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分布式系统的事务处理 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...一个很难的问题。 让我们用最经典的Use Case：“A帐号向B帐号汇钱”来说明一下，熟悉RDBMS事务的都知道从帐号A到帐号B需要6个操作：
从A帐号中把余额读出来。
对A帐号做减法操作。
把结果写回A帐号中。
从B帐号中把余额读...
Suppress/ print without b' prefix for bytes in Python 3
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Smart Manoj
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answered May 25 '13 at 9:14
sdaausdaau
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Is the Scala 2.8 collections library a case of “the longest suicide note in history”? [closed]
I have just started to look at the Scala collections library re-implementation which is coming in the imminent 2.8 release. Those familiar with the library from 2.7 will notice that the library, from a usage perspective, has changed little. For example...
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Better way to shuffle two numpy arrays in unison
I have two numpy arrays of different shapes, but with the same length (leading dimension). I want to shuffle each of them, such that corresponding elements continue to correspond -- i.e. shuffle them in unison with respect to their leading indices.
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How to flatten nested objects with linq expression
I am trying to flatten nested objects like this:
4 Answers
4
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Default function arguments in Rust
Is it possible in Rust to create a function with a default argument?
6 Answers
6
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Remove HTML tags from a String
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Use a HTML parser instead of regex. This is dead simple with Jsoup.
public static String html2text(String html) {
return Jsoup.parse(html).text();
}
Jsoup also supports removing HTML tags against a customizable whitelist, which is very useful if you want to allow only e.g. <b>, <i...
Selecting with complex criteria from pandas.DataFrame
...pd.DataFrame({'A': [randint(1, 9) for x in range(10)],
'B': [randint(1, 9)*10 for x in range(10)],
'C': [randint(1, 9)*100 for x in range(10)]})
>>> df
A B C
0 9 40 300
1 9 70 700
2 5 70 900
3 8 80 900
4 7 50 200
5 9 30 900
6 ...
What exactly does git's “rebase --preserve-merges” do (and why?)
Git's documentation for the rebase command is quite brief:
2 Answers
2
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new keyword in method signature
...le performing a refactoring, I ended up creating a method like the example below. The datatype has been changed for simplicity's sake.
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