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What characters are allowed in an email address?
... first or last character unless quoted, and provided also that it does not appear consecutively unless quoted (e.g. John..Doe@example.com is not allowed but "John..Doe"@example.com is allowed);
space and "(),:;<>@[\] characters are allowed with restrictions (they are only allowed inside a qu...
Why Does OAuth v2 Have Both Access and Refresh Tokens?
... file on an insecure resource server, beta or poorly coded resource server app, JS SDK client on a non https site that puts the access_token in a cookie, etc)
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Ternary operator is twice as slow as an if-else block?
...nothing to 'fix' about the ternary operator. it's usage in this case just happens to cause a different register allocation. In a different case, it might be faster than if/else, as I tried to explain in my answer.
– Eren Ersönmez
Jun 27 '13 at 12:41
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Benefits of header-only libraries
...ep for the user - compiling your library before using it.
Of course, this applies on a case-by-case basis. For example, header-only libraries sometimes increase code size & compilation times.
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What is the difference between the kernel space and the user space?
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So per se, To run a user space process, it must be mapped to kernel space?
– roottraveller
Sep 9 '17 at 12:58
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Reduce, fold or scan (Left/Right)?
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In general, all 6 fold functions apply a binary operator to each element of a collection. The result of each step is passed on to the next step (as input to one of the binary operator's two arguments). This way we can cumulate a result.
reduceLeft and reduc...
How to explain Katana and OWIN in simple words and uses?
...WIN is not a framework. OWIN is a specification on how web servers and web applications should be built in order to decouple them and allow movement of ASP.NET applications to environments which were not supported before.
Prior to OWIN, when building ASP.NET application, you were inherently bound t...
How do I list all files of a directory?
...:
import glob
txtfiles = []
for file in glob.glob("*.txt"):
txtfiles.append(file)
glob with list comprehension
import glob
mylist = [f for f in glob.glob("*.txt")]
glob with a function
The function returns a list of the given extension (.txt, .docx ecc.) in the argument
import ...
What does “Could not find or load main class” mean?
...<arg> is an arbitrary command line argument that gets passed to your application.
1 - There are some other syntaxes which are described near the end of this answer.
The fully qualified name (FQN) for the class is conventionally written as you would in Java source code; e.g.
packagen...
Where are my postgres *.conf files?
...t PostgreSQL. See pg_clt -D, check postgresql.org/docs/current/interactive/app-pg-ctl.html
– Frank Heikens
Sep 1 '10 at 9:51
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