[Tutor] Dictionary - count values where values are stored as a list

[Ricardo Aráoz]

GTXY20 wrote:
> Hello,
> 
> Any way to display the count of the values in a dictionary where the
> values are stored as a list? here is my dictionary:
> 
> {'1': ['a', 'b', 'c'], '3': ['a', 'b', 'c'], '2': ['a', 'b', 'c'], '4':
> ['a', 'c']}
> 
> I would like to display count as follows and I would not know all the
> value types in the values list:
> 
> Value QTY
> a       4
> b       3
> c       4
> 
> Also is there anyway to display the count of the values list
> combinations so here again is my dictionary:
> 
> {'1': ['a', 'b', 'c'], '3': ['a', 'b', 'c'], '2': ['a', 'b', 'c'], '4':
> ['a', 'c']}
> 
> 
> And I would like to display as follows
> 
> QTY Value List Combination
> 3      a,b,c
> 1      a,c
> 
> Once again all help is much appreciated.
> 
> M.
> 

>>> D = {'1':['a', 'b', 'c'],
         '3':['a', 'b', 'c'],
         '2':['a', 'b', 'c'],
         '4':['a', 'c']
         }
>>> d = {}
>>> for v in reduce(lambda x, y: x+y, [b for a,b in D.iteritems()]):
...     d[v] = d.setdefault(v, 0) + 1
...
>>> for k, v in d.iteritems():
...     print k, v
...
a 4
c 4
b 3

>>> ld = {}
>>> for v in [''.join(b) for a,b in D.iteritems()]:
...     d[v] = d.setdefault(v, 0) + 1
...
>>> for k, v in d.iteritems():
...     print v, list(k)
...
1 ['a', 'c']
3 ['a', 'b', 'c']


HTH