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Locking a file in Python
I need to lock a file for writing in Python. It will be accessed from multiple Python processes at once. I have found some solutions online, but most fail for my purposes as they are often only Unix based or Windows based.
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How do I check CPU and Memory Usage in Java?
...ge collection logging. You simply add -verbose:gc to the startup command.
From the Sun documentation:
The command line argument -verbose:gc prints information at every
collection. Note that the format of the -verbose:gc output is subject
to change between releases of the J2SE platform. For ...
Detect if device is iOS
... version
The most common way of detecting the iOS version is by parsing it from the User Agent string. But there is also feature detection inference*;
We know for a fact that history API was introduced in iOS4 - matchMedia API in iOS5 - webAudio API in iOS6 - WebSpeech API in iOS7 and so on.
Note: T...
sed command with -i option failing on Mac, but works on Linux
...n of which implementation of sed you are dealing with. On a Mac sed comes from BSD and is subtly different from the sed you might find on a typical Linux box. I suggest you man sed.
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How to set NODE_ENV to production/development in OS X
...a config.json file in your directory and everytime your app runs, it reads from it and sets the configuration.
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How do I manually create a file with a . (dot) prefix in Windows? For example, .htaccess
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Within Notepad select File > Save As...
File name: ".whatever you want" (with the leading dot)
You can do it in Explorer (in Windows 7) by adding a period at the end of the filename:
.whatever you want.
Windows will automatically re...
psql: could not connect to server: No such file or directory (Mac OS X)
...brew info postgresql found out this that helped:
To migrate existing data from a previous major version of PostgreSQL run:
brew postgresql-upgrade-database
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How the single threaded non blocking IO model works in Node.js
...t/context the notified event belongs to and proceed processing the request from there. Note that this will necessarily mean you'll be on a different stack frame from the one that originated the request to the OS as the latter had to yield to a process' dispatcher in order for a single threaded proce...
Calling startActivity() from outside of an Activity?
...uirement is now enforced
With Android 9, you cannot start an activity from a non-activity
context unless you pass the intent flag FLAG_ACTIVITY_NEW_TASK. If you
attempt to start an activity without passing this flag, the activity
does not start, and the system prints a message to the log....
How do I serialize an object and save it to a file in Android?
...size()];
int i=0;
for (JsonElement jsonElement : arr)
events[i++]=gson.fromJson(jsonElement, Event.class);
//Object example
pagination=gson.fromJson(parser.parse(jsonPagination).getAsJsonObject(), Pagination.class);
sha...