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Can existing virtualenv be upgraded gracefully?
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63
You can use the Python 2.6 virtualenv to "revirtual" the existing directory. You will have to re...
Forced naming of parameters in Python
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223
In Python 3 - Yes, you can specify * in the argument list.
From docs:
Parameters after “*...
Is there a Python equivalent to Ruby's string interpolation?
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Python 3.6 will add literal string interpolation similar to Ruby's string interpolation. Starting with that version of Python (which is scheduled to be released by the end of 2016), you will be able to include expressions in "f-str...
搭建高可用mongodb集群（四）—— 分片 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...高可用的mongodb集群：
首先确定各个组件的数量，mongos 3个， config server 3个，数据分3片 shard server 3个，每个shard 有一个副本一个仲裁也就是 3 * 2 = 6 个，总共需要部署15个实例。这些实例可以部署在独立机器也可以部署在一台机...
What is the difference between “text” and new String(“text”)?
...his is very peculiar, and is rarely the intention.
References
JLS 15.21.3 Reference Equality Operators == and !=
class Object - boolean Object(equals)
Related issues
Java String.equals versus ==
How do I compare strings in Java?
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How do I list all versions of a gem available at a remote site?
...c --remote --all
Which returns:
*** REMOTE GEMS ***
rhc (0.84.15, 0.84.13, 0.83.9, 0.82.18, 0.81.14, 0.80.5, 0.79.5, 0.77.8, 0.75.9, 0.74.6, 0.74.5, 0.73.14, 0.72.29, 0.71.2, 0.69.6, 0.69.3, 0.68.5)
rhcp (0.2.18, 0.2.17, 0.2.16, 0.2.15, 0.2.14, 0.1.9, 0.1.8, 0.1.7, 0.1.6, 0.1.5, 0.1.4, 0.1.3, 0.1...
Getting a 404 from WMSvc via MSDeploy.exe
...Richard SzalayRichard Szalay
76.6k1818 gold badges163163 silver badges217217 bronze badges
2
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Changing column names of a data frame
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Use the colnames() function:
R> X <- data.frame(bad=1:3, worse=rnorm(3))
R> X
bad worse
1 1 -2.440467
2 2 1.320113
3 3 -0.306639
R> colnames(X) <- c("good", "better")
R> X
good better
1 1 -2.440467
2 2 1.320113
3 3 -0.306639
You can also...
Can you 'exit' a loop in PHP?
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213
You are looking for the break statement.
$arr = array('one', 'two', 'three', 'four', 'stop', 'f...