How to append lists in a dictionary in Python?

Hey everyone this code is working fine just one thing to deal with. It overwrites the multiple entries against a key. I need to avoid the overwriting and to save all those entries. Can you help me in this please?

#!/usr/bin/python

import sys
import fileinp开发者_运维知识库ut

#trys to create dictionary from african country list
dic = {}

for line in sys.stdin:
    lst = line.split('|')
    links = lst[4].split()
    new=links[0] + ' ' + links[len(links)-1]
    dic[new]=lst[4] # WARNING: overwrites multiple entriess at the moment! :)

for newline in fileinput.input('somefile.txt'):
    asn = newline.split()
    new = asn[0] + ' ' + asn[1]
    if new in dic:
            print "found from " + asn[0] + " to " + asn[1]
            print dic[new]

Note: Sys.stdin takes a string in the following format; 1.0.0.0/24|US|158.93.182.221|GB|7018 1221 3359 3412 2543 1873

You've got a number of problems with your code. The simplest way to do what you describe is to use a defaultdict, which gets rid of the explicit if and has_key (which you should replace by new in dic anyway):

#trys to create dictionary from african country list
from collections import defaultdict

dic = defaultdict(list)   # automatically creates lists to append to in the dict

for line in sys.stdin:
    mylist = line.split('|')    # call it mylist instead of list
    links = mylist[4].split()
    new = links[0] + ' ' + links[-1]   # can just use -1 to reference last item
    dic[new].append(mylist[4])         # append the item to the list in the dict
                                # automatically creates an empty list if needed

See eryksun's comment on Gerrat's answer if you're on an old version of Python without defaultdict.

There is no method called appendlist. use append:

dic[dic[new]].append(list[4])

Also, it's inadvisable to use list as a variable name.
It is a builtin in python.

Also, this entire section of code:

    if ( dic.has_key(new))
        dic[dic[new]].appendlist(list[4])
    else:
       dic[dic[new]] = [list[4]] 

should instead probably be:

    if new in dic:  # this is the preferrable way to test this
        dic[new].append(list[4])
    else:
       dic[new] = [list[4]]