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?
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Answer
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.