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How should one use std::optional?
... that data (such as with an expected, yet not necessary, element within an XML document) is optionally provided, so that I can explicitly and clearly show if the data was actually present in the XML document. Especially when the data can have a "not set" state, versus an "empty" and a "set" state (f...
How to sort two lists (which reference each other) in the exact same way
...e the "decorate, sort, undecorate" idiom, which is especially simple using python's built-in zip function:
>>> list1 = [3,2,4,1, 1]
>>> list2 = ['three', 'two', 'four', 'one', 'one2']
>>> list1, list2 = zip(*sorted(zip(list1, list2)))
>>> list1
(1, 1, 2, 3, 4)
&g...
Finding differences between elements of a list
....tee and zip to efficiently build the result:
from itertools import tee
# python2 only:
#from itertools import izip as zip
def differences(seq):
iterable, copied = tee(seq)
next(copied)
for x, y in zip(iterable, copied):
yield y - x
Or using itertools.islice instead:
from it...
How to set specific java version to Maven
...just recently, after seven long years with Maven, learned about toolchains.xml. Maven has it even documented and supports it from 2.0.9 - toolchains documentation
So I added a toolchain.xml file to my ~/.m2/ folder with following content:
<toolchains xmlns="http://maven.apache.org/TOOLCHAINS/1...
Hex transparency in colors [duplicate]
...specify "hexadecimal number..." every time you write out a number. In your XML, you will still leave that out. Thus a 50% transparent black background will be written in a color.xml file as "#7F000000", as per the #AARRGGBB scheme @erkangur mentioned above.
– Bryan Herbst
...
Numeric for loop in Django templates
... The motivations the Django authors had for disallowing plain python in templates seem pointless and inconsequential compared to the pain and lost time involved in working around not having it, not to mention the need to invent an entirely new langauge when a perfectly awesome one (pyth...
How can I format a decimal to always show 2 decimal places?
...e at times, so I recommend the following, easier readable references:
the Python String Format Cookbook: shows examples of the new-style .format() string formatting
pyformat.info: compares the old-style % string formatting with the new-style .format() string formatting
Python 3.6 introduced litera...
How do I get Flask to run on port 80?
...ured to be passed through to Flask on the WSGI protocol and handled by the Python code. This is the "dynamic" part.
reverse proxy for dynamic content
There are a few advantages to configuring your web server like the above;
SSL Termination - The web server will be optimized to handle HTTPS...
UnicodeDecodeError: 'ascii' codec can't decode byte 0xef in position 1
...l not being set to UTF-8. Here is my terminal
$ echo $LANG
en_GB.UTF-8
$ python
Python 2.7.3 (default, Apr 20 2012, 22:39:59)
[GCC 4.6.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> s = '(\xef\xbd\xa1\xef\xbd\xa5\xcf\x89\xef\xbd\xa5\xef\xbd\xa1)\x...
How to trick an application into thinking its stdout is a terminal, not a pipe
... is amazing. I needed this for an extremely rare use case with an embedded Python library within an executable that is run within Wine. When I ran in a terminal it worked but when I ran the .desktop file I created it would always crash because Py_Initialize didn't see proper stdin/stderr.
...