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Disable assertions in Python

...trate each. For the whole process Using the -O flag (capital O) disables all assert statements in a process. For example: $ python -Oc "assert False" $ python -c "assert False" Traceback (most recent call last): File "<string>", line 1, in <module> AssertionError Note that by di...
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How to ALTER multiple columns at once in SQL Server

.... Each statement means a new scan but if you could alter multiple columns, all altering could have been much quicker – erikkallen Sep 8 '16 at 6:31 ...
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Force SSL/https using .htaccess and mod_rewrite

...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 in your .htaccess file RewriteEngine On RewriteCond %{HTTPS} !=on RewriteRule ^ ...
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How does Bluebird's util.toFastProperties function make an object's properties “fast”?

... eval("o" + o); // ensure no dead code elimination } Sans one or two small optimizations - all the below is still valid. Let's first discuss what it does and why that's faster and then why it works. What it does The V8 engine uses two object representations: Dictionary mode - in which object ar...
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What are some (concrete) use-cases for metaclasses?

...a couple functions I found that I was able to increment the figure count, call draw manually, etc, but I needed to do these before and after every plotting call. So to create both an interactive plotting wrapper and an offscreen plotting wrapper, I found it was more efficient to do this via metacla...
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What is the difference between require_relative and require in Ruby?

... the docs: require_relative complements the builtin method require by allowing you to load a file that is relative to the file containing the require_relative statement. For example, if you have unit test classes in the "test" directory, and data for them under the test "test/data" directo...
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What do the terms “CPU bound” and “I/O bound” mean?

...U (doing calculations). A program that computes new digits of π will typically be CPU-bound, it's just crunching numbers. A program is I/O bound if it would go faster if the I/O subsystem was faster. Which exact I/O system is meant can vary; I typically associate it with disk, but of course networ...
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find vs find_by vs where

... Use whichever one you feel suits your needs best. The find method is usually used to retrieve a row by ID: Model.find(1) It's worth noting that find will throw an exception if the item is not found by the attribute that you supply. Use where (as described below, which will return an empty arr...
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Django, creating a custom 500/404 error page

... for some reason request.user appears fine in the 404 template, but not at all in the 500 template (and they are almost identical) -- posted question on this here: stackoverflow.com/questions/26043211/… – Gravity Grave Sep 25 '14 at 16:13 ...
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Find current directory and file's directory [duplicate]

...tive to the current working directory and is not changed by an os.chdir() call.) To get the current working directory use import os cwd = os.getcwd() Documentation references for the modules, constants and functions used above: The os and os.path modules. The __file__ constant os.path.rea...