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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_source(self):
 """Load the source for the specified file."""

    if self.filename in self.STDIN_NAMES:
      self.filename = 'stdin'
      self.source = pycodestyle.stdin_get_value()
    else:
      with pep257.tokenize_open(self.filename) as fd:
        self.source = fd.read()