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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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Saving an Object (Data persistence)
...Error though! so does cPickle, pickle and hickle.
– Färid Alijani
Oct 10 '19 at 7:45
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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...
In Firebase, is there a way to get the number of children of a node without loading all the node dat
...baseio.com/posts/comments.json?shallow=true
– Osama Xäwãñz
Aug 12 '17 at 15:37
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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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Swift 编程语言入门教程 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...明一个函数。调用函数使用他的名字加上小括号中的参数列表。使用 -> 分隔参数的名字和返回值类型。
func greet(name: String, day: String) -> String {
return "Hello \(name), today is \(day)."
}
greet("Bob", "Tuesday")
Note
练习
去掉 day 参数...