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How to deal with persistent storage (e.g. databases) in Docker
...ta"
web:
restart: on-failure:10
build: .
command: gunicorn mypythonapp.wsgi:application -b :8000 --reload
volumes:
- .:/code
ports:
- "8000:8000"
links:
- db
volumes:
db-data:
As far as I can understand: This will create a data volume container (db_da...
What is an intuitive explanation of the Expectation Maximization technique? [closed]
...escribed above.
Example: estimating mean and standard deviation
I'll use Python in this example, but the code should be fairly easy to understand if you're not familiar with this language.
Suppose we have two groups, red and blue, with the values distributed as in the image above. Specifically, ...
How to open a file for both reading and writing?
...s the contents of string to the file, returning
None.
Also if you open Python tutorial about reading and writing files you will find that:
'r+' opens the file for both reading and writing.
On Windows, 'b' appended to the mode opens the file in binary mode, so
there are also modes lik...
Hash function that produces short hashes?
...e result to the desired length, which may be good enough.
For example, in Python:
>>> import hashlib
>>> hash = hashlib.sha1("my message".encode("UTF-8")).hexdigest()
>>> hash
'104ab42f1193c336aa2cf08a2c946d5c6fd0fcdb'
>>> hash[:10]
'104ab42f11'
...
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...