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SharedPreferences.onSharedPreferenceChangeListener not being called consistently
...eView. And that was because I listened to the Android Studio telling me to convert the listener to a local variable.
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pandas dataframe columns scaling with sklearn
...s a single feature or X.reshape(1, -1)
if it contains a single sample.
Converting your columns to numpy arrays should do the job (I prefer StandardScaler):
from sklearn.preprocessing import StandardScaler
scale = StandardScaler()
dfTest[['A','B','C']] = scale.fit_transform(dfTest[['A','B','C']...
Are nested try/except blocks in python a good programming practice?
...more complicated situations you may be right, but I think that when you're converting between exception types you often know that the details of the first exception don't matter to the outside user. That is, if __getattr__ raises an exception the bug is probably a typo in the attribute access, not a...
Reading/parsing Excel (xls) files with Python
...er of caveats is huge and the documentation is lacking and annoying. I ran into many weird bugs and gotchas, some of which took many hours to figure out.
UPDATE: For newer .xlsx files, the recommended library for reading and writing appears to be openpyxl (thanks, Ikar Pohorský).
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Why do my list item bullets overlap floating elements
...he only working remedy for this issue with Prince XML, a XHTML+CSS3 to PDF converter.
– Serge Stroobandt
Apr 4 '15 at 2:38
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Create the perfect JPA entity [closed]
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I'll try to answer several key points: this is from long Hibernate/ persistence experience including several major applications.
Entity Class: implement Serializable?
Keys needs to implement Serializable. Stuff that's going to go in the HttpSession, or be...
What is stdClass in PHP?
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True. I frequently use json_encode and json_decode to convert array to object to array, when necessary.
– pinkal vansia
Sep 5 '13 at 10:05
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Is PHP compiled or interpreted?
... the runtime engine.
The PHP compiler's job is to parse your PHP code and convert it into a form suitable for the runtime engine. Among its tasks:
Ignore comments
Resolve variables, function names, and so forth and create the symbol table
Construct the abstract syntax tree of your program
Write t...
Image Greyscale with CSS & re-color on mouse-over?
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Answered here: Convert an image to grayscale in HTML/CSS
You don't even need to use two images which sounds like a pain or an image manipulation library, you can do it with cross browser support (current versions) and just use CSS. This i...
img tag displays wrong orientation
...be to remove orientation metadata and flip the image. Imagemagick provides convert -autoorient function which will do this.
– saurabheights
Mar 9 '16 at 7:27
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