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Associativity of “in” in Python?
... 3 (())
6 COMPARE_OP 6 (in) # perform 1 in []
9 LOAD_CONST 2 ('a') # now load 'a'
12 COMPARE_OP 6 (in) # compare result of (1 in []) with 'a'
# throws...
Rails render partial with block
....
Create your partial on shared/_modal.html.erb:
<div class="ui modal form">
<i class="close icon"></i>
<div class="header">
<%= heading %>
</div>
<div class="content">
<%= capture(&block) %>
</div>
<div class="action...
Discard all and get clean copy of latest revision?
...
In any case, there is no single one command you can ask Mercurial to perform that will do everything you want here, except if you change the process to that "full clone" method that you say you can't do.
share
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“Uncaught TypeError: Illegal invocation” in Chrome
...xchange.using('gps', function() { StackExchange.gps.track('embedded_signup_form.view', { location: 'question_page' }); });
$window.unbind('scroll', onScroll);
}
};
...
SQLAlchemy: cascade delete
...and the one I recommend, is built into your database and usually takes the form of a constraint on the foreign key declaration. In PostgreSQL it looks like this:
CONSTRAINT child_parent_id_fkey FOREIGN KEY (parent_id)
REFERENCES parent_table(id) MATCH SIMPLE
ON DELETE CASCADE
This means that when y...
When should I choose Vector in Scala?
...er-than-trivial sized sequences. See this documentation of the relative performance of Vector compared to the other collections. There are some downsides to going with Vector. Specifically:
Updates at the head are slower than List (though not by as much as you might think)
Another downside befo...
Passing an Array as Arguments, not an Array, in PHP
...sition in the array, not their keys.
As per CarlosCarucce's comment, this form of argument unpacking is the fastest method by far in all cases. In some comparisons, it's over 5x faster than call_user_func_array.
Aside
Because I think this is really useful (though not directly related to the quest...
How do I disable a Pylint warning?
...use this is a strange exception and needs to be called out, basically as a form of documentation.
Like everything else in Python, you can act at different levels of indirection. My advice is to think about what belongs at what level so you don't end up with a too-lenient approach to Pylint.
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Pip freeze vs. pip list
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$ pip install -r requirements.txt
The packages need to be in a specific format for pip to understand, which is
feedparser==5.1.3
wsgiref==0.1.2
django==1.4.2
...
That is the "requirements format".
Here, django==1.4.2 implies install django version 1.4.2 (even though the latest is 1.6.x).
If ...
Surrogate vs. natural/business keys [closed]
...are NOT NULL UNIQUE) then you are likely in violation of Boyce-Codd Normal Form. BCNF is beyond 3NF, so not many people worry about it. There are situations, however, where being in BCNF is very helpful.
– Alan
Sep 17 '08 at 17:19
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