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Selecting only numeric columns from a data frame
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296
EDIT: updated to avoid use of ill-advised sapply.
Since a data frame is a list we can use th...
maxlength ignored for input type=“number” in Chrome
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22 Answers
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How do I use Maven through a proxy?
...ings ([maven install]/conf/settings.xml), or user settings (${user.home}/.m2/settings.xml) is configured correctly. It is better to do this in your user settings to avoid storing the password in plain text in a public location.
Maven 2.1 introduced password encryption, but I've not got round to che...
服务器保持大量TIME_WAIT和CLOSE_WAIT的解决方法 - C/C++ - 清泛网 - 专注C/C++及内核技术
...：
TIME_WAIT 814
CLOSE_WAIT 1
FIN_WAIT1 1
ESTABLISHED 634
SYN_RECV 2
LAST_ACK 1
常用的三个状态是：ESTABLISHED 表示正在通信，TIME_WAIT 表示主动关闭，CLOSE_WAIT 表示被动关闭。
具体每种状态什么意思，其实无需多说，看看下面这种图就明白...
Revert the `--no-site-packages` option with virtualenv
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162
Try removing (or renaming) the file no-global-site-packages.txt in your Lib folder under your vi...
Are “elseif” and “else if” completely synonymous?
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When does invoking a member function on a null instance result in undefined behavior?
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How to generate a random string of a fixed length in Go?
...olution is perfect. This is if performance does matter. Although the first 2 steps (Bytes and Remainder) might be an acceptable compromise: they do improve performance by like 50% (see exact numbers in the II. Benchmark section), and they don't increase complexity significantly.
Having said that, ...
python multithreading wait till all threads finished
... asked in a similar context but I was unable to find an answer after about 20 minutes of searching, so I will ask.
8 Answer...
Python unittests in Jenkins?
...ample tests:
tests.py:
# tests.py
import random
try:
import unittest2 as unittest
except ImportError:
import unittest
class SimpleTest(unittest.TestCase):
@unittest.skip("demonstrating skipping")
def test_skipped(self):
self.fail("shouldn't happen")
def test_pass(sel...