I need to check for floating point numbers inside my class but it doesn't seem to be working. Any suggestions?

class Rectangle:

    def __init__(self, length = 1, width = 1):
        self.__length = length
        self.__width = width

    ##Setters to float
    def set_length(self, length):
        self.__length = float(length)
        try:
            #self.__length = float(length)
            if self.__length > 0.0 and self.__length < 20.0:
                print "Value is in range.  You may continute."
            else:
                raise ValueError
        except ValueError:
            print "Value must be between 0.0 and 20.0"

    def set_width(self, width):
        self.__width = float(width)
        try:
            #self.__width = float(width)
            if self.__width > 0.0 and self.__width < 20.0:
                print "Value is in range.  You may continute."
            else:
                raise ValueError
        except ValueError:
            print "Value must be between 0.0 and 20.0"
##Getters
    def get_length(self):
        return self.__length

    def get_width(self):
        return self.__width

##Get perimeter and area
    def perimeter(self):
        return 2 * self.__length + 2 * self.__width

    def area(self):
        return self.__length * self.__width
import rectclass

def main():
    ## Get length and width

    print 'Enter numeric data greater than 0.0 but less than 20.0'
    print
    a_len = input('Enter Length: ')
    print
    wide = input('Enter Width: ')

    calculations = rectclass.Rectangle(a_len, wide)

    print calculations.perimeter()
    print
    print calculations.area()

main()

Here it is. Now it works.

class Rectangle:

    def __init__(self, length = 1, width = 1):
        self.set_length(length)
        self.set_width(width)

    ##Setters to float
    def set_length(self, length):
        length = float(length)
        try:
            if 0.0 < length < 20.0:
                print "Value is in range.  You may continute."
                self._length = length
            else:
                raise ValueError
        except ValueError:
            print "Value must be between 0.0 and 20.0"

    def set_width(self, width):
        width = float(width)
        try:
            if 0.0 < width < 20.0:
                print "Value is in range.  You may continute."
                self._width = width
            else:
                raise ValueError
        except ValueError:
            print "Value must be between 0.0 and 20.0"
##Getters
    def get_length(self):
        return self._length

    def get_width(self):
        return self._width

##Get perimeter and area
    def perimeter(self):
        return 2 * self._length + 2 * self._width

    def area(self):
        return self._length * self._width

Cheers and Happy coding

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