fromrepeating.py

from fractions import Fraction
def fromrepeating(r):
    if type(r) == int:
        return(Fraction(r,1))
    if type(r) == float:
        return(Fraction(int(str(r).replace('.','')),10**(len(str(r))-str(r).index('.')-1)))
    if type(r) != str:
        return(None)
    if 'r' not in r:
        try:
            r = float(r)
            return(Fraction(int(str(r).replace('.','')),10**(len(str(r))-str(r).index('.')-1)))
        except ValueError:
            return(None)
    num,period=r.split('r')
    period = int(period)
    nr = num[:-period] #notrepeating
    nrf = Fraction(int(nr.replace('.','')),10**(len(nr)-nr.index('.')-1))
    rfnom = int(num[-period:])
    rfdenom = (10**(period)-1)*10**(len(nr)-nr.index('.')-1)
    return(nrf+Fraction(rfnom,rfdenom))