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What is the use of “assert” in Python?
... errors. The goal of using assertions is to let developers find the likely root cause of a bug more quickly. An assertion error should never be raised unless there’s a bug in your program.
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Defining custom attrs
...lement. If I'm going to use an attr in more than one place I put it in the root element. Note, all attributes share the same global namespace. That means that even if you create a new attribute inside of a <declare-styleable> element it can be used outside of it and you cannot create another a...
What is the difference between a cer, pvk, and pfx file?
... of cryptographic information, including certificates, certificate chains, root authority certificates, and private keys. Its contents can be cryptographically protected (with passwords) to keep private keys private and preserve the integrity of root certificates.
Windows uses .pvk for a private ke...
How can I get the version defined in setup.py (setuptools) in my package?
...ead that file during setup.py.
version_file = open(os.path.join(mypackage_root_dir, 'VERSION'))
version = version_file.read().strip()
The same VERSION file will then work exactly as well in any other program, even non-Python ones, and you only need to change the version string in one place for al...
How does one parse XML files? [closed]
... specific element, you can access child elements with the indexer: xmlDoc["Root"], and these can be chained: xmlDoc["Root"]["Folder"]["Item"] to dig down the hierarchy (although it's sensible to validate that these elements actually exist)
– Jason Williams
Mar ...
Best way to iterate through a Perl array
... #2 is good when you do queues (e.g. breadth-first searches): my @todo = $root; while (@todo) { my $node = shift; ...; push @todo, ...; ...; }
– ikegami
Feb 2 '15 at 14:40
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How to check if a float value is a whole number
I am trying to find the largest cube root that is a whole number, that is less than 12,000.
13 Answers
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海量数据相似度计算之simhash短文本查找 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...快的返回一个value，这个号称查找速度最快的数据结构是如何实现的呢？看下hashmap的内部结构：
如果我们需要得到key对应的value，需要经过这些计算，传入key，计算key的hashcode，得到7的位置；发现7位置对应的value还有好几个，...
What is the best project structure for a Python application? [closed]
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re "tricks": Django adds the parent of the root project folder to the sys.path, so that modules can be imported as either "from project.app.module import klass" or "from app.module import klass".
– Jonathan Hartley
Nov 7 '11 at 7...
How can I view an old version of a file with Git?
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You can use git show with a path from the root of the repository (./ or ../ for relative pathing):
$ git show REVISION:path/to/file
Replace REVISION with your actual revision (could be a Git commit SHA, a tag name, a branch name, a relative commit name, or any oth...