大约有 6,700 项符合查询结果（耗时：0.0161秒） [XML]
Why exactly is eval evil?
...estion is not specific to LISP. Here is an answer on the same question for PHP, and it applies to LISP, Ruby, and other other language that has an eval:
The main problems with eval() are:
Potential unsafe input. Passing an untrusted parameter is a way to
fail. It is often not a trivial...
What is the meaning of erb?
...
lame, they should remove the html. u don't see html.php
– luckyguy73
Oct 22 '16 at 23:26
add a comment
|
...
“is” operator behaves unexpectedly with integers
...ion that handles creating a new int object is PyLong_FromLong(long v). The description for this function is:
The current implementation keeps an array of integer objects for all integers between -5 and 256, when you create an int in that range you actually just get back a reference to the existi...
How should you build your database from source control?
...mise: All database changes (structure and data) are stored in an XML-based descriptive manner and checked into source control.
The good point, that DML changes are stored semantically, not just diff, so that you could track the purpose of the changes.
It could be combined with GIT version control ...
Does Python have “private” variables in classes?
...
I wonder if PHP has something similar with its goofy private variables - since private variables don't really make sense in interpreted language - I mean what optimization can it do knowing x variable is private, if it is not compiled?
...
How to get the contents of a webpage in a shell variable?
... This is a really neat trick. I invoke a shell script via a php script on a proxy server. When asked, the proxy server turns on expensive servers which shut themselves off after 2 hours. I need the output from wget for standard output to feed back to the Jenkins console record.
...
How to check whether an object has certain method/property?
...much any modern dynamic scripting language (Python, Javascript, VB script, PHP, Lua... I could go on and on). It's not a bug, it's a feature.
– Tim Keating
Dec 3 '11 at 14:36
5
...
Why doesn't the example compile, aka how does (co-, contra-, and in-) variance work?
...istinct possibility), try adding more explanation / context to the problem description and I'll try again.
In response to your edit: Immutable slots are a whole different situation...* smile * I hope the example above helped.
...
Which is the fastest algorithm to find prime numbers?
...tp://primes.utm.edu/prove/prove2_3.html and http://forums.nvidia.com/index.php?showtopic=70483
If you just need a way to generate very big prime numbers and don't care to generate all prime numbers < an integer n, you can use Lucas-Lehmer test to verify Mersenne prime numbers. A Mersenne prime n...
What's the best manner of implementing a social activity stream? [closed]
...ok at getstream.io There are clients available for Node, Python, Rails and PHP.
In addition have a look at this high scalability post were we explain some of the design decisions involved:
http://highscalability.com/blog/2013/10/28/design-decisions-for-scaling-your-high-traffic-feeds.html
This tut...