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NameError: name 'self' is not defined
...t function define-time, but self is an argument only available at function call time. Thus arguments in the argument list cannot refer each other.
It's a common pattern to default an argument to None and add a test for that in code:
def p(self, b=None):
if b is None:
b = self.a
pri...
What does the “-U” option stand for in pip install -U
Despite a ton of Googling, I can't find any docs for pip's command line options/arguments. What does pip install -U mean? Does anyone have a link to a list of pip's options and arguments?
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How do I select child elements of any depth using XPath?
...Simply use:
//form[@id='myform']//input[@type='submit']
The // shortcut can also be used inside an expression.
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What predefined macro can I use to detect clang?
I'm trying to detect the compiler used to compile my source code. I can easily find predefined macros to check for MSVC or GCC (see http://predef.sourceforge.net/ for example), but I cannot find any macro to check for clang.
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Is it safe to assume strict comparison in a JavaScript switch statement?
I have a variable that can either be boolean false , or an integer (including 0). I want to put it in a switch statement like:
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Stream.Seek(0, SeekOrigin.Begin) or Position = 0
...when setting a relative position. Both are provided for convenience so you can choose one that fits the style and readability of your code. Accessing Position requires the stream be seekable so they're safely interchangeable.
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Remove the error indicator from a previously-validated EditText widget
...tView = ...; // fetch it as appropriate
textView.setError(null);
}
Because as mentioned in the documentation:
If the error is null, the error message and icon will be cleared.
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How do I ignore the authenticity token for specific actions in Rails?
...authenticity_token
For previous versions:
For individual actions, you can do:
protect_from_forgery :only => [:update, :destroy, :create]
#or
protect_from_forgery :except => [:update, :destroy, :create]
For an entire controller, you can do:
skip_before_action :verify_authenticity_token...
Adding services after container has been built
...
Yes you can, using the Update method on ContainerBuilder:
var newBuilder = new ContainerBuilder();
newBuilder.Register...;
newBuilder.Update(existingContainer);
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git - diff of current changes before committing
...2 (most chapters; it explains the model behind Git and answers most of typical questions)
and then immediately http://gitready.com/ (usage tips).
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