code: def get_file(self, filename):
          
          import linecache
          # Hack for frozen importlib bootstrap
          if filename == '<frozen importlib._bootstrap>':
              filename = os.path.join(
                  os.path.dirname(linecache.__file__), 'importlib',
                  '_bootstrap.py'
              )
          return to_unicode_string(
              ''.join(linecache.getlines(filename)), filename
          )
docs: Get file source from cache