Checking if a list is already in the dictionary in python -

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i trying check if list s in dictionary in python. code supposed generate 2 random numbers(r1 , r2) , append them list in dictionary if same 2 numbers aren't in there. here code:

main_dict = {0:[], 1:[], 2:[], 3:[], 4:[]} x in range(0,5):     r1 = randint(1,5)     r2 = randint(1,5)     temp = [r1,r2]     if temp not in main_dict:         main_dict[x].append(r1)         main_dict[x].append(r2)

so main_dict should this: {0:[2,3],1:[4,1],2:[3,3],3:[3,2],4:[5,1]}, , code above should take care no combination repeated.

the error "typeerror:unhashable type: 'list'", , guess because can't put list next if, have no idea else put, have tried came mind.

thanks in advance :)

the problem getting because looking in dictionary if list exists. that, comparing list keys of dictionary. want is: 

if temp not in manin_dict.values():

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