parameters: (self, func, default=None, testing_value=None,
                 missing_values=asbytes(''), locked=False)
docstring: Set StringConverter attributes directly.
  
          Parameters
          ----------
          func : function
              Conversion function.
          default : any, optional
              Value to return by default, that is, when the string to be converted
              is flagged as missing. If not given, `StringConverter` tries to supply
              a reasonable default value.
          testing_value : str, optional
              A string representing a standard input value of the converter.
              This string is used to help defining a reasonable default value.
          missing_values : sequence of str, optional
              Sequence of strings indicating a missing value.
          locked : bool, optional
              Whether the StringConverter should be locked to prevent automatic
              upgrade or not. Default is False.
  
          Notes
          -----
          `update` takes the same parameters as the constructor of `StringConverter`,
          except that `func` does not accept a `dtype` whereas `dtype_or_func` in
          the constructor does.
docstring_summary: Set StringConverter attributes directly.
docstring_tokens: Set StringConverter attributes directly .
function: def update(self, func, default=None, testing_value=None,
                 missing_values=asbytes(''), locked=False):
          """
          Set StringConverter attributes directly.
  
          Parameters
          ----------
          func : function
              Conversion function.
          default : any, optional
              Value to return by default, that is, when the string to be converted
              is flagged as missing. If not given, `StringConverter` tries to supply
              a reasonable default value.
          testing_value : str, optional
              A string representing a standard input value of the converter.
              This string is used to help defining a reasonable default value.
          missing_values : sequence of str, optional
              Sequence of strings indicating a missing value.
          locked : bool, optional
              Whether the StringConverter should be locked to prevent automatic
              upgrade or not. Default is False.
  
          Notes
          -----
          `update` takes the same parameters as the constructor of `StringConverter`,
          except that `func` does not accept a `dtype` whereas `dtype_or_func` in
          the constructor does.
  
          """
          self.func = func
          self._locked = locked
          # Don't reset the default to None if we can avoid it
          if default is not None:
              self.default = default
              self.type = self._dtypeortype(self._getdtype(default))
          else:
              try:
                  tester = func(testing_value or asbytes('1'))
              except (TypeError, ValueError):
                  tester = None
              self.type = self._dtypeortype(self._getdtype(tester))
          # Add the missing values to the existing set
          if missing_values is not None:
              if _is_bytes_like(missing_values):
                  self.missing_values.add(missing_values)
              elif hasattr(missing_values, '__iter__'):
                  for val in missing_values:
                      self.missing_values.add(val)
          else:
              self.missing_values = []
function_tokens: def update ( self , func , default = None , testing_value = None , missing_values = asbytes ( '' ) , locked = False ) : self . func = func self . _locked = locked # Don't reset the default to None if we can avoid it if default is not None : self . default = default self . type = self . _dtypeortype ( self . _getdtype ( default ) ) else : try : tester = func ( testing_value or asbytes ( '1' ) ) except ( TypeError , ValueError ) : tester = None self . type = self . _dtypeortype ( self . _getdtype ( tester ) ) # Add the missing values to the existing set if missing_values is not None : if _is_bytes_like ( missing_values ) : self . missing_values . add ( missing_values ) elif hasattr ( missing_values , '__iter__' ) : for val in missing_values : self . missing_values . add ( val ) else : self . missing_values = [ ]