Files
catalyst/zipline/utils/sqlite_utils.py
T
Eddie Hebert 16fd6681a6 ENH: Rewrite of Zipline to use lazy access pattern
More documentation to follow in release notes.

Based on lazy-mainline branch, see for more details.

Also-By: Jean Bredeche <jean@quantopian.com>
Also-By: Andrew Liang <aliang@quantopian.com>
Also-By: Abhijeet Kalyan <akalyan@quantopian.com>
2016-04-04 16:12:58 -04:00

25 lines
828 B
Python

# Copyright 2016 Quantopian, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from six.moves import range
SQLITE_MAX_VARIABLE_NUMBER = 998
def group_into_chunks(items, chunk_size=SQLITE_MAX_VARIABLE_NUMBER):
items = list(items)
return [items[x:x+chunk_size]
for x in range(0, len(items), chunk_size)]