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Django ModelForm: What is save(commit=False) used for?
..._type = "audio"
if attachment.filename.lower().endswith(('.csv','.dif','.ods','.xls','.tsv','.dat','.db','.xml','.xlsx','.xlr')):
attachment.file_type = "spreasheet"
if attachment.filename.lower().endswith(('.doc','.pdf','.rtf','.txt')):
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快速理解 高频对冲套利自动交易（程式化交易） - 更多技术 - 清泛网 - 专注...
...一天下午收盘后，整理好的，人工审核无误，软件里做了保存）。
我的电脑用了一款虚拟系统软件，可以很方便随时在两个系统里切换，所以，可以让软件同时做2个账户，相互不干扰。当然，如果，再用上VM等虚拟系统软件，...
使用App Inventor 2 控制物联网设备/低功耗蓝牙设备(BLE) · App Inventor 2 中文网
...这些连接以及设备发现和广告的规则由蓝牙通用访问配置文件 (GAP) 管理，这是所有 BLE 设备都必须遵守的强制性框架。
广播者与观察者 - 在这种情况下，嵌入在各种物联网设备中的传感器将定期向监听范围内的智能手机发送广...
How to create a temporary directory?
...UIT TERM
trap 'rm -rf "$TMPDIR"' EXIT
# Example use of TMPDIR:
for f in *.csv; do
cp "$f" "$TMPDIR"
# remove duplicate lines but keep order
perl -ne 'print if ++$k{$_}==1' "$TMPDIR/$f" > "$f"
done
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Git: How to remove file from historical commit?
...ilter "git rm --cached --ignore-unmatch PathRelativeRepositoryRoot/bigfile.csv" -- --all
After removing the big file, I was able to push my changes to github master.
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Bulk insert with SQLAlchemy ORM
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Compared to inserting the same data from CSV with \copy with psql (from the same client to the same server), I see a huge difference in performance on the server side resulting in about 10x more inserts/s. Apparently is bulk-loading using \copy (or COPY on the serve...
Serializing a list to JSON
...... stack, which provides a set of very fast serializers for Json, JSV and CSV.
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What is the recommended batch size for SqlBulkCopy?
...so spent some time looking into. I am looking to optimize importing large CSV files (16+ GB, 65+ million records, and growing) into a SQL Server 2005 database using a C# console application (.Net 2.0). As Jeremy has already pointed out, you will need to do some fine-tuning for your particular circ...
Python strptime() and timezones?
I have a CSV dumpfile from a Blackberry IPD backup, created using IPDDump.
The date/time strings in here look something like this
(where EST is an Australian time-zone):
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Reading a file line by line in Go
...ver a file, it would be trivial to first file, _ := os.Open("/path/to/file.csv") and then scan over the file handle: scanner := bufio.NewScanner(file)
– Evan Plumlee
Aug 18 '13 at 13:28
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