Count number of ips in a file with cidr range per line

ipcounter.py

dict={}

for i in range(1,33):
    dict[i]=2**(32-i)

with open('amz.txt') as f:
   for line in f:
      sn = line.split('/')[1]
      cur = dict[int(sn.strip())]
      ipcount = ipcount + cur

print(ipcount)