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How do I break out of a loop in Perl?
...h, I found it. You use last instead of break
for my $entry (@array){
if ($string eq "text"){
last;
}
}
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Copy multiple files in Python
...istdir() to get the files in the source directory, os.path.isfile() to see if they are regular files (including symbolic links on *nix systems), and shutil.copy to do the copying.
The following code copies only the regular files from the source directory into the destination directory (I'm assuming...
Flatten an irregular list of lists
...boost the performance.
Python 2
def flatten(l):
for el in l:
if isinstance(el, collections.Iterable) and not isinstance(el, basestring):
for sub in flatten(el):
yield sub
else:
yield el
I used the Iterable ABC added in 2.6.
Python 3
I...
Cancellation token in Task constructor: why?
...tephen Toub's answer from MSDN:
This has two primary benefits:
If the token has cancellation requested prior to the Task starting to execute, the Task won't execute. Rather than transitioning to
Running, it'll immediately transition to Canceled. This avoids the
costs of running the ...
Finding local IP addresses using Python's stdlib
...
This appears to only return a single IP address. What if the machine has multiple addresses?
– Jason R. Coombs
Oct 23 '09 at 14:39
29
...
Bootstrap 3 jquery event for active tab change
...
If you have to use the change event (regardless of the action from the link), simply use$(document).on('shown.bs.tab', function (e) { console.log('ae'); });
– Aline Matos
May 13 '16 at ...
Add a new element to an array without specifying the index in Bash
...). Note that ARRAY is just a placeholder for an actual variable name. Even if your array indices are not sequential, appending with += will simply assign to the highest index + 1.
– mklement0
Sep 21 '12 at 3:01
...
How to implement a binary tree?
...f getRoot(self):
return self.root
def add(self, val):
if self.root is None:
self.root = Node(val)
else:
self._add(val, self.root)
def _add(self, val, node):
if val < node.v:
if node.l is not None:
self._...
Index all *except* one item in python
... # [9, 8, 7, 6, 5, 4, 3, 2, 1, 0]
b = [x for i,x in enumerate(a) if i!=3] # [9, 8, 7, 5, 4, 3, 2, 1, 0]
This is very general, and can be used with all iterables, including numpy arrays. If you replace [] with (), b will be an iterator instead of a list.
Or you could do this in-place ...
Doing something before program exit
...e atexit module:
http://docs.python.org/library/atexit.html
For example, if I wanted to print a message when my application was terminating:
import atexit
def exit_handler():
print 'My application is ending!'
atexit.register(exit_handler)
Just be aware that this works great for normal ter...