עזרה בפייתון דחוףף נושא רשימות

gradelst=[]
upperavg=[]
upto60=[]
for k in range(8):
grd=int(input("enter grade student"))
gradelst.append(grd)
sumgrd=0
for k in gradelst:
sumgrd+=k
print("the avg is:",sumgrd/8)
for k in gradelst:
if k>sumgrd/8:
upperavg.append(k)
if k<=60:
upto60.append(k)
if sumgrade/8>90:
print("extra sucsess")
print()