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How can I get the concatenation of two lists in Python without modifying either one? [duplicate]
...function name, not an operator (Yes, I know that operators are implemented by hidden functions.)
– Ryan C. Thompson
Dec 3 '10 at 19:07
34
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How to establish a connection pool in JDBC?
...vailable 3rd party components:
Apache DBCP - This one is
used internally by Tomcat, and by
yours truly.
c3p0
Apache DBCP comes with different example on how to setup a pooling javax.sql.DataSource. Here is one sample that can help you get started.
...
Shell - Write variable contents to a file
...able:
starts with -e
starts with -n
starts with -E
contains a \ followed by an n
should not have an extra newline appended after it
and so they cannot be relied upon for arbitrary string contents.
In bash, you can use "here strings" as:
cat <<< "$var" > "$destdir"
As noted in t...
How to open a web server port on EC2 instance
... @Noitidart Save is what he means. But I am sure you figured that out by now :)
– mattdevio
Oct 26 '18 at 7:31
Th...
Allow user to set up an SSH tunnel, but nothing else
... this key is used
for authentication. The command supplied by the user (if any) is
ignored.
Attempts to use scp secure file copying will also fail with an echo of "do-not-send-commands" I've found sftp also fails with this configuration.
I think the restricted she...
Do NSUserDefaults persist through an Update to an app in the Appstore?
...ogic linked to the version number, it's just for display (it could be used by contact centre staff when diagnosing faults).
Our experience is NSUserDefaults doesn't get cleared when a user updates our app, but the Settings display doesn't get updated either.
...
Create a “with” block on several context managers? [duplicate]
...or instance A lock, a db connection and an ip socket.
You can acquire them by:
5 Answers
...
Understanding the Rails Authenticity Token
... to service A (which you are logged into), and ask to delete your account, by sending a request to http://serviceA.com/close_account. This is what is known as CSRF (Cross Site Request Forgery).
If service A is using authenticity tokens, this attack vector is no longer applicable, since the request ...
How to create a protocol with methods that are optional?
...ier for a method after compilation. You can provide the correct identifier by using the @selector() directive and specifying the name of the method.
If the data source in this example implements the method, the title is used; otherwise, the title remains nil.
...
How to detect if app is being built for device or simulator in Swift
...answer may work, the recommended solution for a static check (as clarified by several Apple engineers) is to define a custom compiler flag targeting iOS Simulators. For detailed instructions on how to do to it, see @mbelsky's answer.
Original answer
If you need a static check (e.g. not a runtime i...