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Get average color of image via Javascript
...ur browser if you try it in the client. I have been working on refactoring my execution to:
- store results in a lookup table for future use in the iteration over each pixel.
- to divide large images into grids of 20px 20px for localized dominance.
- to use the euclidean distance between x1y1 ...
Why is there no tuple comprehension in Python?
...ch of a win vs just using tuple(obj[item] for item in items) directly. In my case I was embedding this into a list comprehension to make a list of tuple records. If I need to do this repeatedly throughout the code then itemgetter looks great. Perhaps itemgetter would be more idiomatic either way?...
A complete solution to LOCALLY validate an in-app receipts and bundle receipts on iOS 7
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Here's a walkthrough of how I solved this in my in-app purchase library RMStore. I will explain how to verify a transaction, which includes verifying the whole receipt.
At a glance
Get the receipt and verify the transaction. If it fails, refresh the receipt and try ag...
What is the most effective way for float and double comparison?
...s-software.com/papers/comparingfloats/comparingfloats.htm and I can remove my dumb comments.
– artless noise
Mar 17 '13 at 19:16
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How can I drop all the tables in a PostgreSQL database?
...g2.ProgrammingError'> no schema has been selected to create in
So to my mind the fully correct answer is:
DROP SCHEMA public CASCADE;
CREATE SCHEMA public;
GRANT ALL ON SCHEMA public TO postgres;
GRANT ALL ON SCHEMA public TO public;
COMMENT ON SCHEMA public IS 'standard public schema';
Als...
Check number of arguments passed to a Bash script
I would like my Bash script to print an error message if the required argument count is not met.
10 Answers
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Difference between map, applymap and apply methods in Pandas
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It's on page 129 in my copy for some reason. There's no label for second edition or anything.
– Jody
Jan 26 '16 at 21:34
1
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In a Django form, how do I make a field readonly (or disabled) so that it cannot be edited?
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Correct answer. My solution class MyChangeForm(forms.ModelForm): def __init__(self, *args, **kwargs): super(MyChangeForm, self).__init__(*args, **kwargs) self.fields['my_field'].disabled = True
–...
Why are empty catch blocks a bad idea? [closed]
...nd is not abused as control flow (although this is a more specific case of my first point).
– Boris B.
Sep 12 '13 at 8:34
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show 7 more comm...
JavaScript: How to find out if the user browser is Chrome?
... the new Opera 30. So you must check if OPR is in the userAgent. I updated my condition above to account for this new change in Opera 30, since it uses same render engine as Google Chrome.
UPDATE 10/13/2015 - addition for IE check
Added check for IE Edge due to it outputting true for window.chrome...