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Is there a MySQL option/feature to track history of changes to records?
...ATE TABLE MyDB.data_history LIKE MyDB.data;
ALTER TABLE MyDB.data_history MODIFY COLUMN primary_key_column int(11) NOT NULL,
DROP PRIMARY KEY, ENGINE = MyISAM, ADD action VARCHAR(8) DEFAULT 'insert' FIRST,
ADD revision INT(6) NOT NULL AUTO_INCREMENT AFTER action,
ADD dt_datetime DATETIME...
How do I run all Python unit tests in a directory?
I have a directory that contains my Python unit tests. Each unit test module is of the form test_*.py . I am attempting to make a file called all_test.py that will, you guessed it, run all files in the aforementioned test form and return the result. I have tried two methods so far; both have fail...
FFMPEG (libx264) “height not divisible by 2”
...istorts the picture. If you're worried about filtering speed, use scale=iw+mod(iw,2):ih+mod(ih,2):flags=neighbor. This can only increase each dimension by 1, if needed, and will duplicate the last row/column.
– Gyan
Feb 4 '19 at 15:59
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Multiple linear regression in Python
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sklearn.linear_model.LinearRegression will do it:
from sklearn import linear_model
clf = linear_model.LinearRegression()
clf.fit([[getattr(t, 'x%d' % i) for i in range(1, 8)] for t in texts],
[t.y for t in texts])
Then clf.coef_ ...
How to render a DateTime in a specific format in ASP.NET MVC 3?
If I have in my model class a property of type DateTime how can I render it in a specific format - for example in the format which ToLongDateString() returns?
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Why do people say there is modulo bias when using a random number generator?
...one here which will hopefully help people understand why exactly there is "modulo bias" when using a random number generator, like rand() in C++.
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How to import a module given the full path?
How can I load a Python module given its full path? Note that the file can be anywhere in the filesystem, as it is a configuration option.
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How does this print “hello world”?
..., then we can turn the 6th bit on and that should be all.
Here is what the mod 95 part comes to play, space is 1011111₂ = 95₁₀, using the mod
operation (l & 31 | 64) % 95) only space goes back to 0, and after this, the code turns the 6th bit on by adding 32₁₀ = 100000₂
to the previou...
How to pass arguments to a Button command in Tkinter?
...ambda (note there's also some implementation of currying in the functional module, so you can use that too):
button = Tk.Button(master=frame, text='press', command= lambda: action(someNumber))
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Does Django scale? [closed]
...abblo.com: 44k daily visits, see Ned Batchelder's posts Infrastructure for modern web sites.
chesspark.com: Alexa rank about 179k.
pownce.com (no longer active): alexa rank about 65k.
Mike Malone of Pownce, in his EuroDjangoCon presentation on Scaling Django Web Apps says "hundreds of hits per secon...