ValueError: not enough values to unpack (expected 2, got 1) in proxy

Question

i am creating a function to loop through a list of IPs but i'm getting the ValueError: not enough values to unpack (expected 2, got 1)

def cidr_to_ips():
    for i in range(len(blocked_cidr)):
        (ip, cidr) = blocked_cidr[i].split('/')
        cidr = int(cidr)
        host_bits = 32 - cidr
        i = struct.unpack('>I', socket.inet_aton(ip))[0]
        start = (i >> host_bits) << host_bits
        end = start | ((1 << host_bits))
        end += 1
        for i in range(start, end):
            tp_ip = socket.inet_ntoa(struct.pack('>I', i))
            blocked_ips.append(tp_ip)