Python convert set to string and vice versa

Question

Set to string  Obvious    gt  gt  gt  s   set  1 2 3    gt  gt  gt  s set  1  2  3    gt  gt  gt  str s   set  1  2  3      String to set  Maybe like this    gt  gt  gt  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

User · Answer

If you do not need the serialized text to be human readable, you can use pickle.

import pickle

s = set([1,2,3])

serialized_s = pickle.dumps(s)
print "serialized:"
print serialized_s

deserialized_s = pickle.loads(serialized_s)
print "deserialized:"
print deserialized_s

Result:

serialized:
c__builtin__
set
p0
((lp1
I1
aI2
aI3
atp2
Rp3
.
deserialized:
set([1, 2, 3])

User · Answer

The question is little unclear because the title of the question is asking about string and set conversion but then the question at the end asks how do I serialize      let me refresh the concept of Serialization is the process of encoding an object  including the objects it refers to  as a stream of byte data   If interested to serialize you can use   json dumps  - gt  serialize json loads  - gt  deserialize   If your question is more about how to convert set to string and string to set then use below code  it s tested in Python 3    String to Set  set  abca     Set to String      join some var set    example   def test        some var set set  abca       print  here is the set   some var set type some var set       some var string    join some var set          print  here is the string   some var string type some var string    test

User · Answer

Use repr and eval    gt  gt  gt  s   set  1 2 3    gt  gt  gt  strs   repr s   gt  gt  gt  strs  set  1  2  3     gt  gt  gt  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    gt  gt  gt  from ast import literal eval  gt  gt  gt  s   set  10  20  30    gt  gt  gt  lis   str list s    gt  gt  gt  set literal eval lis   set  10  20  30     help on repr   repr object  - gt  string Return the canonical string representation of the object  For most object types  eval repr object      object

User · Answer

Try like this    gt  gt  gt  s   set  1 2 3    gt  gt  gt  s   list s   gt  gt  gt  s  1  2  3    gt  gt  gt  str        join str e  for e in s   gt  gt  gt  str    set  s     str  gt  gt  gt  str  set 1  2  3

[python] Python convert set to string and vice versa

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