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Check if a given key already exists in a dictionary
...for any key you can either use dict.setdefault() repeatedly or defaultdict from the collections module, like so:
from collections import defaultdict
d = defaultdict(int)
for i in range(100):
d[i % 10] += 1
but in general, the in keyword is the best way to do it.
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Autolayout - intrinsic size of UIButton does not include title insets
...t all in Interface Builder as follows.
Intrinsic button width is derived from the title width plus the icon width plus the left and right content edge insets.
If a button has both an image and text, they’re centered as a group, with no padding between.
If you add a left content inset, it’s cal...
What are WSGI and CGI in plain English?
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From a totally step-back point of view, Blankman, here is my "Intro Page" for Web Services Gateway Interface:
PART ONE: WEB SERVERS
Web servers serve up responses. They sit around, waiting patiently, and then with no warnin...
Git pre-push hooks
...er push in another thread, if the first one push times out, the second one from another thread works for me. If either first and second succeeds, then the first pushes changes, and the second pushes nothing. The trick is that i had some argument added, which bypasses unit tests(which was used for th...
What is the difference between Forking and Cloning on GitHub?
...he two projects (and other forks).
You can still request that people pull from your cloned repository, even if you don't use fork -- but you'd have to deal with making it publicly available yourself. Or send the developers patches (see git format-patch) that they can apply to their trees.
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How do I reference a Django settings variable in my models.py?
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Try with this: from django.conf import settings then
settings.VARIABLE to access that variable.
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When is the thread pool used?
...en churning on without it in the meantime. All of this is abstracted away from you, the node developer, and some of it is abstracted away from the module developers through the use of libuv.
As pointed out by Denis Dollfus in the comments (from this answer to a similar question), the strategy used...
How to delete the contents of a folder?
... symbolic link to a directory). If ignore_errors is true, errors resulting from failed removals will be ignored; if false or omitted, such errors are handled by calling a handler specified by onerror or, if that is omitted, they raise an exception.
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Error handling in getJSON calls
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Here's my addition.
From http://www.learnjavascript.co.uk/jq/reference/ajax/getjson.html and the official source
"The jqXHR.success(), jqXHR.error(), and jqXHR.complete() callback
methods introduced in jQuery 1.5 are deprecated as of jQuery 1.8...
Difference between VARCHAR and TEXT in MySQL [duplicate]
...CHAR does not provide any noticeable performance improvement. (This comes from an old wives tale about MyISAM tables; even there it was of dubious validity.)
– Rick James
Jan 27 '19 at 23:39
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