A list as a key for a dictionary

Question

I have multiple lists of tuples eg

[([1, 2, 3, 4], 2), ([5, 6, 7], 3)]

that I would like to have as keys to a dictionary (so each key in my dic

Answer 1

Use repr

class A:
    pass

import time

# A and time as heterogenous elements, only to show the generality of my solution

li_li = [ [([1,2,3,4],2),([5,6,7],3)] ,
          [([10,20,3],2),      ([5,6,77],3)] ,
          [([1,2,3,4],2),([5,6,time,7],3),([875,12], ['jk',78], A, (100,23),'zuum')] ]




didi = {}
for i,li in enumerate(li_li):
    didi[repr(li)] = i

print 'dictionary  didi:'
for k,v in didi.iteritems():
    print k,'     ',v

print '----------------------------------'

print didi[repr([([1+1+1+1+1+5,         200000/10000,    3],2),([5,8-2,7*11],3)      ])]

result

dictionary  didi:
[([1, 2, 3, 4], 2), ([5, 6, , 7], 3), ([875, 12], ['jk', 78], , (100, 23), 'zuum')]       2
[([1, 2, 3, 4], 2), ([5, 6, 7], 3)]       0
[([10, 20, 3], 2), ([5, 6, 77], 3)]       1
----------------------------------
1