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How do I merge two dictionaries in a single expression in Python (taking union of dictionaries)?
...ard-compatible code, and you want this in a single expression, the most performant while correct approach is to put it in a function:
def merge_two_dicts(x, y):
"""Given two dictionaries, merge them into a new dict as a shallow copy."""
z = x.copy()
z.update(y)
return z
and then you...
What are the most interesting equivalences arising from the Curry-Howard Isomorphism?
...lies that for every programming concept there exists a precise analogue in formal logic, and vice versa. Here's a "basic" list of such analogies, off the top of my head:
...
HTML5 best practices; section/header/aside/article elements
There is enough information about HTML5 on the web (and also on stackoverflow), but now I'm curious about the "best practices". Tags like section/headers/article are new, and everyone has different opinions about when/where you should use these tags. So what do you guys think of the following layout...
LINGO使用指南 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...数系数的允许变化范围：x1的系数为（72-8，72+24）=（64，96）；x2的系数为（64-16，64+8）=（48，72）。注意：x1系数的允许范围需要x2系数64不变，反之亦然。由于目标函数的费用系数变化并不影响约束条件，因此此时最优基不变可...
Why are C# 3.0 object initializer constructor parentheses optional?
...It poses no problems for the sort of "partial program" analysis that is performed by the IDE's "IntelliSense" engine while you are typing. And so on.
the feature hits a common "sweet spot" for the larger object initialization feature; typically if you are using an object initializer it is precisely...
Long-lasting FB access-token for server to pull FB page info
...t infinite. Also the Acces Token Debugger has a link at the bottom of the form to extend a short-lived access token to a long-lived access token.
– SlimIT
Oct 9 '15 at 2:22
...
Why shouldn't all functions be async by default?
...erations are not high latency, so it doesn't make any sense to take the performance hit that mitigates that latency. Rather, a key few of your operations are high latency, and those operations are causing the zombie infestation of async throughout the code.
if performance is the sole problem, s...
#define macro for debug printing in C?
... DEBUG_TEST where I used DEBUG.
If you insist on a string literal for the format string (probably a good idea anyway), you can also introduce things like __FILE__, __LINE__ and __func__ into the output, which can improve the diagnostics:
#define debug_print(fmt, ...) \
do { if (DEBUG) fpri...
What is Ember RunLoop and how does it work?
...order in which these actions (binding, rendering DOM elements, etc) are performed is determined by the Ember.run.queues array described above:
The run loop will start off on the first queue, which is sync. It'll run all of the actions that were scheduled into the sync queue by the Ember.run code. Th...
Why all the Active Record hate? [closed]
...accessing data without primary keys, with things that violate first normal form, where there are lots of stored procedures required to access the data, you are better off using something that is more of just a SQL wrapper. If your database is relatively well structured, ActiveRecord lets you take a...