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Fastest way to get the first object from a queryset in django?
...'m pretty sure you'll even see this add LIMIT 1 to the query, and I don't know that you can do any better than this. However, internally __nonzero__ in QuerySet is implemented as try: iter(self).next() except StopIteration: return false... so it doesn't escape the exception.
–...
Reading a huge .csv file
...opwhile(lambda r: r[3] != criterion, datareader))
return
You can now loop over getstuff() directly. Do the same in getdata():
def getdata(filename, criteria):
for criterion in criteria:
for row in getstuff(filename, criterion):
yield row
Now loop directly over ge...
Python time measure function
...o make it a function, then you can choose the second method.
For example, now you have
images = get_images()
bigImage = ImagePacker.pack(images, width=4096)
drawer.draw(bigImage)
Now you want to time the bigImage = ... line. If you change it to a function, it will be:
images = get_images()
bitI...
How can I time a code segment for testing performance with Pythons timeit?
...
update: time.clock() is now deprecated. You should now use time.time(). Actually, since version 3.3, the best option would be time.perf_counter()
– Madlozoz
Jul 10 '16 at 9:57
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Equivalent to 'app.config' for a library (DLL)
...h name: DllName.dll.config, otherwise the below code won't work properly.
Now to read from this file have such function:
string GetAppSetting(Configuration config, string key)
{
KeyValueConfigurationElement element = config.AppSettings.Settings[key];
if (element != null)
{
stri...
string sanitizer for filename
...at will sanitize a string and make it ready to use for a filename. Anyone know of a handy one?
17 Answers
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C# binary literals
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@D.Singh I see it on the C# 7 list now. github.com/dotnet/roslyn/issues/2136
– Danation
Jul 24 '15 at 20:03
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Elastic Search: how to see the indexed data
...utocomplete.
Note: Sense was originally a standalone chrome plugin but is now part of the Marvel project.
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Placeholder in UITextView
My application uses an UITextView . Now I want the UITextView to have a placeholder similar to the one you can set for an UITextField .
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In node.JS how can I get the path of a module I have loaded via require that is *not* mine (i.e. in
...wer was the best answer, until Node.js ESM and the exports field came out.
Now that Node supports packages with an exports field that by default will prevent files like package.json from being resolvable unless the package author explicitly decides to expose them, the trick in Jason's answer will fa...