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Most pythonic way to delete a file which may not exist
...
A more pythonic way would be:
try:
os.remove(filename)
except OSError:
pass
Although this takes even more lines and looks very ugly, it avoids the unnecessary call to os.path.exists() and follows the python convention of overusing exceptions.
It may be worthwhile to write a functio...
How can I delete all Git branches which have been merged?
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This produces an error fatal: branch name required if you have no branches that should be deleted. To avoid that you can pass -r to xargs so it won't run git branch -d if the stdin is empty. (This a GNU xargs extension, according to the man...
Oracle SQL: Update a table with data from another table
...n = (select...)
never worked for me since set only expects 1 value - SQL Error: ORA-01427: single-row subquery returns more than one row.
here's the solution:
BEGIN
For i in (select id, name, desc from table1)
LOOP
Update table2 set name = i.name, desc = i.desc where id = i.id;
END LOOP;
END;
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How to delete every other line in Vim?
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105
You can use a macro for this. Do the following.
Start in command mode.
Go to the beginning of...
How to pass command line arguments to a rake task
...don't do this: rake thing:work[1, 2, 3] as it won't work and you'll get an error Don't know how to build task
– rpbaltazar
Sep 29 '16 at 11:30
10
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How can I visualize per-character differences in a unified diff file?
... i had to add ' to the beginning of the value there. otherwise i got an error. Also, i simply using --color-words i get the exact same behaviour as using that regexp.
– gcb
Oct 14 '13 at 6:41
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Callback functions in Java
...hat simple
public interface myCallback {
void onSuccess();
void onError(String err);
}
now to make this callback run when ever you wish to do to handle the results - more likely after async call and you wanna run some stuff which depends on these reuslts
// import the Interface class her...
Differences between Perl and PHP [closed]
... and range (.. and ...). PHP has a few operators Perl doesn't, such as the error suppression operator (@), instanceof (though Perl does have the Universal::isa method) and clone.
In PHP, new is an operator. In Perl, it's the conventional name of an object creation subroutine defined in packages, no...
Most efficient method to groupby on an array of objects
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There's a reference error on your code in jsBin.
– Rod Talingting
Jul 20 at 22:37
add a comment
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How do I initialize a byte array in Java?
... @petmez dumb question: in JAVA, is something like "".getBytes(UTF_8)); (getBytes on an empty string) a safe thing to do? is it 'legal'? Or can I just do: = new byte[0]; ?
– Robert Achmann
Mar 1 '19 at 18:35
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