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Using the RUN instruction in a Dockerfile with 'source' does not work
... Eh? If you source a script inside a shell that only exists for the command, it's not able to have a lasting effect on any future commands run, assuming that the sum total of its action is setting environment variables. So why would you use source at all, vs just bash /usr/local/bin/virtualenvwra...
Determine if 2 lists have the same elements, regardless of order? [duplicate]
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You can simply check whether the multisets with the elements of x and y are equal:
import collections
collections.Counter(x) == collections.Counter(y)
This requires the elements to be hashable; runtime will be in O(n), where n is the size of the lists.
If the elements are also unique, y...
Upgrade python packages from requirements.txt using pip command
... I upgrade all my python packages from requirements.txt file using pip command?
13 Answers
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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
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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...
Android, ListView IllegalStateException: “The content of the adapter has changed but ListView did no
... I want to do : run a background thread which calculates ListView contents and update ListView partially, while results are calculated.
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What are CFI directives in Gnu Assembler (GAS) used for?
There seem to be a .CFI directive after every line and also there are wide varities of these ex., .cfi_startproc , .cfi_endproc etc.. more here .
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When would you use .git/info/exclude instead of .gitignore to exclude files?
I am a bit confused about the pros and cons of using .git/info/exclude and .gitignore to exclude files.
4 Answers
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How are Anonymous inner classes used in Java?
...ut actually making a separate class.
I only use this technique for "quick and dirty" tasks where making an entire class feels unnecessary. Having multiple anonymous inner classes that do exactly the same thing should be refactored to an actual class, be it an inner class or a separate class.
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Writing files in Node.js
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I've tested this script using Node, and I tried changing the file path to "/home/", but I got the following error: { [Error: EACCES, open '/home/test.txt'] errno: 3, code: 'EACCES', path: '/home/test.txt' } How can I modify this script so that it will work out...
how to implement a pop up dialog box in iOS
... say display a custom UI in your UIAlertView, you can subclass UIAlertView and put in custom UI components in the init method. If you want to respond to a button press after a UIAlertView appears, you can set the delegate above and implement the - (void)alertView:(UIAlertView *)alertView clickedButt...