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Add a new element to an array without specifying the index in Bash
...is syntax first appeared in version 3.1-alpha1.
– David Yaw
Jan 3 '14 at 21:17
41
@Jas: To access...
Any equivalent to .= for adding to beginning of string in PHP?
... that in there you don't need to worry about passing in a null value by accident.
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postgresql COUNT(DISTINCT …) very slow
...
@ankur this wasn't much useful for me..didn't get any remarkable improvement.
– Shiwangini
Sep 9 '19 at 8:18
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How to unpack and pack pkg file?
...dit. And there's also a Bom file that includes information on the files inside that cpio archive, and a PackageInfo file that includes summary information.
If you really do just need to edit one of the info files, that's simple:
mkdir Foo
cd Foo
xar -xf ../Foo.pkg
# edit stuff
xar -cf ../Foo-new.p...
Convert Mercurial project to Git [duplicate]
...Mercurial or downgrade fast-export by running git checkout tags/v180317 inside ~/fast-export directory.".
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WPF: How to programmatically remove focus from a TextBox
.... In my practical example, I have the Window looking for "Key.Escape" and calling Close(). This stops working if you run ClearFocus() anywhere.
– Denis P
Feb 8 '17 at 23:34
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Delete first character of a string in Javascript
...f the .substring() method is actually optional, so you don't even need to call .length()...
TL;DR : Remove first character from the string:
str = str.substring(1);
...yes it is that simple...
Removing some particular character(s):
As @Shaded suggested, just loop this while first character of your ...
Redirecting to URL in Flask
...esponse=None)
Returns a response object (a WSGI application) that, if called, redirects the client to the target location. Supported codes are 301, 302, 303, 305, and 307. 300 is not supported because it’s not a real redirect and 304 because it’s the answer for a request with a request with...
Conditional Replace Pandas
...n setting values in a pandas object, care must be taken to avoid
what is called chained indexing.
You have a few alternatives:-
loc + Boolean indexing
loc may be used for setting values and supports Boolean masks:
df.loc[df['my_channel'] > 20000, 'my_channel'] = 0
mask + Boolean indexing...
Does a valid XML file require an XML declaration?
...on doesn't work when it encounters 8-bit encodings that use characters outside the US-ASCII range (e.g. ISO 8859-1) -- avoid creating these if you can.
The standalone indicates whether the XML document can be correctly processed without the DTD or not. People rarely use it. These days, it is a bad ...