class inheritance and property

[heddapacman]

Ive given up on doing classes and made funktions instead but i still fail!!
this is how in trying to work it out

test=open('testing.dat','r')

bird=open('birds.dat','r')


        
def DataError (data):
    movements=[]
    date=[]
    time=[]
    for n in enumerate(data):
        c=n[1].split()
        date.append(c[0])
        time.append(c[1])
        movements.append(int(c[2]))
    LN=[]
    for n in range(len(time)-1):
        LN.append(int(time[n][0:2])*24*60+int(time[n][3:5])*60+int(time[n][6:8]))
    for k in range(len(LN)-1):
        if LN[k+1]-LN[k] > 160:
            LN.insert(k+1,LN[k]+120)
            date.insert(k+1,date[k]) 
            movements.insert(k+1,movements[k])
    for n in range(0, len(movements)-1):
        if movements[n+1]-movements[n]>4:
            movements[n+1]=movements[n]+4
        if movements[n+1]<movements[n]:
            movements[n+1]=movements[n]
        movement=np.diff(movements)
        time=LN
    return time, date, movements


#print(DataError(test))

def plotting(data, givendate):
        D=[]
        T=[]
        M=[]
        DataError(data)
        for i in [i for i,x in enumerate(date) if x==givendate]:
            for n in range (0,2161):
                D.append(date[i+n])
                M.append(movements[i+n])
                T.append(time[i:i+n])
        return D, M, T
        #sun = city.sun(date=datetime.date(2009, 4, 22), local=True)
        #plot( str(sun['sunrise']),M)
        #plot( str(sun['sunset']),M)
        
print(plotting(bird,'2015-01-25'))