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MySQL - force not to use cache for testing speed of query
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This will stop MySQL caching the results, however be aware that other OS and disk caches may also impact performance. These are harder to get around.
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What is the official “preferred” way to install pip and virtualenv systemwide?
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If you can install the latest Python (2.7.9 and up) Pip is now bundled with it.
See: https://docs.python.org/2.7//installing/index.html
If not :
Update (from the release notes):
Beginning with v1.5.1, pip does not require setuptools prior to running get-pip.py. Ad...
Windows can't find the file on subprocess.call()
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When the command is a shell built-in, add a 'shell=True' to the call.
E.g. for dir you would type:
import subprocess
subprocess.call('dir', shell=True)
To quote from the documentation:
The only time you need to specify shell=True ...
Pandas: drop a level from a multi-level column index?
... If the index you are trying to drop is on the left (row) side and not the top (column) side, you can change "columns" to "index" and use the same method: >>> df.index = df.index.droplevel(1)
– Idodo
Nov 28 '18 at 12:13
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Converting pixels to dp
I have created my application with the height and width given in pixels for a Pantech device whose resolution is 480x800 .
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sudo echo “something” >> /etc/privilegedFile doesn't work
...ev/null
Remember about the (-a/--append) flag!
Just tee works like > and will overwrite your file. tee -a works like >> and will write at the end of the file.
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Ensuring json keys are lowercase in .NET
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@Anzeo I have not tried to do that myself, and I did not find any information about that in the documentation. A solution would be to wrap JsonConvert.SerializeObject in your own class. See my update.
– alexn
Jun 21 '12 at 7:48
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Returning IEnumerable vs. IQueryable
...ecute SQL to only select gold customers. The following code, on the other hand, will execute the original query in the database, then filtering out the non-gold customers in the memory:
IEnumerable<Customer> custs = ...;
// Later on...
var goldCustomers = custs.Where(c => c.IsGold);
This...
How to check that an element is in a std::set?
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this is specific for sets and maps. vectors, lists etc. don't have a find member function.
– wilhelmtell
Nov 9 '09 at 13:53
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How do we use runOnUiThread in Android?
I'm new to Android and I'm trying to use the UI-Thread, so I've written a simple test activity. But I think I've misunderstood something, because on clicking the button - the app does not respond anymore
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