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Single Line Nested For Loops
... loop per se, but a list comprehension.
Would be equivalent to
for j in range(0, width):
for i in range(0, height):
m[i][j]
Much the same way, it generally nests like for loops, right to left. But list comprehension syntax is more complex.
I'm not sure what this question is asking
...
When to use cla(), clf() or close() for clearing a plot in matplotlib?
...links).
So the the following script will produce an empty list:
for i in range(5):
fig = plot_figure()
plt.close(fig)
# This returns a list with all figure numbers available
print(plt.get_fignums())
Whereas this one will produce a list with five figures on it.
for i in range(5):
fig...
Optional Parameters in Go?
...
range is the same case as make, in that sense
– thiagowfx
Jul 30 '14 at 2:45
14
...
Numpy - add row to array
...5,6])
n_loops = 100
start_clock = perf_counter()
for count in range(0, n_loops):
numpy_array = np.vstack([numpy_array, numpy_row]) # 5.8 micros
duration = perf_counter() - start_clock
print('numpy 1.14 takes {:.3f} micros per row'.format(duration * 1e6 / n_loops))
st...
What MySQL data type should be used for Latitude/Longitude with 8 decimal places?
...o be absolutely sure of 8d.p. precision you should use DECIMAL.
Latitudes range from -90 to +90 (degrees), so DECIMAL(10, 8) is ok for that, but longitudes range from -180 to +180 (degrees) so you need DECIMAL(11, 8). The first number is the total number of digits stored, and the second is the numb...
Resetting generator object in Python
...ntil StopIteration and 2) it doesn't wotk with any generator (for instance range)
– Eric
Sep 2 at 16:49
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Is there a list of screen resolutions for all Android based phones and tablets? [closed]
... that are rarely seen at phone size or larger, all the other devices fit a range from 1.3333 to 1.7778, which conveniently matches the current iPhone/iPad ratios (considering all devices in portrait mode). Note that there are quite a few variations within that range, so if you are creating a small n...
How to make rounded percentages add up to 100%
...ents[i], rounded[i] + 1) - error_gen(percents[i], rounded[i]), i) for i in range(n)]
rank = sorted(errors)
for i in range(up_count):
rounded[rank[i][1]] += 1
return rounded
>>> round_to_100([13.626332, 47.989636, 9.596008, 28.788024])
[14, 48, 9, 29]
>>> round_...
Add column with constant value to pandas dataframe [duplicate]
...nment is broadcasted by pandas for each row.
df = pd.DataFrame('x', index=range(4), columns=list('ABC'))
df
A B C
0 x x x
1 x x x
2 x x x
3 x x x
df['new'] = 'y'
# Same as,
# df.loc[:, 'new'] = 'y'
df
A B C new
0 x x x y
1 x x x y
2 x x x y
3 x x x y
...
pandas: How do I split text in a column into multiple rows?
....DataFrame(['a b c']*100000, columns=['col']);
print pd.DataFrame(dict(zip(range(3), [df['col'].apply(lambda x : x.split(' ')[i]) for i in range(3)]))).head()"
The second simply refrains from allocating 100 000 Series, and this is enough to make it around 10 times faster. But the third solution, w...