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What does preceding a string literal with “r” mean? [duplicate]
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The r means that the string is to be treated as a raw string, which means all escape codes will be ignored.
For an example:
'\n' will be treated as a newline character, while r'\n' will be treated as the characters \ followed by n.
When an 'r' or 'R' prefix is present,
a character following...
How to create empty folder in java? [duplicate]
...dia.net/java/beginners/java-create-directory.shtml
// Create a directory; all non-existent ancestor directories are
// automatically created
success = (new File("../potentially/long/pathname/without/all/dirs")).mkdirs();
if (!success) {
// Directory creation failed
}
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How can a JACC provider use the Principal-to-role mapping facilities of the server it's deployed on?
...lassfish and JBoss support principal-to-role mappings, JACC does no assume all containers do, and so it delegates the responsibility of keeping those mappings to the JACC provider implementation. From the docs (see: PolicyConfiguration.addToRole method):
It is the job of the Policy provider to e...
SQLAlchemy versioning cares about class import order
...he problem by putting the try: except stuff in a lambda and
running them all after all the imports have happened.
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CSS rule to apply only if element has BOTH classes [duplicate]
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Below applies to all tags with the following two classes
.abc.xyz {
width: 200px !important;
}
applies to div tags with the following two classes
div.abc.xyz {
width: 200px !important;
}
If you wanted to modify this using jQuery...
Git error: src refspec master does not match any [duplicate]
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did not help in my case at all unfortunatelly. After the steps, I get another error fatal: Unable to create 'C:/Users/myname/Desktop/work/xamarin/myproj-vs2015/.git/index.lock': File exists. This is followed by "Another git process seems to be runnin...
Working with UTF-8 encoding in Python source [duplicate]
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Is this needed for python3? I know python3 assumes all literals within the code are unicode. But does it assume the source files are also written in utf8?
– Ricardo Cruz
Jun 28 '16 at 23:58
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How to format code in Xcode? [duplicate]
...ant to format and then press Ctrl+I.
Use Cmd+A first if you wish to format all text in the selected file.
Note: this procedure only re-indents the lines, it does not do any advanced formatting.
In XCode 12 beta:
The new key binding to re-indent is Option+I.
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What's the purpose of starting semi colon at beginning of JavaScript? [duplicate]
...'t need to know these additional rules, and hope everyone else does. If we all had perfect knowledge all the time we could program in binary, but we don't. Best practice is there to assist us. It's up to you of course whether you choose to follow it or not.
– James Gaunt
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Filtering a data frame by values in a column [duplicate]
...nce we don't want to restrict which columns we get for those rows (we want all of them), we leave the column part of the index pair blank (so there's nothing after the comma). This is syntactic sugar to avoid having to give a vector of all column indices.
– Will
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