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Creating Threads in python
...rt Thread
from time import sleep
def threaded_function(arg):
for i in range(arg):
print("running")
sleep(1)
if __name__ == "__main__":
thread = Thread(target = threaded_function, args = (10, ))
thread.start()
thread.join()
print("thread finished...exiting")
H...
How to calculate moving average using NumPy?
...[n:] = ret[n:] - ret[:-n]
return ret[n - 1:] / n
>>> a = np.arange(20)
>>> moving_average(a)
array([ 1., 2., 3., 4., 5., 6., 7., 8., 9., 10., 11.,
12., 13., 14., 15., 16., 17., 18.])
>>> moving_average(a, n=4)
array([ 1.5, 2.5, 3....
Increase number of axis ticks
...different scales of numbers, i.e., 0.5 is a good value for this data which range is c(-3,3), but it's not a good range for a data which range is c(0,5000). Is there some function that calculates it?
– João Daniel
Jul 4 '12 at 22:33
...
What does the “at” (@) symbol do in Python?
...lf, B):
A = self
return Mat([[sum(A[i][k]*B[k][j] for k in range(len(B)))
for j in range(len(B[0])) ] for i in range(len(A))])
A = Mat([[1,3],[7,5]])
B = Mat([[6,8],[4,2]])
print(A @ B)
This code yields:
[[18, 14], [62, 66]]
...
Clean ways to write multiple 'for' loops
...the for loops can be a lot confusing, just to save few characters. I'd use range-for loops instead:
for (auto& k : A)
for (auto& i : k)
for (auto& j : i)
do_something_on_A(j);
Of course you can replace auto& with const auto& if you are, in fact, not mod...
Only detect click event on pseudo-element
...s X and Y also relative to the document.
Therefore, I can come up with a range of "clickable" region on the entire page that never changes.
Here's my demo on codepen.
or if too lazy for codepen, here's the JS:
* I only cared about the Y values for my example.
var box = $('.box');
// clicka...
Convert a 1D array to a 2D array in numpy
...esize function and mixing it with np.reshape, such as
>>> a =np.arange(9)
>>> np.resize(a, 10).reshape(5,2)
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Finding the number of days between two dates
...M,$EndD,$EndY) - gregoriantojd($StartM,$StartD,$StartY); (for an inclusive range). Unlike the Datetime Class, Gregorian to Julian is available in v4 up. Valid range is 4714 B.C. to 9999 A.D. Beware of the funky parameter order (like you need that warning for php).
– Guy Gord...
Selecting with complex criteria from pandas.DataFrame
...mport randint
>>> df = pd.DataFrame({'A': [randint(1, 9) for x in range(10)],
'B': [randint(1, 9)*10 for x in range(10)],
'C': [randint(1, 9)*100 for x in range(10)]})
>>> df
A B C
0 9 40 300
1 9 70 700
2 5 70 900
3 8 80 900...
Creating functions in a loop
...rguments are evaluated immediately when the function is defined:
for i in range(3):
def f(i=i): # <- right here is the important bit
return i
functions.append(f)
To give a little bit of insight into how/why this works: A function's default arguments are stored as an attribute...