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Reverse / invert a dictionary mapping
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For Python 2.7.x
inv_map = {v: k for k, v in my_map.iteritems()}
For Python 3+:
inv_map = {v: k for k, v in my_map.items()}
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How to redirect to a 404 in Rails?
...'d like to 'fake' a 404 page in Rails. In PHP, I would just send a header with the error code as such:
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How do you add a Dictionary of items into another Dictionary
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edited Jul 14 '17 at 18:23
Dima
22.7k55 gold badges4949 silver badges8181 bronze badges
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Remove last item from array
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Use splice(startPosition, deleteCount)
array.splice(-1,1)
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How to set child process' environment variable in Makefile
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edited Feb 2 at 22:56
rado
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django admin - add custom form fields that are not part of the model
I have a model registered in the admin site. One of its fields is a long string expression. I'd like to add custom form fields to the add/update page of this model in the admin that based on these fields values I will build the long string expression and save it in the relevant model field.
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“Code too large” compilation error in Java
Is there any maximum size for code in Java? I wrote a function with more than 10,000 lines. Actually, each line assigns a value to an array variable.
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How to send multiple data fields via Ajax? [closed]
I'm stuck: I'm trying to submit a form using AJAX, but I can't find a way to send multiple data fields via my AJAX call.
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Literal suffix for byte in .NET?
...hort way like floats or doubles? I mean like 5f and 5d . Sure I could write byte x = 5 , but that's a bit inconsequential if you use var for local variables.
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How to close current tab in a browser window?
... link on a webpage that would close the currently active tab in a browser without closing other tabs in the browser. When the user clicks the close link, an alert message should appear asking the user to confirm with two buttons, "YES" and "NO". If the user clicks "YES", close that page and If "NO...