Unable to update dictionary

Question

I am facing this problem while trying to code a Sudoku solver (with some parts referencing to http://norvig.com/sudoku.html )

Here's the code I have made so far with reference to the above URL.

 puzzle = '003198070890370600007004893030087009079000380508039040726940508905800000380756900' cell = '123456789' cell_break = ['123','456','789'] def generate_keys(A, B): "Cross product of elements in A and elements in B." return [a+b for a in A for b in B] #print generate_keys(cell,cell) def dict_puzzle(puzzle,cell): 'Making a dictionary to store the key and values of the puzzle' trans_puzzle = {} key_list = generate_keys(cell,cell) i=0 for x in puzzle: trans_puzzle[str(key_list[i])] = x i = i + 1 return trans_puzzle dict_puzzle(puzzle,cell)['11'] = 'die' print dict_puzzle(puzzle,cell)['11']

for the last 2 lines of the code, I tried to mutate the dictionary but to no avail. It just returns me 0, which is the original value. (ie the mutation wasnt successful)

I am not sure why is this happening :(

Answer 1

You're calling the function again, so it returns a new dictionary. You need to assign the result of the first call to a variable and mutate that.

result = dict_puzzle(puzzle,cell)
result['11'] = 'die'
print(result)