Re: how to change a string into dictionary

2010-08-09 Thread Daniel Urban 
> a = "{'a':'1','b':'2'}"
> how to change a into a dictionary ,says, a = {'a':'1','b':'2'}

See also the ast.literal_eval function:
http://docs.python.org/py3k/library/ast.html#ast.literal_eval


Daniel
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Re: how to change a string into dictionary

2010-08-09 Thread Ulrich Eckhardt 
aimeixu wrote:
> a = "{'a':'1','b':'2'}"
> how to change a into a dictionary ,says, a = {'a':'1','b':'2'}

You could evaluate it as regular Python code, using "exec":

  res = {}
  exec("a={'a':'1'}", res)
  print res['a']

However, if this is input from a file or the user, be aware that this opens
loopholes for executing _any_ code, so you should only exec code from
sources you can trust.

Uli

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Re: how to change a string into dictionary

2010-08-09 Thread Chris Rebert 
On Mon, Aug 9, 2010 at 2:53 AM, Shashwat Anand  wrote:
> On Mon, Aug 9, 2010 at 3:03 PM, aimeixu  wrote:
>> Hi,
>> I am newbie for python ,Here is my question:
>> a = "{'a':'1','b':'2'}"
>> how to change a into a dictionary ,says, a = {'a':'1','b':'2'}
>> Thanks a lot .Really need help.
>
> Parse the string and re-create the dictionary.
 s = "{'a':'1','b':'2'}"
 ds = {}
 for i in s.strip('{}').split(','):
> ...     key, val = i.split(':')
> ...     ds[key.strip("'")] = val.strip("'")

Just for the record, that'll break if the dictionary entries have
embedded commas or colons.
eval() will handle such cases correctly and probably* run faster, but
is obviously insecure.

If you have control of both ends of the serialization process, you
might consider using the `json` or `pickle` std lib modules instead.

Cheers,
Chris
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Re: how to change a string into dictionary

2010-08-09 Thread Shashwat Anand 
On Mon, Aug 9, 2010 at 3:03 PM, aimeixu  wrote:

> Hi,
> I am newbie for python ,Here is my question:
> a = "{'a':'1','b':'2'}"
> how to change a into a dictionary ,says, a = {'a':'1','b':'2'}
> Thanks a lot .Really need help.
>

Parse the string and re-create the dictionary.

>>> s = "{'a':'1','b':'2'}"
>>> ds = {}
>>> for i in s.strip('{}').split(','):
... key, val = i.split(':')
... ds[key.strip("'")] = val.strip("'")
...
>>> ds
{'a': '1', 'b': '2'}
>>> type(ds)



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how to change a string into dictionary

2010-08-09 Thread aimeixu 

Hi,
I am newbie for python ,Here is my question:
a = "{'a':'1','b':'2'}"
how to change a into a dictionary ,says, a = {'a':'1','b':'2'}
Thanks a lot .Really need help.
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