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How can I determine what font a browser is actually using to render some text?
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Per Wilfred Hughes' answer, Firefox now supports this natively. This article has more details.
This answer original referenced the "Font Finder" plugin, but only because it was from 4 years ago. The fact that old answers linger like this and the community can...
What is the official “preferred” way to install pip and virtualenv systemwide?
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If you can install the latest Python (2.7.9 and up) Pip is now bundled with it.
See: https://docs.python.org/2.7//installing/index.html
If not :
Update (from the release notes):
Beginning with v1.5.1, pip does not require setuptools prior to running get-pip.py. Additionally, if ...
How to calculate time difference in java?
... java.time.Duration;
import java.time.Instant;
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Instant start = Instant.now();
//your code
Instant end = Instant.now();
Duration timeElapsed = Duration.between(start, end);
System.out.println("Time taken: "+ timeElapsed.toMillis() +" milliseconds");
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What is an existential type?
...X they're saying: You can plug in whatever type you want, I don't need to know anything about the type to do my job, I'll only refer to it opaquely as X.
When someone defines an existential type ∃X they're saying: I'll use whatever type I want here; you wont know anything about the type, so you c...
Sample random rows in dataframe
... sample_frac) have been superseded by slice_sample, though they remain for now.
– Matt_B
Sep 4 at 2:50
add a comment
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JavaScript closures vs. anonymous functions
...ree variable.
That free variable is called an upvalue of the closure F.
Now let's use this to figure out who uses closures and who doesn't (for the sake of explanation I have named the functions):
Case 1: Your Friend's Program
for (var i = 0; i < 10; i++) {
(function f() {
var i2...
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]...
How to implement common bash idioms in Python? [closed]
...I just discovered how to combine the best parts of bash and ipython. Up to now this seems more comfortable to me than using subprocess and so on. You can easily copy big parts of existing bash scripts and e.g. add error handling in the python way :)
And here is my result:
#!/usr/bin/env ipython3
#...
Complex CSS selector for parent of active child [duplicate]
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The CSS Selectors 4 spec has now included the ability for selectors to ascend. stackoverflow.com/q/1014958/392
– Dan Herbert
Nov 22 '11 at 17:22
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How to detect if app is being built for device or simulator in Swift
In Objective-C we can know if an app is being built for device or simulator using macros:
20 Answers
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