Data viewer doesn't like lists of datetime objects that all have a tzinfo

Environment data

• VS Code version: 1.36.0-insider 11b88a33
• Extension version 2019.5.18875
• OS and version: Current Arch Linux x86_64
• Python version: 3.7.3
• Type of virtual environment used: N/A
• Relevant/affected Python packages and their versions: pandas 0.24.2
• Jedi or Language Server? Jedi

Steps to reproduce:

Run the following script in the Python interactive window and inspect the variables list1 and list2 in the data viewer:

#%%
from datetime import datetime, timezone

#%% list1 displays just fine in the data viewer
list1 = [
    datetime(2019, 6, 22), 
    datetime(2019, 6, 22), 
    datetime(2019, 6, 22)]

#%% list2 shows all cells as "loading ..."
list2 = [
    datetime(2019, 6, 22, tzinfo=timezone.utc), 
    datetime(2019, 6, 22, tzinfo=timezone.utc), 
    datetime(2019, 6, 22, tzinfo=timezone.utc)]

#%%

Works for me just fine for list1:

but gets stuck at “loading …” for list2:

Note that I tried lists with various combinations of entries with and without tzinfo and the only szenario that seems to trigger the bug is when all are created with tzinfo.

Logs

Output from Console under the Developer Tools panel

This seem to be the relevant bit:

console.ts:134 [Extension Host] Error Python Extension: 2019-06-22 16:53:19: Failure during variable extraction:
---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
<ipython-input-4-e695ca9d874d> in <module>     31 # Turn into JSON using pandas. We use pandas because it's about 3 orders of magnitude faster to turn into JSON     32 _VSCODE_rows = _VSCODE_df.iloc[_VSCODE_startRow:_VSCODE_endRow]---> 33 _VSCODE_result = _VSCODE_pd_json.to_json(None, _VSCODE_rows, orient='table', date_format='iso')     34 print(_VSCODE_result)     35 
/usr/lib/python3.7/site-packages/pandas/io/json/json.py in to_json(path_or_buf, obj, orient, date_format, double_precision, force_ascii, date_unit, default_handler, lines, compression, index)     60         double_precision=double_precision, ensure_ascii=force_ascii,     61         date_unit=date_unit, default_handler=default_handler,---> 62         index=index).write()     63      64     if lines:
/usr/lib/python3.7/site-packages/pandas/io/json/json.py in __init__(self, obj, orient, date_format, double_precision, ensure_ascii, date_unit, index, default_handler)    184             raise ValueError(msg)    185 --> 186         self.schema = build_table_schema(obj, index=self.index)    187     188         # NotImplementd on a column MultiIndex
/usr/lib/python3.7/site-packages/pandas/io/json/table_schema.py in build_table_schema(data, index, primary_key, version)    242     if data.ndim > 1:    243         for column, s in data.iteritems():--> 244             fields.append(convert_pandas_type_to_json_field(s))    245     else:    246         fields.append(convert_pandas_type_to_json_field(data))
/usr/lib/python3.7/site-packages/pandas/io/json/table_schema.py in convert_pandas_type_to_json_field(arr, dtype)    112     elif is_datetime64tz_dtype(arr):    113         if hasattr(arr, 'dt'):--> 114             field['tz'] = arr.dt.tz.zone    115         else:    116             field['tz'] = arr.tz.zone
AttributeError: 'datetime.timezone' object has no attribute 'zone' (at t (/home/martin/.vscode-insiders/extensions/ms-python.python-2019.5.18875/out/client/extension.js:1:16618))
t.log @ console.ts:134
$logExtensionHostMessage @ mainThreadConsole.ts:38
_doInvokeHandler @ rpcProtocol.ts:394
_invokeHandler @ rpcProtocol.ts:379
_receiveRequest @ rpcProtocol.ts:299
_receiveOneMessage @ rpcProtocol.ts:226
_protocol.onMessage.e @ rpcProtocol.ts:101
fire @ event.ts:558
a @ ipc.net.ts:421
e @ ipc.net.ts:428
fire @ event.ts:558
_receiveMessage @ ipc.net.ts:715
S._socketDisposables.push._socketReader.onMessage.e @ ipc.net.ts:578
fire @ event.ts:558
acceptChunk @ ipc.net.ts:236
_register._socket.onData.e @ ipc.net.ts:197
t @ ipc.net.ts:28
emit @ events.js:182
addChunk @ _stream_readable.js:283
readableAddChunk @ _stream_readable.js:264
Readable.push @ _stream_readable.js:219
onStreamRead @ internal/stream_base_commons.js:94
console.ts:134 [Extension Host] Error Python Extension: 2019-06-22 16:53:19: [Error: Failure during variable extraction:
---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
<ipython-input-4-e695ca9d874d> in <module>     31 # Turn into JSON using pandas. We use pandas because it's about 3 orders of magnitude faster to turn into JSON     32 _VSCODE_rows = _VSCODE_df.iloc[_VSCODE_startRow:_VSCODE_endRow]---> 33 _VSCODE_result = _VSCODE_pd_json.to_json(None, _VSCODE_rows, orient='table', date_format='iso')     34 print(_VSCODE_result)     35 
/usr/lib/python3.7/site-packages/pandas/io/json/json.py in to_json(path_or_buf, obj, orient, date_format, double_precision, force_ascii, date_unit, default_handler, lines, compression, index)     60         double_precision=double_precision, ensure_ascii=force_ascii,     61         date_unit=date_unit, default_handler=default_handler,---> 62         index=index).write()     63      64     if lines:
/usr/lib/python3.7/site-packages/pandas/io/json/json.py in __init__(self, obj, orient, date_format, double_precision, ensure_ascii, date_unit, index, default_handler)    184             raise ValueError(msg)    185 --> 186         self.schema = build_table_schema(obj, index=self.index)    187     188         # NotImplementd on a column MultiIndex
/usr/lib/python3.7/site-packages/pandas/io/json/table_schema.py in build_table_schema(data, index, primary_key, version)    242     if data.ndim > 1:    243         for column, s in data.iteritems():--> 244             fields.append(convert_pandas_type_to_json_field(s))    245     else:    246         fields.append(convert_pandas_type_to_json_field(data))
/usr/lib/python3.7/site-packages/pandas/io/json/table_schema.py in convert_pandas_type_to_json_field(arr, dtype)    112     elif is_datetime64tz_dtype(arr):    113         if hasattr(arr, 'dt'):--> 114             field['tz'] = arr.dt.tz.zone    115         else:    116             field['tz'] = arr.tz.zone
AttributeError: 'datetime.timezone' object has no attribute 'zone'	at g.deserializeJupyterResult (/home/martin/.vscode-insiders/extensions/ms-python.python-2019.5.18875/out/client/extension.js:83:558667)	at g.runScript (/home/martin/.vscode-insiders/extensions/ms-python.python-2019.5.18875/out/client/extension.js:83:558235)] (at t (/home/martin/.vscode-insiders/extensions/ms-python.python-2019.5.18875/out/client/extension.js:1:16618))
t.log @ console.ts:134
$logExtensionHostMessage @ mainThreadConsole.ts:38
_doInvokeHandler @ rpcProtocol.ts:394
_invokeHandler @ rpcProtocol.ts:379
_receiveRequest @ rpcProtocol.ts:299
_receiveOneMessage @ rpcProtocol.ts:226
_protocol.onMessage.e @ rpcProtocol.ts:101
fire @ event.ts:558
a @ ipc.net.ts:421
e @ ipc.net.ts:428
fire @ event.ts:558
_receiveMessage @ ipc.net.ts:715
S._socketDisposables.push._socketReader.onMessage.e @ ipc.net.ts:578
fire @ event.ts:558
acceptChunk @ ipc.net.ts:236
_register._socket.onData.e @ ipc.net.ts:197
t @ ipc.net.ts:28
emit @ events.js:182
addChunk @ _stream_readable.js:283
readableAddChunk @ _stream_readable.js:264
Readable.push @ _stream_readable.js:219
onStreamRead @ internal/stream_base_commons.js:94

[ronglums]

@thierer Sorry for the confusion. I was referring to Rich’s comment above “We might be able to work around it using the hack described in the bug”, however we expect this hack will have a performance hit - therefore if we went that route, we’d also need to prompt a message saying that this could be slow.

[greazer]

Thanks for the feedback! However, we don’t have plans on adding this functionality at this time.