Question

I look for something that will count values in dict (automatically)without use a list of element

d = {}

d["x1"] = "1"
{'x1':'1'}

d["x1"] = "2"
{'x1':'2'}

d["x1"] = "3"
{'x1':'3'}

d["x2"] = "1"
{'x1':'3', 'x2':'1'}

ect..

I try create a list them using

for x in list:
    d[x] = list.count(x)

But when I created a list , I receive a memory error

Answer 1

Are you sure you want to use a dict to do it? It seems a Counter or a defaultdict suits your need more.

>>> d = collections.Counter()
>>> d['x1'] += 1
>>> d
Counter({'x1': 1})
>>> d['x1'] += 1
>>> d
Counter({'x1': 2})
>>> d['x2'] += 1
>>> d
Counter({'x1': 2, 'x2': 1})

You could also convert a sequence to a counter:

>>> collections.Counter(['x1', 'x1', 'x2'])
Counter({'x1': 2, 'x2': 1})