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Add a new element to an array without specifying the index in Bash
Is there a way to do something like PHPs $array[] = 'foo'; in bash vs doing:
5 Answers
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How to unpack and pack pkg file?
I have a pkg file created by Install Maker for Mac.
I want to replace one file in pkg. But I must do this under Linux system, because this is a part of download process. When user starts to download file server must replace one file in pkg.
I have a solution how unpack pkg and replace a file but I d...
Python: most idiomatic way to convert None to empty string?
What is the most idiomatic way to do the following?
16 Answers
16
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DatabaseError: current transaction is aborted, commands ignored until end of transaction block?
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This is what postgres does when a query produces an error and you try to run another query without first rolling back the transaction. (You might think of it as a safety feature, to keep you from corrupting your data.)
To fix this, you'll want to figure out where in the code that bad query is...
Is it Pythonic to use list comprehensions for just side effects?
...on that I'm calling for its side effects, not return values (like printing to screen, updating GUI, printing to a file, etc.).
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Numpy: Get random set of rows from 2D array
...])
>>> A[idx,:]
array([[0, 4, 1],
[1, 3, 1]])
Putting it together for a general case:
A[np.random.randint(A.shape[0], size=2), :]
For non replacement (numpy 1.7.0+):
A[np.random.choice(A.shape[0], 2, replace=False), :]
I do not believe there is a good way to generate random l...
Is there a way to comment out markup in an .ASPX page?
Is there a way to comment out markup in an .ASPX page so that it isn't delivered to the client? I have tried the standard comments <!-- --> but this just gets delivered as a comment and doesn't prevent the control from rendering.
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How do I convert a org.w3c.dom.Document object to a String?
I want to convert a org.w3c.dom.Document object to a String. I'm using Java 6 and am open to using any (completely free) technology that is up to the task. I tried the solution from this thread -- Is there a more elegant way to convert an XML Document to a String in Java than this code? , where t...
Reading a plain text file in Java
It seems there are different ways to read and write data of files in Java.
28 Answers
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Android image caching
...ry and flash-rom cache, shared with the browser.
grr. I wish somebody had told ME that before i wrote my own cache manager.
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