json - Python dict deserialization works in python2.7, fails in 3.3 -

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i'm using sqlite3 table store python dicts (utf8 content) , serialization done json. works fine in python2.7 fails in 3.3.

schema:

create table mytable   (id integer, book text not null, d json not null, priority integer not null default(3),     primary key (id, book))

when inserting values, dict serialized json.dumps(d). faulty part retrieving saved values.

import sys import sqlite3 import json  filename = 'mydb.db' sqlite3.register_converter('json', json.loads) conn = sqlite3.connect(filename, detect_types=sqlite3.parse_decltypes|sqlite3.parse_colnames) c = conn.cursor() c.execute('''select book, id, d, priority mytable''') print(c.fetchall())

the above script works fine when executed python2.7. however, using 3.3 typeerror occures:

traceback (most recent call last):   file "tests/py3error_debug.py", line 15, in <module>     c.execute('''select book, id, d, priority mytable''')   file "/usr/local/cellar/python3/3.3.2/frameworks/python.framework/versions/3.3/lib/python3.3/json/__init__.py", line 319, in loads     return _default_decoder.decode(s)   file "/usr/local/cellar/python3/3.3.2/frameworks/python.framework/versions/3.3/lib/python3.3/json/decoder.py", line 352, in decode     obj, end = self.raw_decode(s, idx=_w(s, 0).end()) typeerror: can't use string pattern on bytes-like object

i can't spot essential difference between 2.7 , 3.3 json modules (especially regarding json.loads) , i'm running out of ideas.

according python 3 json module documentation:

the json module produces str objects, not bytes objects. ...

according python 3 sqlite3.register_converter documentation:

registers callable convert bytestring database custom python type. ...

if try load bytesstring json, typeerror:

>>> json.loads('"0"') '0' >>> json.loads(b'"0"') traceback (most recent call last):   file "<stdin>", line 1, in <module>   file "/usr/lib/python3.3/json/__init__.py", line 319, in loads     return _default_decoder.decode(s)   file "/usr/lib/python3.3/json/decoder.py", line 352, in decode     obj, end = self.raw_decode(s, idx=_w(s, 0).end()) typeerror: can't use string pattern on bytes-like object

you should convert bytes str before call json.loads using bytes.decode.

sqlite3.register_converter('json', lambda x: json.loads(x.decode('utf-8')))

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