CODEWITHSUNDEEP
python
jinwazi
jinwazi

Reputation: 1

Python: How to reference element of a tuple that is in a dictionary

for example I have a dict var defined as below:

var{m:(a, b)}

And now I want to reference the value of 'a' in a for loop

suppose var is filled with some instances as below

var = {0: {'1a': (502, 2)}, 1: {'2b': (103, 3)}}

Upvotes: 0

Views: 224

Answers (5)

bluepnume
bluepnume

Reputation: 17158

Right, so you want v[0]['1a'][0]

EDIT: In response to your comment, you probably want:

for key, value in v[k].items():
  print value[0]

Upvotes: 1

Akavall
Akavall

Reputation: 86366

Is this what you are looking for?

var = {'m':('a', 'b'), 'n': ('c','d')}

a_coords = [(k,v.index('a')) for k,v in var.iteritems() if 'a' in v ]

Result:

>>> a_coords
[('m', 0)]

'm' is the key that is associated with the value of a tuple that holds a, and 0 is the index where a is located.

Upvotes: 0

TryPyPy
TryPyPy

Reputation: 6434

Let's see if this generic example can make it clear by naming the items we get descriptively.

var = {0: {'1a': (502, 2)}, 1: {'2b': (103, 3)}}

You want to iterate on all dicts that var contains and iterate on what they contain.

for number, innerdict in var.items(): # first time around number is e.g. 0 and innerdict is e.g. {'1a': (502, 2)}
    print number
    for numberletter, tup in innerdict.items(): # first time around numberletter is e.g. 1a and tup is e.g. (502, 2) 
        print numberletter, tup
        for tuplenumber in tup: # first time around tuplenumber is e.g. 502
            print tuplenumber

Upvotes: 0

the paul
the paul

Reputation: 9161

You may want, rather:

for k, (v1, v2) in var.iteritems():
    print v1

Or if not all of your dict values are going to have two items (or if your version of Python doesn't do multilevel tuple unpacking):

for k, v in var.iteritems():
    print v[0]

Upvotes: 1

Carlo Pires
Carlo Pires

Reputation: 4926

May be this is what you are wanting:

var = {0: {'1a': (502, 2)}, 1: {'2b': (103, 3)}}

for m, elements in var.items():
    for a, b in elements.values():
        print a

Upvotes: 1

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