In case your input is a string, you just have to use the string's .split method to split it into a list:

>>> original_string = "'ACC': 2, 'ACACAGTTTGCGCGCGCGGGG': 1, 'ACCGTA': 3, 'GCTTTAAAAAGGCAA': 1, 'ACCGTAACCTTG': 2"
>>> splitted = original_string.split(', ')
>>> splitted
["'ACC': 2",
 "'ACACAGTTTGCGCGCGCGGGG': 1",
 "'ACCGTA': 3",
 "'GCTTTAAAAAGGCAA': 1",
 "'ACCGTAACCTTG': 2"]
>>> for el in splitted: 
        print el + ','
'ACC': 2,
'ACACAGTTTGCGCGCGCGGGG': 1,
'ACCGTA': 3,
'GCTTTAAAAAGGCAA': 1,
'ACCGTAACCTTG': 2,

However, I suspect that you just want to print the contents of a dictionary in order to see them more clearly. If that is the case, have a look at the pprint function:

>>> import pprint
>>> mydict = {'ACC': 2, 'ACACAGTTTGCGCGCGCGGGG': 1, 'ACCGTA': 3, 'GCTTTAAAAAGGCAA': 1, 'ACCGTAACCTTG': 2}
>>> pprint.pprint(mydict)            
{'ACACAGTTTGCGCGCGCGGGG': 1,
 'ACC': 2,
 'ACCGTA': 3,
 'ACCGTAACCTTG': 2,
 'GCTTTAAAAAGGCAA': 1}

Also, consider using ipython instead of the standard python interpreter, which has many features and pretty-prints dictionaries by default.

Hi,

In the case where you really have a string to work with (like in your question), try this:

my_string = "'ACC': 2, 'ACACAGTTTGCGCGCGCGGGG': 1, \
            'ACCGTA': 3, 'GCTTTAAAAAGGCAA': 1, 'ACCGTAACCTTG': 2"

my_list = [x.strip() for x in my_string.split(",")]
for i in my_list:
    print i + "," # Added the comma as is is present in the form asked by the OP

As Istvan pointed out, you seem to have a dictionary, but this might provide an example of splitting and 'listifying' a string :)

Cheers

The string that you seem to have is a dictionary printed out directly on screen. The second output could be generated by something like:

mydict = {'ACC': 2, 'ACACAGTTTGCGCGCGCGGGG': 1, 'ACCGTA': 3, 'GCTTTAAAAAGGCAA': 1, 'ACCGTAACCTTG': 2}

print mydict

print '-----'

for key, value in mydict.items():
   print '%s:%s,' % (key, value)

this will print:

{'ACC': 2, 'ACACAGTTTGCGCGCGCGGGG': 1, 'ACCGTAACCTTG': 2, 'ACCGTA': 3, 'GCTTTAAAAAGGCAA': 1}
-----
ACC:2,
ACACAGTTTGCGCGCGCGGGG:1,
ACCGTAACCTTG:2,
ACCGTA:3,
GCTTTAAAAAGGCAA:1,

>>>a=''''ACC': 2, 'ACACAGTTTGCGCGCGCGGGG': 1, 'ACCGTA': 3, 'GCTTTAAAAAGGCAA': 1
, 'ACCGTAACCTTG': 2'''

>>> a.replace(',',',\n')
"'ACC': 2,\n 'ACACAGTTTGCGCGCGCGGGG': 1,\n 'ACCGTA': 3,\n 'GCTTTAAAAAGGCAA': 1,\n 'ACCGTAACCTTG': 2"

>>> print a.replace(',',',\n')
'ACC': 2,
'ACACAGTTTGCGCGCGCGGGG': 1,
'ACCGTA': 3,
'GCTTTAAAAAGGCAA': 1,
'ACCGTAACCTTG': 2