Python: convert temperature

Abstract: convert temperature

The script:

class units_conversion:

     def __init__(self, input):

          self.input=float(input)

     def remove_char(self):

          num="".join(i for i in self.input if i.isdigit() )

          return num

     def temp_C_F(self, digits=""):

          F=self.input*(9/5)+32

          if not digits=="":

               F=round(F, digits)

          return(F)

     def temp_F_C(self, digits=""):

          C=(self.input-32)*5/9

          if not digits=="":

               C=round(C, digits)

          return(C)

#############

#main program

u=units_conversion(-10.3454)

#from Celsius to Fahrenheit

print u.temp_C_F(), 'F'

#round temprature

print u.temp_C_F(2), 'F'

#from Fahrenheit to Celsius

print u.temp_F_C(3), 'C'

Writing date: 20150514