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How can I convert an RGB image into grayscale in Python?

I'm trying to use matplotlib to read in an RGB image and convert it to grayscale. 12 Answers ...
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Why are Perl 5's function prototypes bad?

In another Stack Overflow question Leon Timmermans asserted: 4 Answers 4 ...
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What does android:layout_weight mean?

I don't understand how to use this attribute. Can anyone tell me more about it? 13 Answers ...
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Run Cron job every N minutes plus offset

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When to use Preorder, Postorder, and Inorder Binary Search Tree Traversal strategies

I realized recently that while having used BST's plenty in my life, I've never even contemplated using anything but Inorder traversal (while I am aware of and know how easy it is to adapt a program to use pre/post-order traversal). ...
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CSS3's border-radius property and border-collapse:collapse don't mix. How can I use border-radius to

Edit - Original Title: Is there an alternative way to achieve border-collapse:collapse in CSS (in order to have a collapsed, rounded corner table)? ...
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Checking if a variable is not nil and not zero in ruby

I am using the following code to check if a variable is not nil and not zero 18 Answers ...
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CSS content property: is it possible to insert HTML instead of Text?

Just wondering if it's possible somehow to make the CSS content property insert html code instead string on :before or :after an element like: ...
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Concept behind these four lines of tricky C code

Why does this code give the output C++Sucks ? What is the concept behind it? 9 Answers ...
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if A vs if A is not None:

Can I use: 12 Answers 12 ...