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Determine if Python is running inside virtualenv

...nside a virtual environment, sys.prefix points to the virtual environment, and sys.base_prefix is the prefix of the system Python the virtualenv was created from. The above always works for Python 3 stdlib venv and for recent virtualenv (since version 20). Older versions of virtualenv used sys.real_...
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sed command with -i option failing on Mac, but works on Linux

I've successfully used the following sed command to search/replace text in Linux: 12 Answers ...
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Find and replace Android studio

Is there a way to find and replace all occurrences of a word in an entire project( not just a single class using refactor -> rename) and also maintain case, either in android studio or using a command line script? ...
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CPU Privilege Rings: Why rings 1 and 2 aren't used?

...the modern protection model) only has a concept of privileged (ring 0,1,2) and unprivileged, the benefit to rings 1 and 2 were diminished greatly. The intent by Intel in having rings 1 and 2 is for the OS to put device drivers at that level, so they are privileged, but somewhat separated from the r...
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Java current machine name and logged in user?

...it possible to get the name of the currently logged in user (Windows/Unix) and the hostname of the machine? 4 Answers ...
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Activity transition in Android

How can I define the transition between two activities for Android 1.5 and later? I would like an activity to fade in. 14 ...
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psql: could not connect to server: No such file or directory (Mac OS X)

...master has exited.). SOLUTION: This fixed the issue--I deleted this file, and then everything worked! /usr/local/var/postgres/postmaster.pid -- and here is how I figured out why this needed to be deleted. I used the following command to see if there were any PG processes running. for me ther...
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How can I start PostgreSQL server on Mac OS X?

I had forgotten to run the initdb command. 33 Answers 33 ...
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How do I disable orientation change on Android?

...lication that I just would like to use in portrait mode, so I have defined android:screenOrientation="portrait" in the manifest XML. This works OK for the HTC Magic phone (and prevents orientation changes on other phones as well). ...
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Windows batch files: .bat vs .cmd?

As I understand it, .bat is the old 16-bit naming convention, and .cmd is for 32-bit Windows, i.e., starting with NT. But I continue to see .bat files everywhere, and they seem to work exactly the same using either suffix. Assuming that my code will never need to run on anything older than NT, d...