dict printing last key,value out of loop

[buran]

I am able to find all key and values in loop, but its printing only last key value out of loop

Yes, because you overwrite the previous value. What you print proves exactly that!!!!

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#list for BGP prefixes dicts
bgp_prefix_list = []
for line in ip_prefix:
    if 'ip ip-prefix' in line:
        #dict for BGP prefixes
        bgp_prefix_dict = {}
        prefix_name = line.strip().split(' ')[2]
        subnet = line.strip().split(' ')[6]+"/"+line.strip().split(' ')[7]
        bgp_subnet = str(IPNetwork(subnet))
        bgp_prefix_dict['prefix_name'] = prefix_name
        bgp_prefix_dict['bgp_subnet'] = bgp_subnet
        print(bgp_prefix_dict) #### Able to print current dict
        bgp_prefix_list.append(bgp_prefix_dict)
print(bgp_prefix_list)