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What is the difference between old style and new style classes in Python?

...(x) is always <type 'instance'>. This reflects the fact that all old-style instances, independently of their class, are implemented with a single built-in type, called instance. New-style classes were introduced in Python 2.2 to unify the concepts of class and type. A new-s...
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Length of generator output [duplicate]

... Fibonacci numbers. You can get as many Fibonacci numbers as you want by calling next(). If you really need to know the number of items there are, then you can't iterate through them linearly one time anyway, so just use a different data structure such as a regular list. ...
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Getting Django admin url for an object

...e was an easy way to get the admin url of an object, and I had written a small filter that I'd use like this: <a href="{{ object|admin_url }}" .... > ... </a> ...
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How can I quantify difference between two images?

...s on the first image to edges on the second. Is there noise in the image? All sensors pollute the image with some amount of noise. Low-cost sensors have more noise. You may wish to apply some noise reduction before you compare images. Blur is the most simple (but not the best) approach here. What k...
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Any way to delete in vim without overwriting your last yank? [duplicate]

... This is probably the simplest but effective solution! I've found that all I need is the most-recent yank in 99% cases. And this trick just scratches the itch! – John Chain Oct 14 '13 at 20:40 ...
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How do I find the location of my Python site-packages directory?

...ib"])' The per user site-packages directory (PEP 370) is where Python installs your local packages: python -m site --user-site If this points to a non-existing directory check the exit status of Python and see python -m site --help for explanations. Hint: Running pip list --user or pip freeze -...
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Why use def main()? [duplicate]

...ink I still have something else to add. Reasons to have that if statement calling main() (in no particular order): Other languages (like C and Java) have a main() function that is called when the program is executed. Using this if, we can make Python behave like them, which feels more familiar for ...
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What is the difference between “px”, “dip”, “dp” and “sp”?

...lems with dp while everything works fine with dip – DallaRosa Jul 4 '11 at 6:07 255 One note abou...
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Google Chrome Extensions - Can't load local images with CSS

...ion that uses the content script feature to modify a website. More specifically, the background-image of said website. 8 ...
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How to step through Python code to help debug issues?

... Yes! There's a Python debugger called pdb just for doing that! You can launch a Python program through pdb by using pdb myscript.py or python -m pdb myscript.py. There are a few commands you can then issue, which are documented on the pdb page. Some usef...