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Calculate the median of a billion numbers
...erform a modified merge, in which it finds the least of all those top-of-a-range values, then tells all the sorting machines what it was, so that they can (a) tell the control machine how many values to "count" below that value, and (b) resume sending their sorted data from that point.
More general...
Remove non-ascii character in string
...
ASCII is in range of 0 to 127, so:
str.replace(/[^\x00-\x7F]/g, "");
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How to extract the n-th elements from a list of tuples?
...slower than the list comprehension:
setup = 'elements = [(1,1,1) for _ in range(100000)];from operator import itemgetter'
method1 = '[x[1] for x in elements]'
method2 = 'map(itemgetter(1), elements)'
import timeit
t = timeit.Timer(method1, setup)
print('Method 1: ' + str(t.timeit(100)))
t = timeit...
Converting integer to string in Python
...
To manage non-integer inputs:
number = raw_input()
try:
value = int(number)
except ValueError:
value = 0
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How to serve an image using nodejs
...f someone doesn't want to rely on anyone to get the job done then at least raw TCP sockets should be used instead - which I do in one of my examples below.
A more serious problem is that all of the answers here that use the http module are broken. They introduce race conditions, insecure path resol...
How do I concatenate two lists in Python?
...umming iterables into a
list, such as my_list + list(my_tuple) + list(my_range) which is now
equivalent to just [*my_list, *my_tuple, *my_range].
So while addition with + would raise a TypeError due to type mismatch:
l = [1, 2, 3]
r = range(4, 7)
res = l + r
The following won't:
res = [*l,...
Have a reloadData for a UITableView animate when changing
... sections :) - [_tableView reloadSections:[NSIndexSet indexSetWithIndexesInRange:NSMakeRange(0, sectionCount)] withRowAnimation:UITableViewRowAnimationFade];
– lobianco
Feb 4 '14 at 0:16
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Set markers for individual points on a line in Matplotlib
...lot.
For example, using a dashed line and blue circle markers:
plt.plot(range(10), linestyle='--', marker='o', color='b')
A shortcut call for the same thing:
plt.plot(range(10), '--bo')
Here is a list of the possible line and marker styles:
================ ===========================...
Understanding generators in Python
...describe certain common types of generators:
>>> g = (n for n in range(3, 5))
>>> next(g)
3
>>> next(g)
4
>>> next(g)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
StopIteration
Note that generator expressions are much lik...
How do I create a variable number of variables?
...ly create those variable names, and may try something like this:
for i in range(10):
my_calculator.('button_%d' % i) = tkinter.Button(root, text=i)
They soon find that this does not work.
If the program requires arbitrary variable "names," a dictionary is the best choice, as explained in oth...