How to use the isodate.parse function in isodate

def evaluate(self, subj_py, obj_py):
        try:
            return isodate.parse(subj_py) == isodate.parse(obj_py)
        except ValueError:
            return None

def evaluateObject(self, subj_py):
        try:
            return str(isodate.parse(subj_py))
        except:
            return None

def evaluateObject(self,  subj_py):
        weekdayZero = time.gmtime(0)[6]
        return (weekdayZero + int(isodate.parse(subj_py)/DAY)) % 7 

def evaluateObject(self, subj_py):
        try:
            return float(isodate.parse(subj_py))
        except ValueError, AssertionError:
            progress("Warning: Failed to parse time string '%s'" % subj_py)
            return None

def evaluateObject(self, subj_py):
        try:
            return float(isodate.parse(subj_py))
        except ValueError, AssertionError:
            progress("Warning: Failed to parse time string '%s'" % subj_py)
            return None

def evaluate(self, subj_py, obj_py):
        try:
            return isodate.parse(subj_py) == isodate.parse(obj_py)
        except ValueError:
            return None

def evaluateObject(self,  subj_py):
        weekdayZero = time.gmtime(0)[6]
        return str((weekdayZero + int(isodate.parse(subj_py)/DAY)) % 7 )

def evaluate(self, subj_py, obj_py):
        try:
            return isodate.parse(subj_py) == isodate.parse(obj_py)
        except:
            return None