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Use curly braces to initialize a Set in Python
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There are two obvious issues with the set literal syntax:
my_set = {'foo', 'bar', 'baz'}
It's not available before Python 2.7
There's no way to express an empty set using that syntax (using {} creates an empty dict)
Those may or may not be important to you.
The section of the ...
A cron job for rails: best practices?
...nt tasks (esp. where you want to avoid the Rails environment startup cost) my preferred approach is to use system cron to call a script that will either (a) poke a secure/private webhook API to invoke the required task in the background or (b) directly enqueue a task on your queuing system of choice...
When do you use varargs in Java?
...to pass in any number of objects.
String.format("This is an integer: %d", myInt);
String.format("This is an integer: %d and a string: %s", myInt, myString);
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Does PNG contain EXIF data like JPG?
...hey is there any documentation that says that? cause i need a proof to let my supervisor know as i am working on an project that requires me to read the EXIF info for png. If that is the case, i could show him and let him know about it
– user1004413
Mar 4 '12 a...
Why can't Python find shared objects that are in directories in sys.path?
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Thanks. My LD_LIBRARY_PATH was not set, so: $ LD_LIBRARY_PATH=/usr/local/lib $LD_LIBRARY_PATH /usr/local/lib But I still get the same error: $ python -c "import pycurl" Traceback (most recent call last): File...
HTML input textbox with a width of 100% overflows table cells
...works with just a single div with right margin 6. However, in the case of my web application, only the above solution works.
<table style="background-color: blue; width: 100%;" cellpadding="0" cellspacing="0">
<tr>
<td style="background-color: red; padding: 3px;">
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Test whether a Ruby class is a subclass of another class
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Hmm, strange syntax (wouldn't have been my first guess), but thanks for the clarification!
– Brian Armstrong
Oct 26 '12 at 1:31
2
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Rails: How do I create a default value for attributes in Rails activerecord's model? [duplicate]
...to this question.
In Rails 3.0 you want to do something like this:
class MyModel < ActiveRecord::Base
after_initialize :default_values
private
def default_values
self.name ||= "default value"
end
end
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How to use filter, map, and reduce in Python 3
...better fix" is to use a list comprehension instead - like [Foo(x) for x in mylist]. This doesn't lead to adding list() everywhere and longer term may be better. (@javadba FYI)
– dmonopoly
Nov 13 '19 at 15:52
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How to make layout with rounded corners..?
...n I make a layout with rounded corners? I want to apply rounded corners to my LinearLayout .
18 Answers
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