CODEWITHSUNDEEP
pythondictionary
Ghilas BELHADJ
Ghilas BELHADJ

Reputation: 14124

Work with tuples as dictionary keys

I use GraphViz library and in some case, it retuns me a dictionary having tuple as keys.

{(4, 7): 0, (2, 6): 1, (10, 4): 1, (5, 11): 1, (4, 5): 1,
(2, 8): 0, (8, 11): 0, (10, 0): 1, (6, 11): 1, (9, 11): 1,
(1, 9): 0, (10, 1): 0, (7, 11): 1, (0, 9): 1, (3, 7): 1,
(10, 3): 1, (10, 2): 1}

For some reason, I would like to get the second number in the tuples where: the first number == 10 and the value == 1

I've tried to access the dictionary with (10, ) but I think this syntax is not allowed in python.

the answer should be : [4 ,0 ,3 , 2]

Upvotes: 1

Views: 122

Answers (3)

Ashwini Chaudhary
Ashwini Chaudhary

Reputation: 251196

(10, ) is a perfectly valid syntax, but that will raise KeyError here. To get the desired output you'll have to use a loop here:

>>> d = {(4, 7): 0, (2, 6): 1, (10, 4): 1, (5, 11): 1, (4, 5): 1,
... (2, 8): 0, (8, 11): 0, (10, 0): 1, (6, 11): 1, (9, 11): 1,
... (1, 9): 0, (10, 1): 0, (7, 11): 1, (0, 9): 1, (3, 7): 1,
... (10, 3): 1, (10, 2): 1}
>>> [k[1] for k, v in d.items() if k[0] == 10 and v == 1]
[4, 0, 3, 2]

Upvotes: 1

Lev Levitsky
Lev Levitsky

Reputation: 65871

You'll have to iterate over the dictionary, e.g.:

In [1]: d = {(4, 7): 0, (2, 6): 1, (10, 4): 1, (5, 11): 1, (4, 5): 1,
   ...: (2, 8): 0, (8, 11): 0, (10, 0): 1, (6, 11): 1, (9, 11): 1,
   ...: (1, 9): 0, (10, 1): 0, (7, 11): 1, (0, 9): 1, (3, 7): 1,
   ...: (10, 3): 1, (10, 2): 1}

In [2]: [b for (a, b), v in d.items() if a == 10 and v == 1]
Out[2]: [4, 0, 3, 2]

Upvotes: 6

Todd Tao
Todd Tao

Reputation: 51

result=[]
for key in your_dict.keys():
  if key[0]==10 and your_dict[key]==1:
    result.append(key[1])

Upvotes: 1

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