code: def __enter__(self):
      for src in self.__files:
          shutil.copy2(src, self.__dst)
          if os.path.isdir(self.__dst):
              self.__toRemove.append(
                  os.path.join(self.__dst, os.path.basename(src))
              )
          else:
              self.__toRemove.append(self.__dst)
  
imports: import csv
  import os
  import shutil
  import subprocess
  import tempfile
  import unittest
  import matplotlib
  from six.moves import xrange
  from pyalgotrade import dataseries
label_desc: Use image node_id 2 for calling the CopyFiles obj's underlying member method code with example usage: obj.__enter__() without return types