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Why doesn't Python have a sign function?
...th.copysign(1, float("-nan")) returns 1.0 instead of -1.0 when I try it in 2.7
– dansalmo
May 24 '13 at 3:39
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Fast way of counting non-zero bits in positive integer
...
Did you benchmark this? On my machine using python 2.7, I found this to actually be a bit slower than bin(n).count("1").
– David Weldon
Mar 22 '12 at 20:53
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Git submodule push
...the submodule inside of another submodule will not be pushed.
With git 2.7 (January 2016), a simple git push will be enough to push the parent repo... and all its submodules.
See commit d34141c, commit f5c7cd9 (03 Dec 2015), commit f5c7cd9 (03 Dec 2015), and commit b33a15b (17 Nov 2015) by Mike...
Why can't non-default arguments follow default arguments?
... feature of Python 3. Too bad the patch to backport them to Python 2.6 and 2.7 was just left to expire.
– Nick Chammas
Mar 20 '15 at 18:42
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How can I obtain the element-wise logical NOT of a pandas Series?
...8]:
0 False
1 False
2 True
3 False
dtype: bool
Using Python2.7, NumPy 1.8.0, Pandas 0.13.1:
In [119]: s = pd.Series([True, True, False, True]*10000)
In [10]: %timeit np.invert(s)
10000 loops, best of 3: 91.8 µs per loop
In [11]: %timeit ~s
10000 loops, best of 3: 73.5 µs per lo...
How to pretty-print a numpy.array without scientific notation and with given precision?
...mpy/reference/generated/numpy.set_printoptions.html
http://docs.python.org/2.7/library/stdtypes.html#string-formatting
'''
# http://stackoverflow.com/questions/2891790/pretty-printing-of-numpy-array
#...............................................................................
from __future__ i...
Reading binary file and looping over each byte
...ff with byte.
byte = f.read(1)
finally:
f.close()
Python 2.5-2.7
with open("myfile", "rb") as f:
byte = f.read(1)
while byte != "":
# Do stuff with byte.
byte = f.read(1)
Note that the with statement is not available in versions of Python below 2.5. To use it...
Specifying and saving a figure with exact size in pixels
...efig('figure.png', dpi=1)
I am using the last PIP versions of the Python 2.7 libraries in Linux Mint 13.
Hope that helps!
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What is the best way to do a substring in a batch file?
... - expands %I to a file extension only
%~sI - expanded path contains short names only
%~aI - expands %I to file attributes of file
%~tI - expands %I to date/time of file
%~zI - expands %I to size of file
%~$PATH:I - searches the directories listed in the PATH
...
App Inventor 2 中的响应式设计 · App Inventor 2 中文网
...ng sizes as percentages
Fixed vs. responsive sizing
Detailed example
Special circumstances
Limitation: Drawing and animation
Responsive design and Google Play
One tricky issue in designing apps is making apps that look good on devices with scree...