AttributeError: 'Timestamp' object has no attribute 'astype'

[anegrean]

Arctic Version

1.82.2

Arctic Store

TickStore

Platform and version

OS

NAME="Linux Mint" VERSION="21.3 (Virginia)" ID=linuxmint ID_LIKE="ubuntu debian"

MongoDB

db version v6.0.13 Build Info: { "version": "6.0.13", "gitVersion": "3b13907f9bdf6bd3264d67140d6c215d51bbd20c", "openSSLVersion": "OpenSSL 3.0.2 15 Mar 2022", "modules": [], "allocator": "tcmalloc", "environment": { "distmod": "ubuntu2204", "distarch": "x86_64", "target_arch": "x86_64" } }

Python

Python 3.10

Description of problem and/or code sample that reproduces the issue

AttributeError: 'Timestamp' object has no attribute 'astype'

Code

import pandas as pd from datetime import datetime as dt

from arctic import Arctic, TICK_STORE from arctic.date._mktz import mktz

db = Arctic('localhost') db.delete_library('temp') db.initialize_library('temp', lib_type=TICK_STORE) tickstore_lib = db['temp']

data = [{'A': 120, 'D': 1}, {'A': 122, 'B': 2.0}, {'A': 3, 'B': 3.0, 'D': 1}] tick_index = [dt(2013, 6, 1, 12, 00, tzinfo=mktz('UTC')), dt(2013, 6, 1, 11, 00, tzinfo=mktz('UTC')), # Out-of-order dt(2013, 6, 1, 13, 00, tzinfo=mktz('UTC'))]

data = pd.DataFrame(data, index=tick_index)

tickstore_lib._chunk_size = 3 tickstore_lib.write('SYM', data) print(tickstore_lib.read('SYM', columns=None).index)

Traceback

---

AttributeError Traceback (most recent call last) Cell In[73], line 21 18 data = pd.DataFrame(data, index=tick_index) 20 tickstore_lib._chunk_size = 3 ---> 21 tickstore_lib.write('SYM', data) 22 print(tickstore_lib.read('SYM', columns=None).index)

File ~/miniforge3/envs/trading2/lib/python3.10/site-packages/arctic/tickstore/tickstore.py:600, in TickStore.write(self, symbol, data, initial_image, metadata) 597 self._assert_nonoverlapping_data(symbol, to_dt(start), to_dt(end)) 599 if pandas: --> 600 buckets = self._pandas_to_buckets(data, symbol, initial_image) 601 else: 602 buckets = self._to_buckets(data, symbol, initial_image)

File ~/miniforge3/envs/trading2/lib/python3.10/site-packages/arctic/tickstore/tickstore.py:621, in TickStore._pandas_to_buckets(self, x, symbol, initial_image) 619 rtn = [] 620 for i in range(0, len(x), self._chunk_size): --> 621 bucket, initial_image = TickStore._pandas_to_bucket(x[i:i + self._chunk_size], symbol, initial_image) 622 rtn.append(bucket) 623 return rtn

File ~/miniforge3/envs/trading2/lib/python3.10/site-packages/arctic/tickstore/tickstore.py:729, in TickStore._pandas_to_bucket(df, symbol, initial_image) 721 col_data = { 722 DATA: Binary(lz4_compressHC(array.tobytes())), 723 ROWMASK: rowmask, 724 DTYPE: TickStore._str_dtype(array.dtype), 725 } 726 rtn[COLUMNS][col] = col_data 727 rtn[INDEX] = Binary( 728 lz4_compressHC(np.concatenate( --> 729 ([recs[index_name][0].astype('datetime64[ms]').view('uint64')], 730 np.diff( 731 recs[index_name].astype('datetime64[ms]').view('uint64')))).tobytes())) 732 return rtn, final_image

AttributeError: 'Timestamp' object has no attribute 'astype'