move test, fix py3 issue

Author: Felix Marczinowski

pandas/io/json.py

@@ -614,7 +614,7 @@ def nested_to_record(ds, prefix="", level=0):
         new_d = copy.deepcopy(d)
         for k, v in d.items():
             # each key gets renamed with prefix
-            if not isinstance(k, basestring):
+            if not isinstance(k, compat.string_types):
                 k = str(k)
             if level == 0:
                 newkey = k

pandas/io/tests/json/test_json_norm.py

@@ -2,6 +2,7 @@
 
 from pandas import DataFrame
 import numpy as np
+import json
 
 import pandas.util.testing as tm
 
@@ -164,6 +165,20 @@ def test_record_prefix(self):
 
         tm.assert_frame_equal(result, expected)
 
+    def test_non_ascii_key(self):
+        testjson = '[{"\xc3\x9cnic\xc3\xb8de":0,"sub":{"A":1, "B":2}},' \
+                   '{"\xc3\x9cnic\xc3\xb8de":1,"sub":{"A":3, "B":4}}]'
+
+        testdata = {
+            u'sub.A': [1, 3],
+            u'sub.B': [2, 4],
+            "\xc3\x9cnic\xc3\xb8de".decode('utf8'): [0, 1]
+        }
+        testdf = DataFrame(testdata)
+
+        df = json_normalize(json.loads(testjson))
+        tm.assert_frame_equal(df, testdf)
+
 
 class TestNestedToRecord(tm.TestCase):