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How do I check if a string is a number (float)?
...nversion function has two kinds of results
A number, if the number is valid
A status code (e.g., via errno) or exception to show that no valid number could be parsed.
C (as an example) hacks around this a number of ways. Python lays it out clearly and explicitly.
I think your code for doing th...
Postgres dump of only parts of tables for a dev snapshot
...tps://www.postgresql.org/docs/current/static/sql-copy.html
You should consider maintaining a set of development data rather than just pulling a subset of your production. In the case that you're writing unit tests, you could use the same data that is required for the tests, trying to hit all of th...
How to make a Java Generic method static?
...e with each other.
So, what does this mean:
In my answer <E> would hide the E from ArrayUtils<E> if the method wouldn't be static. AND <E> has nothing to do with the E from ArrayUtils<E>.
To reflect this fact better, a more correct answer would be:
public static <I> ...
Why does Typescript use the keyword “export” to make classes and interfaces public?
...ould argue that "they should have used "export" instead of "public", but asides from "export/private/protected" being a poorly matched set of access modifiers, I believe there is a subtle difference between the two that explains this.
In TypeScript, marking a class member as public or private has n...
json_encode() escaping forward slashes
...487 (archived copy).
Example Demo
<?php
/*
* Escaping the reverse-solidus character ("/", slash) is optional in JSON.
*
* This can be controlled with the JSON_UNESCAPED_SLASHES flag constant in PHP.
*
* @link http://stackoverflow.com/a/10210433/367456
*/
$url = 'http://www.example.co...
How can I check whether a numpy array is empty or not?
... This is great for numpy, but is unfortunate that it is considered unpythonic for lists. Check out discussion for lists: stackoverflow.com/questions/53513/… It would be nice to use same pattern for numpy arrays and lists.
– eric
Jul 28 '19 at...
How to create a static library with g++?
...
@unapersson: No. I'm saying exactly what I said. Executables are no longer produced in a.out format, but the name remains for legacy reasons. (And if you're incapable of using a shell properly then that's your problem; I for one know how to run an executable from the cu...
Git log to get commits only for a specific branch
...using git cherry, is that commits are only matched if their file diffs are identical between branches. If any sort of merging was done which would make the diffs different between one branch, and the other, then git cherry sees them as different commits.
– Ben
...
Write to UTF-8 file in Python
...
This didn't work for me, Python 3 on Windows. I had to do this instead with open(file_name, 'wb') as bomfile: bomfile.write(codecs.BOM_UTF8) then re-open the file for append.
– Dustin Andrews
...
Insert new column into table in sqlite?
...SELECT query and you will get the order of columns, as paxdiablo already said:
SELECT name, colnew, qty, rate FROM{tablename}
and in my opinion, your column name to get the value from the cursor:
private static final String ColNew="ColNew";
String val=cursor.getString(cursor.getColumnIndex(ColN...