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Android应用开发性能优化完全分析 - 更多技术 - 清泛网 - 专注C/C++及内核技术
Android应用开发性能优化完全分析1 背景其实有点不想写这篇文章的，但是又想写，有些矛盾。不想写的原因是随便上网一搜一堆关于性能的建议，感觉大家你一总结、我一总结的...1 背景
其实有点不想写这篇文章的，但是又想...
Very large matrices using Python and NumPy
NumPy is an extremely useful library, and from using it I've found that it's capable of handling matrices which are quite large (10000 x 10000) easily, but begins to struggle with anything much larger (trying to create a matrix of 50000 x 50000 fails). Obviously, this is because of the massive memo...
How to get file creation & modification date/times in Python?
...on date in a cross-platform way is easy - just call os.path.getmtime(path) and you'll get the Unix timestamp of when the file at path was last modified.
Getting file creation dates, on the other hand, is fiddly and platform-dependent, differing even between the three big OSes:
On Windows, a file'...
How to delete a file or folder?
...os.rmdir() removes an empty directory.
shutil.rmtree() deletes a directory and all its contents.
Path objects from the Python 3.4+ pathlib module also expose these instance methods:
pathlib.Path.unlink() removes a file or symbolic link.
pathlib.Path.rmdir() removes an empty directory.
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JavaFX and OpenJDK
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JavaFX is part of OpenJDK
The JavaFX project itself is open source and is part of the OpenJDK project.
Update Dec 2019
For current information on how to use Open Source JavaFX, visit https://openjfx.io. This includes instructions on using JavaFX as a modular library accessed from an exist...
How to get the CPU Usage in C#?
...e properties of processes, but I only want the CPU usage of the processes, and the total CPU like you get in the TaskManager.
...
Rename multiple files in a directory in Python [duplicate]
... Im getting an error from windows saying it cant find the file, and it's not doing anything...any tips?
– Jeff
May 3 '10 at 15:49
5
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How can I read command line parameters from an R script?
I've got a R script for which I'd like to be able to supply several command-line parameters (rather than hardcode parameter values in the code itself). The script runs on Windows.
...
How to access environment variable values?
...
print(os.environ.get('KEY_THAT_MIGHT_EXIST'))
# os.getenv is equivalent, and can also give a default value instead of `None`
print(os.getenv('KEY_THAT_MIGHT_EXIST', default_value))
Python default installation on Windows is C:\Python. If you want to find out while running python you can do:
impo...
What is the iPad user agent?
...is using iPhone OS, but with a different screen resolution from the iPhone and iPod touch. So many sites may have to change their user agent detection to adapt to the iPad.
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