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MongoDB: Combine data from multiple collections into one..how?
...collection called users_comments that contains the merged data and you can now use that. These reduced collections all have _id which is the key you were emitting in your map functions and then all of the values are a sub-object inside the value key - the values aren't at the top level of these red...
How to get current timestamp in milliseconds since 1970 just the way Java gets
...;
milliseconds ms = duration_cast< milliseconds >(
system_clock::now().time_since_epoch()
);
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Save classifier to disk in scikit-learn
...digits.data, digits.target)
0.9526989426822482
Edit: in Python 3.8+ it's now possible to use pickle for efficient pickling of object with large numerical arrays as attributes if you use pickle protocol 5 (which is not the default).
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Error in finding last used cell in Excel with VBA
... It is highly unreliable. Try this experiment.
Type something in cell A5. Now when you calculate the last row with any of the methods given below, it will give you 5. Now color the cell A10 red. If you now use the any of the below code, you will still get 5. If you use Usedrange.Rows.Count what do ...
Differences between lodash and underscore [closed]
...ast 3 Backbone boilerplates that include Lo-Dash by default and Lo-Dash is now mentioned in Backbone’s official documentation.
Check out Kit Cambridge's post, Say "Hello" to Lo-Dash, for a deeper breakdown on the differences between Lo-Dash and Underscore.
Footnotes:
Underscore has inconsisten...
Guava equivalent for IOUtils.toString(InputStream)
...ByteSource, CharSource, ByteSink and CharSink. Given a ByteSource, you can now get its contents as a String like this:
ByteSource source = ...
String text = source.asCharSource(Charsets.UTF_8).read();
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搭建高可用mongodb集群（二）—— 副本集 - 大数据 & AI - 清泛网 - 专注C/...
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rs.initiate(config);
#输出成功
{
"info" : "Config now saved locally. Should come online in about a minute.",
"ok" : 1
}
#查看日志，副本集启动成功后，138为主节点PRIMARY，136、137为副本节点SECONDARY。
Sun Dec 29 20:26:13.842 [conn3]...
__proto__ VS. prototype in JavaScript
...s: "This will work if f.__proto__ = g where g is the base class." I don't know if this has some meaning i don't understand, but if you were to add the properties and methods in that way, then when you used the new keyword to create an instance, the properties and methods wouldn't be copied over.
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Is there a TRY CATCH command in Bash
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May I know how to log the exception? Normally in java code, we can use system.out.log(e), but how about in shell?
– Panadol Chong
Feb 13 '19 at 6:57
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What is a clean, pythonic way to have multiple constructors in Python?
I can't find a definitive answer for this. As far as I know, you can't have multiple __init__ functions in a Python class. So how do I solve this problem?
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