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Why do x86-64 instructions on 32-bit registers zero the upper part of the full 64-bit register?
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I'm not AMD or speaking for them, but I would have done it the same way. Because zeroing the high half doesn't create a dependency on the previous value, that the CPU would have to wait on. The register renaming mechanism would essential...
What is the difference between Python's list methods append and extend?
... What is the difference between extend and simply using the addition operator - in the above example, x = x + [4, 5]?
– Rohan
May 29 '17 at 22:10
315
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Do a “git export” (like “svn export”)?
I've been wondering whether there is a good "git export" solution that creates a copy of a tree without the .git repository directory. There are at least three methods I know of:
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How do I pass parameters to a jar file at the time of execution?
...dited Oct 13 '17 at 7:06
Paolo Forgia
5,50477 gold badges3535 silver badges5555 bronze badges
answered Jan 19 '09 at 6:27
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How do I align views at the bottom of the screen?
... will be aligned to the end and the bottom of the screen.
<android.support.constraint.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_height="...
UnicodeEncodeError: 'ascii' codec can't encode character u'\xa0' in position 20: ordinal not in rang
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You need to read the Python Unicode HOWTO. This error is the very first example.
Basically, stop using str to convert from unicode to encoded text / bytes.
Instead, properly use .encode() to encode the string:
p.agent_info = u' '.join((agent_contact, agent_telno)).encode('...
pip installing in global site-packages instead of virtualenv
... bin/pip and bin/activate scripts. In bin/pip, look at the shebang. Is it correct? If not, correct it. Then on line ~42 in your bin/activate, check to see if your virtualenv path is right. It'll look something like this
VIRTUAL_ENV="/Users/me/path/to/virtual/environment"
If it's wrong, correct it...
Is there a way to pass the DB user password into the command line tool mysqladmin?
...ently use the following but it ALWAYS prompts me to manually type the password. Is there any way to pass it in on the command line when launching the executable?
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class
...t; self opens up self's singleton class, so that methods can be redefined for the current self object (which inside a class or module body is the class or module itself). Usually, this is used to define class/module ("static") methods:
class String
class << self
def value_of obj
o...
Open a file with su/sudo inside Emacs
Suppose I want to open a file in an existing Emacs session using su or sudo , without dropping down to a shell and doing sudoedit or sudo emacs . One way to do this is
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