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why is plotting with Matplotlib so slow?
... 'y-', 'm-', 'k-', 'c-']
lines = [ax.plot(x, y, style)[0] for ax, style in zip(axes, styles)]
fig.show()
tstart = time.time()
for i in xrange(1, 20):
for j, line in enumerate(lines, start=1):
line.set_ydata(np.sin(j*x + i/10.0))
fig.canvas.draw()
print 'FPS:' , 20/(time.time()-tst...
Pythonic way to check if a list is sorted or not
...eger indexing:
# python2 only
if str is bytes:
from itertools import izip as zip
def is_sorted(l):
return all(a <= b for a, b in zip(l, l[1:]))
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java.nio.file.Path for a classpath resource
...e), or having to open and thus safely close the filesystem ourselves (like zip/jar files).
Therefore, the solution above encapsulates the actual action in an interface, handles both cases, safely closing afterwards in the second case, and works from Java 7 to Java 10. It probes whether there is a...
Plotting a list of (x, y) coordinates in python matplotlib
...lt.show()
will produce:
To unpack your data from pairs into lists use zip:
x, y = zip(*li)
So, the one-liner:
plt.scatter(*zip(*li))
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f...
Utilizing multi core for tar+gzip/bzip compression/decompression
...normally compress using tar zcvf and decompress using tar zxvf (using gzip due to habit).
6 Answers
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Finding the index of an item in a list
...ch is pretty much the same approach as enumerate):
from itertools import izip as zip, count # izip for maximum efficiency
[i for i, j in zip(count(), ['foo', 'bar', 'baz']) if j == 'bar']
This is more efficient for larger lists than using enumerate():
$ python -m timeit -s "from itertools import...
How to POST JSON Data With PHP cURL?
...me" => "Lastnameson","phone" => "555-1212", "province" => "ON", "zip" => "123 ABC" ) );
$postdata = json_encode($data);
$ch = curl_init($url);
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, ...
How to perform element-wise multiplication of two lists?
...
Use a list comprehension mixed with zip():.
[a*b for a,b in zip(lista,listb)]
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Get a list of resources from classpath directory
...rt java.util.Enumeration;
import java.util.regex.Pattern;
import java.util.zip.ZipEntry;
import java.util.zip.ZipException;
import java.util.zip.ZipFile;
/**
* list resources available from the classpath @ *
*/
public class ResourceList{
/**
* for all elements of java.class.path get a C...
Automatic counter in Ruby for each?
...
If you don't have the new version of each_with_index, you can use the zip method to pair indexes with elements:
blahs = %w{one two three four five}
puts (1..blahs.length).zip(blahs).map{|pair|'%s %s' % pair}
which produces:
1 one
2 two
3 three
4 four
5 five
...