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How to add column if not exists on PostgreSQL?
...lumn already exists, adds if it doesn't and will continue to fail on other errors (like an invalid data type).
I don't recommend doing ANY of these methods if these are random strings coming from external sources. No matter what method you use (client-side or server-side dynamic strings executed as...
Undefined reference to `pow' and `floor'
...ts symbols from object file. You can see that this was compiled without an error, but pow, floor, and printf functions have undefined references, now if I will try to link this to executable:
$ gcc fib.o
fib.o: In function `fibo':
fib.c:(.text+0x57): undefined reference to `pow'
fib.c:(.text+0x84):...
How do I check if there are duplicates in a flat list?
...
It throws me an "invalid syntax" error on the lambda function of decompose()
– raffaem
May 13 '19 at 10:43
...
What does “abstract over” mean?
... The code runs on REPL fine. What version of Scala are you using, and what error did you get?
– Daniel C. Sobral
Jan 22 '11 at 22:47
1
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Force SSL/https using .htaccess and mod_rewrite
...SL-enabled virtual host or directories for defending against configuration errors that expose stuff that should be protected. When this directive is present all requests are denied which are not using SSL.
This will not do a redirect to https though. To redirect, try the following with mod_rewrite...
Render HTML to PDF in Django site
...ue(), content_type='application/pdf')
return HttpResponse('We had some errors<pre>%s</pre>' % escape(html))
Then you can use it like this:
def myview(request):
#Retrieve data or whatever you need
return render_to_pdf(
'mytemplate.html',
{
...
Python loop that also accesses previous and next values
...hole sequence in memory at once at any time.
In python 3, it will show an error while importing izip,you can use zip instead of izip. No need to import zip, it is predefined in python 3 - source
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Should you always favor xrange() over range()?
...cent call last):
File "<stdin>", line 1, in <module>
OverflowError: Python int too large to convert to C long
Python 3 does not have this problem:
Python 3.2.3 (default, Jul 14 2012, 01:01:48)
[GCC 4.7.1] on linux2
Type "help", "copyright", "credits" or "license" for more informati...
How to restart Jenkins manually?
...e just started working with Jenkins and have run into a problem. After installing several plugins it said it needs to be restarted and went into a "shutting down" mode, but never restarts.
...
Iterate a list as pair (current, next) in Python
...(b, None)
return itertools.izip(a, b)
How this works:
First, two parallel iterators, a and b are created (the tee() call), both pointing to the first element of the original iterable. The second iterator, b is moved 1 step forward (the next(b, None)) call). At this point a points to s0 and b...