pcount=0
ncount=0
zcount=0
for i in range(0,n):
    if(arr[i]>0):
        pcount=pcount+1
    elif(arr[i]<0):
        ncount=ncount+1
    else:
        zcount=zcount+1
pcountfr=float(pcount/n)
ncountfr=float(ncount/n)
zcountfr=float(zcount/n)
print(pcountfr)
print(ncountfr)
print(zcountfr)

Traceback (most recent call last):
  Line 4, in <module>
    for i in range(0,n):
NameError: name 'n' is not defined