Convert set to string and vice versa

python, python-2.7, set, string

Solution

Use `repr` and `eval`:

>>> s = set([1,2,3])
>>> strs = repr(s)
>>> strs
'set([1, 2, 3])'
>>> eval(strs)
set([1, 2, 3])

Note that `eval` is not safe if the source of string is unknown, prefer `ast.literal_eval` for safer conversion:

>>> from ast import literal_eval
>>> s = set([10, 20, 30])
>>> lis = str(list(s))
>>> set(literal_eval(lis))
set([10, 20, 30])

help on `repr`:

repr(object) -> string
Return the canonical string representation of the object.
For most object types, eval(repr(object)) == object.

Problem

Set to string. Obvious: ``` >>> s = set([1,2,3]) >>> s set([1, 2, 3]) >>> str(s) 'set([1, 2, 3])' ``` String to set? Maybe like this? ``` >>> set(map(int,str(s).split('set([')[-1].split('])')[0].split(','))) set([1, 2, 3]) ``` Extremely ugly. Is there better way to serialize/deserialize sets?

Original source