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Given an RGB value, how do I create a tint (or shade)?
... RGB. However, RGB colors specified in documents or encoded in images and video are not likely to be in linear RGB, in which case a so-called inverse transfer function needs to be applied to each of the RGB color's components. This function varies with the RGB color space. For example, in the sRGB c...
What kind of virtual machine is BEAM (the Erlang VM)?
...t like any other OS process. Like other OS processes it uses resources provided by the OS like memory, i/o devices, etc. So everything specifically Erlang like processes/fault-tolerance/applications/etc is handled inside the Erlang VM process.
– rvirding
Oct 20...
What exactly is Java EE?
...EE is indeed an abstract specification. Anybody is open to develop and provide a working implementation of the specification. The concrete implementations are the so-called application servers, like WildFly, TomEE, GlassFish, Liberty, WebLogic, etc. There are also servlet containers which implement ...
Differences between Intent and PendingIntent
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Intent
An Android Intent is an object carrying an intent, i.e. a message from one component to another component either inside or outside of the application. Intents can communicate messages among any of the three core components of an appl...
How to limit the maximum value of a numeric field in a Django model?
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In this case, you could 'inherit' from the built-in IntegerField and override its validation logic.
The more I think about this, I realize how useful this would be for many Django apps. Perhaps a IntegerRangeField type could be submitted as a patch for the Django devs to consider adding to trunk.
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Using forked package import in Go
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oh, but "master" did not work for me. I had to write v0.0.1 or some specific version there.
– Andrew Arrow
Oct 27 '19 at 6:31
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how to mysqldump remote db from local machine
...local server
Remore server
CREATE USER 'backup_remote_2'@'192.168.0.102' IDENTIFIED WITH caching_sha2_password BY '3333333' REQUIRE SSL;
GRANT ALL PRIVILEGES ON *.* TO 'backup_remote_2'@'192.168.0.102';
FLUSH PRIVILEGES;
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Local server
sudo /usr/local/mysql/bin/mysqldump \
--databases test_...
Convert columns to string in Pandas
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One way to convert to string is to use astype:
total_rows['ColumnID'] = total_rows['ColumnID'].astype(str)
However, perhaps you are looking for the to_json function, which will convert keys to valid json (and therefore your keys to strings):
In [11]: df = pd.DataFrame([['A', 2], ['A', 4...
ExecuteReader requires an open and available Connection. The connection's current state is Connectin
...ADO.NET functionality into a DB-Class(me too 10 years ago). Mostly they decide to use static/shared objects since it seems to be faster than to create a new object for any action.
That is neither a good idea in terms of peformance nor in terms of fail-safety.
Don't poach on the Connection-Pool's t...
How to validate an email address in PHP
I have this function to validate an email addresses:
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