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Linux C/C++进程单实例互斥代码分享 - C/C++ - 清泛网 - 专注C/C++及内核技术
Linux C/C++进程单实例互斥代码分享linux-process-singleton分享一段LinuxC C++程序只能启动一份实例的实现代码，原理是通过文件锁互斥实现，最重要的是考虑了不同用户运行同一程序互斥的场景，已经过充分的测试，可直接用于实际项...
Converting strings to floats in a DataFrame
How to covert a DataFrame column containing strings and NaN values to floats. And there is another column whose values are strings and floats; how to convert this entire column to floats.
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How to read integer value from the standard input in Java
...can also tokenize input with regular expression, etc. The API has examples and there are many others in this site (e.g. How do I keep a scanner from throwing exceptions when the wrong type is entered?).
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log4j configuration via JVM argument(s)?
...o I have to set/pass as arguments to the JVM to get log4j to run properly? And by properly I mean not complain and print to the console. Can I see a typical example?
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Which browsers support ?
..., allowing them to load async with a "hack" (although a pretty solid one), and also allows rendering the page without waiting for ga.js to be retrieved.
The second part only affects compatible browsers that understand the async html attribute
FF 3.6+
FF for Android All Versions
IE 10+ ...
Efficiently checking if arbitrary object is NaN in Python / numpy / pandas?
...lues. As I iterate over the data set, I need to detect such missing values and handle them in special ways.
2 Answers
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Print JSON parsed object?
...splay the object in the console as a collapsed tree. You can open the tree and inspect the object.
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Converting camel case to underscore case in ruby
...ls so you can't call underscore by default, but by providing the code used and citing rails as the source this answer is a good one for ruby, It says you can include rails, or just include this function that the rails team wrote and have tested.
– Michael Gorman
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Why is lazy evaluation useful?
... You can actually emulate an infinite list in Python using generators and generator expressions (which work in a similar way to a list comprehension): python.org/doc/2.5.2/ref/genexpr.html
– John Montgomery
Nov 5 '08 at 15:11
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Find integer index of rows with NaN in pandas dataframe
I have a pandas DataFrame like this:
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