How to add multiple values to a key in a Python dictionary -

i trying create dictionary values in name_num dictionary length of list new key , name_num dictionary key , value value. so:

name_num = {"bill": [1,2,3,4], "bob":[3,4,2], "mary": [5, 1], "jim":[6,17,4], "kim": [21,54,35]} 

i want create following dictionary:

new_dict = {4:{"bill": [1,2,3,4]}, 3:{"bob":[3,4,2], "jim":[6,17,4], "kim": [21,54,35]}, 2:{"mary": [5, 1]}} 

i've tried many variations, code gets me closest:

for mykey in name_num:     new_dict[len(name_num[mykey])] = {mykey: name_num[mykey]} 

output:

new_dict = {4:{"bill": [1,2,3,4]}, 3:{"jim":[6,17,4]}, 2:{"mary": [5, 1]}} 

i know need loop through code somehow can add other values key 3.

dictionary, associative array or map (many names, same functionality) property keys unique.

the keys wish have, integers, not unique if lengths same, that's why code doesn't work. putting new value existing key means replacing old value.

you have add key-value pairs existing value dictionaries.

for mykey in name_num:     length = len(name_num[mykey])     if length in new_dict: # key present in new dictionary         new_dict[length][mykey] = name_num[mykey]     else:         new_dict[length] = {mykey: name_num[mykey]} 

should trick