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Multiple Indexes vs Multi-Column Indexes
...reused.
e.g. imagine you search a table on three columns
state, county, zip.
you sometimes search by state only.
you sometimes search by state and county.
you frequently search by state, county, zip.
Then an index with state, county, zip. will be used in all three of these searches.
If yo...
How to get first element in a list of tuples?
...
Use the zip function to decouple elements:
>>> inpt = [(1, u'abc'), (2, u'def')]
>>> unzipped = zip(*inpt)
>>> print unzipped
[(1, 2), (u'abc', u'def')]
>>> print list(unzipped[0])
[1, 2]
Edit (...
Compression/Decompression string with C#
...) != 0) {
dest.Write(bytes, 0, cnt);
}
}
public static byte[] Zip(string str) {
var bytes = Encoding.UTF8.GetBytes(str);
using (var msi = new MemoryStream(bytes))
using (var mso = new MemoryStream()) {
using (var gs = new GZipStream(mso, CompressionMode.Compress)) {...
Alarm 闹钟扩展 · App Inventor 2 中文网
...
Alarm 闹钟扩展
下载
.aix拓展文件：
de.ullisroboterseite.ursai2alarm.aix
.aia示例文件：
UrsAlarmTest.aia
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1.0 (2021-04-26)
初...
Executing a command stored in a variable from PowerShell
...r me. Assume
7z.exe is in the system path.
$cmd = '7z.exe'
$prm = 'a', '-tzip', 'c:\temp\with space\test1.zip', 'C:\TEMP\with space\changelog'
& $cmd $prm
If the command is known (7z.exe) and only parameters are variable then this will do
$prm = 'a', '-tzip', 'c:\temp\with space\test1.zip',...
Pandas convert dataframe to array of tuples
...w that a dedicated feature exists). BTW, if you want normal tuples in your zip iterator (instead of namedtuples), then call: data_set.itertuples(index=False, name=None)
– Axel
Oct 25 '17 at 9:47
...
How to run functions in parallel?
...both to finish at critical synchronization points using Process.join like @aix's answer mentions.
This is better than time.sleep(10) because you can't guarantee exact timings. With explicitly waiting, you're saying that the functions must be done executing that step before moving to the next, inst...
SQL query for finding records where count > 1
... named PAYMENT . Within this table I have a user ID, an account number, a ZIP code and a date. I would like to find all records for all users that have more than one payment per day with the same account number.
...
How to loop through all but the last item of a list?
... easiest way to compare the sequence item with the following:
for i, j in zip(a, a[1:]):
# compare i (the current) to j (the following)
share
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improve this answer
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f...
string sanitizer for filename
...ive characters
$filename = preg_replace(array(
// "file name.zip" becomes "file-name.zip"
'/ +/',
// "file___name.zip" becomes "file-name.zip"
'/_+/',
// "file---name.zip" becomes "file-name.zip"
'/-+/'
), '-', $filename);
$filename = pre...