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How to keep environment variables when using sudo
...r setting HTTP_PROXY the command wget works fine without sudo . However if I type sudo wget it says it can't bypass the proxy setting.
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What is “callback hell” and how and why does RX solve it?
... example that explains what is a "callback hell" for someone who does not know JavaScript and node.js ?
8 Answers
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How to sort with a lambda?
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What you have written so far makes little sense. If mProperty is supposed to be an int a.mProperty>b.mProperty will definitely yield a bool.
– sellibitze
Feb 26 '11 at 0:32
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How to print a groupby object
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key_list_from_gb = [key1, key2, key3]
for key, values in gb.items():
if key in key_list_from_gb:
print(df.ix[values], "\n")
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follo...
Wildcards in jQuery selectors
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What if, I want to select the Even of those selected. for instance: I currently have .col-lg-4:even div:nth-child(1) if I wanted to do the same.... what would I write? "[class^=.col-lg-]:even"? (I don't seem to make it work)
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How do you check whether a number is divisible by another number (Python)?
...e if and only if n is an exact multiple of k. In elementary maths this is known as the remainder from a division.
In your current approach you perform a division and the result will be either
always an integer if you use integer division, or
always a float if you use floating point division.
It...
Javascript - removing undefined fields from an object [duplicate]
...key] === undefined && delete obj[key])
jsbin
Same example using if expression:
Object.keys(obj).forEach(key => {
if (obj[key] === undefined) {
delete obj[key];
}
});
If you want to remove the items from nested objects as well, you can use a recursive function:
const removeE...
MongoDB副本集详解 优于以往的主从模式 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...ngodb.org/downloads
实验环境使用的Mongodb版本为mongodb-linux-x86_64-2.6.0
由三台虚拟机搭建，配置为单核,1G内存。实验环境如下:
MongoDB的副本集不同于以往的主从模式。
在集群Master故障的时候，副本集可以自动投票，选举出新的Maste...
System.Threading.Timer in C# it seems to be not working. It runs very fast every 3 second
I've a timer object. I want it to be run every minute. Specifically, it should run a OnCallBack method and gets inactive while a OnCallBack method is running. Once a OnCallBack method finishes, it (a OnCallBack ) restarts a timer.
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How to get JQuery.trigger('click'); to initiate a mouse click
...xpense_tickets value is changed, and also, when page is reload
});
// now we trigger the change event
$("#expense_tickets").trigger("change");
})
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