old_contents: # -*- coding: utf-8 -*-
  
  """
      This module provides some default ArgumentExpressions
  """
  
  from radish.argexpregistry import arg_expr
  
  
  @arg_expr("Number", r"(\+|-)?\d+")
  def arg_expr_number(text):
      """
          Argument Expression which expects a valid number
  
          :param str text: the text which was matched as number
  
          :returns: integer number
          :rtype: int
      """
      return int(text)
  
  
  @arg_expr("FloatNumber", r"(\+|-)?\d+(\.\d+)?")
  def arg_expr_floatnumber(text):
      """
          Argument Expression which expects a valid floating point number
  
          :param str text: the text which was matched as floating point number
  
          :returns: float number
          :rtype: float
      """
      return float(text)
  
  
  @arg_expr("MathExpression", r"[0-9 +\-*/%.e]+")
  def arg_expr_mathexpression(text):
      """
          Argument Expression which expects a valid math expression
  
          :param str text: the text which was matched as math expression
  
          :returns: calculated float number from the math expression
          :rtype: float
      """
      return float(eval(text))
  
  
  @arg_expr("VariableName", r"[A-Za-z_][A-Za-z0-9_]*")
  def arg_expr_variablename(text):
      """
          Argument Expression which expects a variable name
  
          :param str text: the text which was matched as variable name
  
          :returns: the variable name
          :rtype: str
      """
      return text
  
new_contents: # -*- coding: utf-8 -*-
  
  """
      This module provides some default ArgumentExpressions
  """
  
  from radish.argexpregistry import arg_expr
  
  
  @arg_expr("MathExpression", r"[0-9 +\-*/%.e]+")
  def arg_expr_mathexpression(text):
      """
          Argument Expression which expects a valid math expression
  
          :param str text: the text which was matched as math expression
  
          :returns: calculated float number from the math expression
          :rtype: float
      """
      return float(eval(text))
  
subject: Remove obsolete code