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Aren't Python strings immutable? Then why does a + “ ” + b work?
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First a pointed to the string "Dog". Then you changed the variable a to point at a new string "Dog eats treats". You didn't actually mutate the string "Dog". Strings are immutable, variables can point at whatever they want.
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Heroku push rejected, no Cedar-supported app detected
...ped me! Please note that you should commit it (add it to the git repo) and then try to push again..
– ItayB
Feb 7 '16 at 17:08
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How to redirect output of an already running process [duplicate]
...; foo1 in one session and test that data from stdin is copied to the file. Then in another session I redirect the output.
Firstly find the PID of the process:
$ ps aux | grep cat
rjc 6760 0.0 0.0 1580 376 pts/5 S+ 15:31 0:00 cat
Now check the file handles it has open:
$ ls -l /proc/6760...
How to resolve “Waiting for Debugger” message?
...or instance, mypro. you would right click on it in the "Package Explorer". Then choose "Debug as"-->"Android Application".
Then the emulator might stop at the "Waiting for connecting to debugger"(or something else similar to this).
Then you need to connect to the debugger yourself by click "DD...
Call An Asynchronous Javascript Function Synchronously
...e to have the calling function do some polling to check a global variable, then have the callback set data to the global.
function doSomething() {
// callback sets the received data to a global var
function callBack(d) {
window.data = d;
}
// start the async
myAsynchronousC...
Java Name Hiding: The Hard Way
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You can cast a null to the type and then invoke the method on that (which will work, since the target object isn't involved in invocation of static methods).
((net.foo.X) null).doSomething();
This has the benefits of
being side-effect free (a problem with ...
What is the difference between buffer and cache memory in Linux?
...ng as dirty the corresponding pages in the page cache; the flusher threads then periodically write back to disk any dirty pages. Reads are implemented by returning the data from the page cache; if the data is not yet in the cache, it is first populated. On a modern Linux system, Cached can easily be...
What is the difference between RegExp’s exec() function and String’s match() function?
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If your regex is global, and you are capturing, then you must use exec. Match won't return all your captures.
Match works great for when just matching(not capturing). You run it once and it gives an array of all the matches. (though if the regex is not global, then ma...
Edit a commit message in SourceTree Windows (already pushed to remote)
... to edit.
For example, if I want to edit the commit with message "FOOBAR!" then I need
to select the commit that comes right before it:
Step 2
Right-click on the selected commit and click Rebase children...interactively:
Step 3
Select the commit that you want to edit, then click Edit Message...
How to create a library project in Android Studio and an application project that uses the library p
...dependancy:
File > Project Structure > Modules > Dependencies
Then add the module (android library) as a module dependency.
Run your project. It will work.
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