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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...
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._...
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
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Round a double to 2 decimal places [duplicate]
If the value is 200.3456 , it should be formatted to 200.34 .
If it is 200 , then it should be 200.00 .
13 Answers
...
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
...
Check if a JavaScript string is a URL
Is there a way in JavaScript to check if a string is a URL?
32 Answers
32
...
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 ...
One-liner to check whether an iterator yields at least one element?
...
any won't go beyond the first element if it's True. In case the iterator yields something false-ish you can write any(True for _ in iterator).
share
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improve th...
Using isKindOfClass with Swift
I'm trying to pick up a bit of Swift lang and I'm wondering how to convert the following Objective-C into Swift:
5 Answers
...
What does the star operator mean, in a function call?
... to accept any number of positional and/or named arguments that aren't specifically named in the declaration.
Example:
def sum(*values):
s = 0
for v in values:
s = s + v
return s
s = sum(1, 2, 3, 4, 5)
or with **:
def get_a(**values):
return values['a']
s = get_a(a=1, ...