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Difference between namespace in C# and package in Java
...her source file:
package n1.n2;
class B {}
Package cannot be nested. One source file can only have one package statement.
C#
Namespaces are used to organize programs, both as an "internal" organization system for a program, and as an "external" organization system.
System.Security.Cryptogra...
Creating an R dataframe row-by-row
I would like to construct a dataframe row-by-row in R. I've done some searching, and all I came up with is the suggestion to create an empty list, keep a list index scalar, then each time add to the list a single-row dataframe and advance the list index by one. Finally, do.call(rbind,) on the list...
Renaming a branch while on pull request
On Github, you can make pull requests to add functionality to a project. One's contributions have to be on a branch that, if the request is accepted, will be merged into the master branch (or an analogous one) of the project.
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Execute code when Django starts ONCE only?
... hook for this
Don't do it this way.
You don't want "middleware" for a one-time startup thing.
You want to execute code in the top-level urls.py. That module is imported and executed once.
urls.py
from django.confs.urls.defaults import *
from my_app import one_time_startup
urlpatterns = ......
Python argparse: Make at least one argument required
...est='mode')
args = parser.parse_args()
if not args.mode:
parser.error("One of --process or --upload must be given")
Though, probably it would be a better idea to use subcommands instead.
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How to get the nth element of a python list or a default if not available
...valent in python of dictionary.get(key, default) for lists. Is there any one liner idiom to get the nth element of a list or a default value if not available?
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Drop unused factor levels in a subsetted data frame
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That's fine for a one-off, but in a data.frame with a large number of columns, you get to do that on every column that is a factor ... leading to the need for a function such as drop.levels() from gdata.
– Dirk Eddelbuett...
Pythonic way to create a long multi-line string
... string if I had the\n energy to type more and more ...'
Finally, one can also construct long lines in Python like this:
s = ("this is a very"
"long string too"
"for sure ..."
)
which will not include any extra blanks or newlines (this is a deliberate example showing wh...
Express next function, what is it really for?
...ode should check a database for a page with a certain id slug. If it finds one render it! if it doesn't find one then ignore this route handler and check for other ones.
So next() with no arguments allows to pretend you didn't handle the route so that something else can pick it up instead.
Or a ...
MySQL combine two columns into one column
I'm trying to find a way to combine two columns into one, but keep getting the value '0' in the column instead to the combination of the words.
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