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Python creating a dictionary of lists
...s import defaultdict
>>> d = defaultdict(list)
>>> a = ['1', '2']
>>> for i in a:
... for j in range(int(i), int(i) + 2):
... d[j].append(i)
...
>>> d
defaultdict(<type 'list'>, {1: ['1'], 2: ['1', '2'], 3: ['2']})
>>> d.items()
[(1, ['1']), (...
CSS horizontal centering of a fixed div?
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168
left: 50%;
margin-left: -400px; /* Half of the width */
...
Is Java Regex Thread Safe?
...
133
Yes, from the Java API documentation for the Pattern class
Instances of this (Pattern) class...
Getting error: Peer authentication failed for user “postgres”, when trying to get pgsql working with
...
21 Answers
21
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How can I change UIButton title color?
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edited May 23 '17 at 12:18
Community♦
111 silver badge
answered Mar 19 '10 at 0:39
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Default value in Go's method
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answered Oct 26 '13 at 22:43
sdanzigsdanzig
3,4901919 silver badges2323 bronze badges
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How to append multiple values to a list in Python
...r any other thing that provides a sequence of values.
>>> lst = [1, 2]
>>> lst.append(3)
>>> lst.append(4)
>>> lst
[1, 2, 3, 4]
>>> lst.extend([5, 6, 7])
>>> lst.extend((8, 9, 10))
>>> lst
[1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
>>> ...
What does %~dp0 mean, and how does it work?
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818
Calling
for /?
in the command-line gives help about this syntax (which can be used outside F...
error: default argument given for parameter 1
...
1 Answer
1
Active
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Detect & Record Audio in Python
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106
As a follow up to Nick Fortescue's answer, here's a more complete example of how to record fro...