name:
        dll_name = '<NO DLL NAME>'

      timestamp = getattr(importdata.struct, 'TimeDateStamp', 0)
      if timestamp:
        import_timestamps.append([dll_name, timestamp])
    return import_timestamps