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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 load_internal_cache(cls, pex, pex_info):
 """Possibly cache out the internal cache."""

    internal_cache = os.path.join(pex, pex_info.internal_cache)
    with TRACER.timed('Searching dependency cache: %s' % internal_cache, V=2):
      if os.path.isdir(pex):
        for dist in find_distributions(internal_cache):
          yield dist
      else:
        for dist in itertools.chain(*cls.write_zipped_internal_cache(pex, pex_info)):
          yield dist