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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/...
...
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]...
Trouble comparing time with RSpec
...sides of your expectation
expect(@article.updated_at.utc.to_s).to eq(Time.now.to_s)
or
expect(@article.updated_at.utc.to_i).to eq(Time.now.to_i)
Refer to this for more information about why the times are different
shar...
JSON datetime between Python and JavaScript
...ime.datetime, datetime.date))
else None
)
json.dumps(datetime.datetime.now(), default=date_handler)
'"2010-04-20T20:08:21.634121"'
Which is ISO 8601 format.
A more comprehensive default handler function:
def handler(obj):
if hasattr(obj, 'isoformat'):
return obj.isoformat()
...
Aren't Python strings immutable? Then why does a + “ ” + b work?
...able, a, which points to the string, is mutable.
Consider:
a = "Foo"
# a now points to "Foo"
b = a
# b points to the same "Foo" that a points to
a = a + a
# a points to the new string "FooFoo", but b still points to the old "Foo"
print a
print b
# Outputs:
# FooFoo
# Foo
# Observe that b hasn't...
Iterate over object attributes in python
...ppens if I just harmlessly add an attribute to the class, a name, say, and now all of a sudden it gets included.
– Julian
Jul 24 '12 at 19:16
3
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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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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...
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).
...
__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.
...