String to dictionary

I am try开发者_StackOverflow中文版ing to convert a string to dictionary. Example:

Milk, Cheese, Bottle

The program will convert it to dictionary.

{"Milk":"NULL", "Cheese":"NULL", "Bottle":"NULL"}

How do I do it?

>>> string = 'Milk, Cheese, Bottle'
>>> dict((key, None) for key in string.split(', '))
{'Cheese': None, 'Milk': None, 'Bottle': None}

>>> s = "Milk, Cheese, Bottle"
>>> d = dict.fromkeys(s.split(', '),"NULL")
>>> d
{'Cheese': 'NULL', 'Milk': 'NULL', 'Bottle': 'NULL'}

dict.fromkeys((k.strip() for k in "Milk, Cheese, Bottle".split(',')), 'NULL')

s = 'Milk, Cheese'
d = { }
for s in s.split(', '):
    d[s] = 'NULL'

You can also use dictionary comprehensions in the latest Python versions:

s = 'Milk, Cheese'
d =  {key:'NULL' for key in s.split(', ')}

 >>> from collections import defaultdict:
 >>> s = "Milk, Cheese, Bottle"
 >>> j = s.split(',')
 >>> d = defaultdict()
 >>> for k in j:
     d[k]= 'NULL'
 >>> dict(d)

This is essentially the same solution as Zaur Nasibov's, but using list comprehension to run the for loop in fewer lines

s = "Milk, Cheese, Bottle"
d = dict((i, None) for i in [i.strip() for i in s.split(',')])

>>> print d
{'Cheese': None, 'Milk': None, 'Bottle': None}

Hope this helps