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Why is there “data” and “newtype” in Haskell? [duplicate]
... was True or False:
helloMe :: CoolBool -> String
helloMe (CoolBool _) = "hello"
Instead of applying this function to a normal CoolBool, let's throw it a curveball and apply it to undefined!
ghci> helloMe undefined
"*** Exception: Prelude.undefined
Yikes! An exception! No...
ReSharper - force curly braces around single line
... formatting (see details at http://www.jetbrains.com/resharper/webhelp/Code_Cleanup__Index.html), so use the feature wisely.
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Extract subset of key-value pairs from Python dictionary object?
...
A bit shorter, at least:
wanted_keys = ['l', 'm', 'n'] # The keys you want
dict((k, bigdict[k]) for k in wanted_keys if k in bigdict)
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Default value in Go's method
...er at the end
// a is required, b is optional.
// Only the first value in b_optional will be used.
func Concat2(a string, b_optional ...int) string {
b := 5
if len(b_optional) > 0 {
b = b_optional[0]
}
return fmt.Sprintf("%s%d", a, b)
}
**Option 3:** A config struct
// A declarativ...
Print a string as hex bytes?
...ex (convert str to bytes by calling .encode()).
– mic_e
May 8 '15 at 12:53
8
...
ImportError: no module named win32api
...n installation for win32api and you should find win32api.pyd under ${PYTHON_HOME}\Lib\site-packages\win32.
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Programmatically saving image to Django ImageField
...actually resides in a method of my model
result = urllib.urlretrieve(image_url) # image_url is a URL to an image
# self.photo is the ImageField
self.photo.save(
os.path.basename(self.url),
File(open(result[0], 'rb'))
)
self.save()
That's a bit confusing because it's pulled out of my...
How do you run a crontab in Cygwin on Windows?
...d docs here, on how to get around the setuid problem: davidjnice.com/cygwin_cron_service.html
– Holger Böhnke
Apr 4 '18 at 11:23
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How to serialize an object to XML without getting xmlns=“…”?
...ings()
settings.OmitXmlDeclaration = True
Using ms As New MemoryStream(), _
sw As XmlWriter = XmlWriter.Create(ms, settings), _
sr As New StreamReader(ms)
xs.Serialize(sw, obj, ns)
ms.Position = 0
Console.WriteLine(sr.ReadToEnd())
End Using
in C# like this:
//Create our own namespaces fo...
How do I use itertools.groupby()?
...meone. It's probably because your array is not sorted try groupby(sorted(my_collection, key=lambda x: x[0]), lambda x: x[0])) under the assumption that my_collection = [("animal", "bear"), ("plant", "cactus"), ("animal", "duck")] and you want to group by animal or plant
– Robi...