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How can I convert an RGB image into grayscale in Python?
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SciPy's image I/O is literally PIL/Pillow. Hence, testing SciPy is effectively retesting PIL/Pillow with negligible overhead introduced by SciPy's wrapper functions. It would have been much more useful to substitute OpenCV (which does not leverage PIL...
Why the switch statement cannot be applied on strings?
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The reason why has to do with the type system. C/C++ doesn't really support strings as a type. It does support the idea of a constant char array but it doesn't really fully understand the notion of a string.
In order to generate the code for a switch statement the compiler must under...
Using R to download zipped data file, extract, and import data
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Zip archives are actually more a 'filesystem' with content metadata etc. See help(unzip) for details. So to do what you sketch out above you need to
Create a temp. file name (eg tempfile())
Use download.file() to fetch the file into the temp....
How to set the authorization header using curl
... send authentication for OAuth 2:
curl -H "Authorization: OAuth <ACCESS_TOKEN>" http://www.example.com
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How to install JSTL? The absolute uri: http://java.sun.com/jstl/core cannot be resolved
... deployed with this application
That URI is for JSTL 1.0, but you're actually using JSTL 1.2 which uses URIs with an additional /jsp path (because JSTL, who invented EL expressions, was since version 1.1 integrated as part of JSP in order to share/reuse the EL logic in plain JSP too).
So, fix the...
How can I perform a `git pull` without re-entering my SSH password?
...use the key!
Neither do I! Thankfully, there’s a nifty little tool called
ssh-agent that can save your passphrase securely so you don’t have
to re-enter it. If you’re on OSX Leopard or later your keys can be
saved in the system’s keychain to make your life even easier. Most
linu...
How to wait for all goroutines to finish without using time.Sleep?
This code selects all xml files in the same folder, as the invoked executable and asynchronously applies processing to each result in the callback method (in the example below, just the name of the file is printed out).
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GitHub clone from pull request?
...sing the -b option and for pull request:
git clone https://github.com/user_name/repo_name.git -b feature/pull_request_name dir_name
In your case, the branch you want to clone is the source branch of the pull request (feature/mongoose-support):
git clone https://github.com/berstend/frappe.git -b ...
Django Model - Case-insensitive Query / Filtering
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I solved it like this:
MyClass.objects.filter(name__iexact=my_parameter)
There is even a way to use it for substring search:
MyClass.objects.filter(name__icontains=my_parameter)
There's a link to the documentation.
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Why do we need the “finally” clause in Python?
I am not sure why we need finally in try...except...finally statements. In my opinion, this code block
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