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Python - Create a list with initial capacity
... if the preallocation method (size*[None]) itself is inefficient? Does the python VM actually allocate the list at once, or grow it gradually, just like the append() would?
– haridsv
Nov 15 '09 at 3:01
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IntelliJ IDEA with Junit 4.7 “!!! JUnit version 3.8 or later expected:”
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Another way: Edit your jdk.table.xml at ~/Library/Preferences/AndroidStudioX.X/options/jdk.table.xml or C:\Users\Name\.AndroidStudioX.X\config\options\jdk.table.xml on Windows. Find the node <name value="Android API 28 Platform" /> and set its <anno...
Convert an image to grayscale in HTML/CSS
... a single SVG file and some CSS.
Your SVG file will look like this:
<?xml version="1.0" encoding="UTF-8"?>
<svg version="1.1"
baseProfile="full"
xmlns="http://www.w3.org/2000/svg">
<filter id="desaturate">
<feColorMatrix type="matrix" values="0.3333 0.333...
Animated loading image in picasso
...e using Picasso placeholder:
I solved this easily using a animated-rotate xml object.
Steps:
progress_image.png
/res/drawable/progress_animation.xml
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item android:gra...
Python logging: use milliseconds in time format
...me object instead of a struct_time, then (at least with modern versions of Python) we can call ct.strftime and then we can use %f to format microseconds:
import logging
import datetime as dt
class MyFormatter(logging.Formatter):
converter=dt.datetime.fromtimestamp
def formatTime(self, reco...
How to parse JSON in Python?
My project is currently receiving a JSON message in python which I need to get bits of information out of. For the purposes of this, let's set it to some simple JSON in a string:
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Python TypeError: not enough arguments for format string
...e % syntax for formatting strings is becoming outdated. If your version of Python supports it, you should write:
instr = "'{0}', '{1}', '{2}', '{3}', '{4}', '{5}', '{6}'".format(softname, procversion, int(percent), exe, description, company, procurl)
This also fixes the error that you happened to...
How do I convert a IPython Notebook into a Python file via commandline?
...
If you don't want to output a Python script every time you save, or you don't want to restart the IPython kernel:
On the command line, you can use nbconvert:
$ jupyter nbconvert --to script [YOUR_NOTEBOOK].ipynb
As a bit of a hack, you can even call t...
Revert the `--no-site-packages` option with virtualenv
...tual environment.
Where venv is the name of your virtual environment, and python3.4 corresponds to whichever version of python involved, for example:
$ rm venv/lib/python3.4/no-global-site-packages.txt
And if you change your mind and want to put it back:
$ touch venv/lib/python3.4/no-global-sit...
How many classes should I put in one file? [closed]
I'm used to the Java model where you can have one public class per file. Python doesn't have this restriction, and I'm wondering what's the best practice for organizing classes.
...