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What is the purpose of setting a key in data.table?
...ns of the form x[i] required key to be set on x. With the new on= argument from v1.9.6+, this is not true anymore, and setting keys is therefore not an absolute requirement here as well.
## joins using < v1.9.6
setkey(X, a) # absolutely required
setkey(Y, a) # not absolutely required as long a...
No module named setuptools
...ing twilio
Using cached twilio-5.3.0.tar.gz
Collecting httplib2>=0.7 (from twilio)
Using cached httplib2-0.9.2.tar.gz
Collecting six (from twilio)
Using cached six-1.10.0-py2.py3-none-any.whl
Collecting pytz (from twilio)
Using cached pytz-2015.7-py2.py3-none-any.whl
Building wheels for c...
Video auto play is not working in Safari and Chrome desktop browser
...me for Android (Version 56.0).
As per this post in developers.google.com, From Chrome 53, the autoplay option is respected by the browser, if the video is muted.
So using autoplay muted attributes in video tag enables the video to be autoplayed in Chrome browsers from version 53.
Excerpt from t...
Constructor overload in TypeScript
...{
return new Date().getFullYear() - birthday;
}
class Person {
static fromData(data: PersonData): Person {
const { first, last, birthday, gender = 'M' } = data;
return new this(
`${last}, ${first}`,
calculateAge(birthday),
gender,
);
}
constructor(
public ...
Why is argc not a constant?
...ritten such programs in C, and I know I'm not alone. I copied the example from somewhere.
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How does this program work?
...ted to double, as the prototype of printf is int printf(const char*, ...), from 6.5.2.2/7,
The ellipsis notation in a function prototype declarator causes argument type conversion to stop after the last declared parameter. The default argument promotions are performed on trailing arguments.
an...
How do I uninstall nodejs installed from pkg (Mac OS X)?
I installed NodeJS from pkg file on my Mac. Now I need to uninstall it. Tell me please how to do it.
I tried to remove files from this list:
...
Difference between 'python setup.py install' and 'pip install'
I have an external package I want to install into my python virtualenv from a tar file.
What is the best way to install the package?
...
How do I list the symbols in a .so file
How do I list the symbols being exported from a .so file? If possible, I'd also like to know their source (e.g. if they are pulled in from a static library).
...
What does “:=” do?
...
@TigOldBitties, Good gotcha from Erwin down there.
– Pacerier
Apr 6 '15 at 14:27
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