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Any reason not to use '+' to concatenate two strings?
... = s + t, other Python implementations may not.
CPython implementation detail: If s and t are both strings, some
Python implementations such as CPython can usually perform an in-place
optimization for assignments of the form s = s + t or s += t. When
applicable, this optimization makes qua...
What kinds of patterns could I enforce on the code to make it easier to translate to another program
...ot an AST. Be wary of the difference.
Now, since Python's ASTs are quite detailed, given an AST the front-end job isn't terribly hard. I suppose you can have a simple prototype for some parts of the functionality ready quite quickly. However, getting to a complete solution will take more time, mai...
Which Eclipse files belong under version control?
...ion of the eclipse metadata. But this option, if checked, will remove your detailed launch parameters!)
project-dir/.project
project-dir/.classpath
project-dir/.settings/*
should be in your SCM (especially .project and .classpath according to the Eclipse documentation).
The goal is that anyone ...
SQL update fields of one table from fields of another one
... introduced with Postgres 8.2 in 2006, long before the question was asked. Details in the manual.
Related:
Bulk update of all columns
With list of columns in B
If all columns of A are defined NOT NULL (but not necessarily B),
and you know the column names of B (but not necessarily A).
UPDATE b
SET...
Loop through an array of strings in Bash?
...g like: echo $databaseName
done
See Bash Loops for, while and until for details.
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Determine a user's timezone
... of the current daylight saving time rule for their local time zone. More details on that here.
Ultimately, a better approach is to actually ask your user for their time zone. Provide a setting that they can change. You can use one of the above options to choose a default setting, but don't mak...
How do I exit the Vim editor?
...t writes even read-only files. :wqa[ll]!* for all windows.
:x[it], ZZ(with details). Write the file only if it was changed and quit, :xa[ll]* for all windows.
Discard changes and quit:
:q[uit]! ZQ* Quit without writing, also when visible buffers have changes. Does not exit when there are change...
How to make Twitter Bootstrap menu dropdown on hover rather than click
...o CSS and I suggest looking at how the :after pseudo element works in more detail. To get you started on your way to understanding, to target and remove the arrows in the twitter bootstrap example, you would use the following CSS selector and code:
a.menu:after, .dropdown-toggle:after {
content...
Utility classes are evil? [closed]
...ract this functionality to separate module.
Here is small, but important detail. Class/module you have written is not called HolidayUtil, but PolishHolidayCalculator. Functionally it is a util class, but we have managed to avoid generic word.
...
Execute command on all files in a directory
...pted/high-voted answers are great, but they are lacking a few nitty-gritty details. This post covers the cases on how to better handle when the shell path-name expansion (glob) fails, when filenames contain embedded newlines/dash symbols and moving the command output re-direction out of the for-loop...