old_contents: 
  
  
  
  class SpectrumError(Exception):
      """A Base class error
  
      """
      #def __init__(self, value=None):
      #    self.value = value
      def __str__(self):
          return "Unknown Spectrum Error:"
  
  
  class SpectrumModifiedError(SpectrumError):
      def __str__(self):
          msg = """Data has been modified (or NFFT, or sampling, or N) but
              the PSD has not be (re)-computed. Call it using () syntax (.e.g. p =
  parma(...); p() )"""
          return msg
  
  
  class SpectrumChoiceError(SpectrumError):
      def __init__(self, value, valid):
          #super(SpectrumChoiceError, self).__init__()
          self.value = value
          self.valid = valid
      def __str__(self):
          msg = """Spectrum error: invalid choice (%s). Possible values are %s.""" %\
              (self.value, self.valid)
          return msg
  
  
  class SpectrumPSDError(SpectrumError):
      def __str__(self):
          msg = """PSD not computed. Populate the attribute psd."""
          return msg
  
  
  class SpectrumARMAError(SpectrumError):
      def __str__(self):
          msg = """Either AR parameter and/or MA must be provided"""
          return msg
  
  
  class SpectrumARError(SpectrumError):
      def __str__(self):
          msg = """AR order must be stricly positive"""
          return msg
  
  
  class SpectrumMAError(SpectrumError):
      def __str__(self):
          msg = """AR order must be stricly positive"""
          return msg
  
  
  class SpectrumOrder(SpectrumError):
      def __str__(self):
          msg = """AR or MA order must be stricly positive"""
          return msg
  
  
  class SpectrumNFFT(SpectrumError):
      def __str__(self):
          msg = """NFFT must be stricly positive"""
          return msg
  
  
  def is_positive_integer(order, name="wrong argument. "):
      if order < 0:
          raise SpectrumOrder
      if type(order) != int:
          raise TypeError("%s must be an integer" % name)
      return True
  
new_contents: 
  
  
  
  class SpectrumError(Exception):
      """A Base class error
  
      """
      #def __init__(self, value=None):
      #    self.value = value
      def __str__(self):
          return "Unknown Spectrum Error:"
  
  
  class SpectrumModifiedError(SpectrumError):
      def __str__(self):
          msg = """Data has been modified (or NFFT, or sampling, or N) but
              the PSD has not be (re)-computed. Call it using () syntax (.e.g. p =
  parma(...); p() )"""
          return msg
  
  
  class SpectrumChoiceError(SpectrumError):
      def __init__(self, value, valid):
          #super(SpectrumChoiceError, self).__init__()
          self.value = value
          self.valid = valid
      def __str__(self):
          msg = """Spectrum error: invalid choice (%s). Possible values are %s.""" %\
              (self.value, self.valid)
          return msg
  
  
  class SpectrumPSDError(SpectrumError):
      def __str__(self):
          msg = """PSD not computed. Populate the attribute psd."""
          return msg
  
  
  class SpectrumARMAError(SpectrumError):
      def __str__(self):
          msg = """Either AR parameter and/or MA must be provided"""
          return msg
  
  
  class SpectrumARError(SpectrumError):
      def __str__(self):
          msg = """AR order must be stricly positive"""
          return msg
  
  
  class SpectrumMAError(SpectrumError):
      def __str__(self):
          msg = """MA order must be stricly positive"""
          return msg
  
  
  class SpectrumOrder(SpectrumError):
      def __str__(self):
          msg = """AR or MA order must be stricly positive"""
          return msg
  
  
  class SpectrumNFFT(SpectrumError):
      def __str__(self):
          msg = """NFFT must be stricly positive"""
          return msg
  
  
  def is_positive_integer(order, name="wrong argument. "):
      if order < 0:
          raise SpectrumOrder
      if type(order) != int:
          raise TypeError("%s must be an integer" % name)
      return True
  
subject: Fix typo