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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 plugins():
 """Returns a tuple of the plugin classes registered with the python style checker. :rtype: tuple of :class:`pants.contrib.python.checks.checker.common.CheckstylePlugin` subtypes """

  return (
    ClassFactoring,
    ConstantLogic,
    ExceptStatements,
    FutureCompatibility,
    ImportOrder,
    Indentation,
    MissingContextManager,
    NewStyleClasses,
    Newlines,
    PrintStatements,
    TrailingWhitespace,
    PEP8VariableNames,
    PyflakesChecker,
    PyCodeStyleChecker,
  )