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What is an idempotent operation?
...d f is an operation that may mutate that object. For example, consider the Python set and its discard method. The discard method removes an element from a set, and does nothing if the element does not exist. So:
my_set.discard(x)
has exactly the same effect as doing the same operation twice:
my_...
How does “do something OR DIE()” work in PHP?
... And here I was, thinking this was some kind of advanced feature like python's with statement, when it's actually just a boolean expression... I think extra care should be taken when using this expression if you're expected to perform a cleanup in case of errors. Please, correct me if I'm wrong...
Can I run multiple programs in a Docker container?
...cker container. It states a specific use case which is the deployment of a Python application along with a MongoDB database. And, for that use case, the best recommendation is to discourage the usage of a single container and recommend the usage of docker-compose.
– nicolas-van...
How to set up Spark on Windows?
...d add %SCALA_HOME%\bin in PATH variable in environment variables.
Install Python 2.6 or later from Python Download link.
Download SBT. Install it and set SBT_HOME as an environment variable with value as <<SBT PATH>>.
Download winutils.exe from HortonWorks repo or git repo. Since we d...
How to log cron jobs?
... The binaries can be found using the locate command, for example:
$locate python
Be sure that the binary you will refer, is the very same the binary you are calling in your shell, or simply test again in your shell using the absolute path that you plan to put in the cronjob.
Another common sour...
Getting distance between two points based on latitude/longitude
...focuses just on answering the specific bug OP ran into.
It's because in Python, all the trig functions use radians, not degrees.
You can either convert the numbers manually to radians, or use the radians function from the math module:
from math import sin, cos, sqrt, atan2, radians
# approxima...
How to break out of a loop from inside a switch?
...e default behaviour (a difficult task using an embedded switch and goto).
Python Example
Contrast the following answer (to a Python question) that was posted on StackOverflow:
Loop forever.
Ask the user to input their choice.
If the user's input is 'restart', continue looping forever.
Otherwise,...
Where are an UIWebView's cookies stored?
... the .binarycookies directly, you can run a script:
Download and install Python
Download BinaryCookieReader.py
Run "Python BinaryCookieReader.py" on the terminal
as you can see, output log contains detail cookies description
...
What is the minimum valid JSON?
...e "JSON text", but was amended to accept any "JSON value" in version 5.2.1
Python's json.loads accepts any "JSON value" according to examples on this manual page
the validator at http://jsonlint.com expects a full "JSON text"
the Ruby JSON module will only accept a full "JSON text" (at least accordi...
What Java ORM do you prefer, and why? [closed]
...d it works great. I think the difference might be in the dynamic nature of python (and perl). Using an ORM in Java is a pain. But in dynamic languages it can be really expressive. There are some great projects to embed ORM operations like DSLs in Python and are great.
– santiag...