Today there is a problem that a colleague json string must be loads twice before, this very drive interest, and would like to do the experiment
In [42]: a = {"1":2} In [43]: a Out[43]: {'1': 2} In [44]: b = json.dumps(a) In [45]: b Out[45]: '{"1": 2}' In [46]: print(b) {"1": 2} In [47]: c = json.dumps(b) In [48]: c Out[48]: '"{\\"1\\": 2}"' In [49]: print(c) "{\"1\": 2}" In [50]: d = json.dumps(c) In [51]: d Out[51]: '"\\"{\\\\\\"1\\\\\\": 2}\\""' In [52]: print(d) "\"{\\\"1\\\": 2}\"" In [53]: e = json.loads(d) In [ 54 ]; and Out[54]: u'"{\\"1\\": 2}"' In [55]: f = json.loads(e) In [56]: f Out[56]: u'{"1": 2}' In [57]: g = json.loads(f) In [58]: g Out[58]: {u'1': 2}
The conclusion is json unlimited nesting dumps a dictionary, and the corresponding json.loads can not stop layer by layer untied the string
To a eggs:
def f(dicta): a = dicta while 1: b = json.dumps(a) b, a = a, b yield a
In [74]: dicta = {"a":"1"} In [75]: b = f(dicta) In [76]: for i in range(10): ...: c = b.next() ...: In [77]: c Out[77]: 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\ Quantity is also interesting 2,6,14 Such increased, a (n) = a (n-1) * 2 + 2
Because the outside with another layer, "so it is necessary \ to escape while the \ have a \ escape, all the original \ escape so we'll have so much yet
I feel very interesting, ah, and they want a completely different
Json day can read the source code to see why in the end