Python 将集转换为字符串，反之亦然
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Python convert set to string and vice versa
提问by ov7a
Set to string. Obvious:
设置为字符串。明显的：
>>> s = set([1,2,3])
>>> s
set([1, 2, 3])
>>> str(s)
'set([1, 2, 3])'
String to set? Maybe like this?
要设置的字符串？也许像这样？
>>> 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?
极其丑陋。有没有更好的方法来序列化/反序列化集合？
采纳答案by Ashwini Chaudhary
Use reprand eval:
使用repr和eval：
>>> s = set([1,2,3])
>>> strs = repr(s)
>>> strs
'set([1, 2, 3])'
>>> eval(strs)
set([1, 2, 3])
Note that evalis not safe if the source of string is unknown, prefer ast.literal_evalfor safer conversion:
请注意，eval如果字符串的来源未知，则不安全，更喜欢ast.literal_eval更安全的转换：
>>> 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:
帮助repr：
repr(object) -> string
Return the canonical string representation of the object.
For most object types, eval(repr(object)) == object.
回答by Adem ?zta?
Try like this,
试试这样，
>>> s = set([1,2,3])
>>> s = list(s)
>>> s
[1, 2, 3]
>>> str = ', '.join(str(e) for e in s)
>>> str = 'set(%s)' % str
>>> str
'set(1, 2, 3)'
回答by Kevin
If you do not need the serialized text to be human readable, you can use pickle.
如果您不需要序列化文本是人类可读的，您可以使用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:
结果：
serialized:
c__builtin__
set
p0
((lp1
I1
aI2
aI3
atp2
Rp3
.
deserialized:
set([1, 2, 3])
回答by grepit
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 ? !
这个问题有点不清楚，因为问题的标题是关于字符串和集合转换，但最后的问题是如何序列化？！
let me refresh the concept of Serializationis the process of encoding an object, including the objects it refers to, as a stream of byte data.
让我刷新一下序列化的概念是将对象（包括它所引用的对象）编码为字节数据流的过程。
If interested to serialize you can use:
如果有兴趣序列化，您可以使用：
json.dumps -> serialize
json.loads -> 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)
如果您的问题更多是关于如何将 set 转换为 string 和 string to set 然后使用下面的代码（它在 Python 3 中测试过）
String to Set
要设置的字符串
set('abca')
Set to String
设置为字符串
''.join(some_var_set)
example:
例子：
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()
