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2023年1月12日签到记录贴 - 灌水吐槽、新手试贴 - 清泛IT论坛，有思想、有深度
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What is the python “with” statement designed for?
...anup tasks in so-called context managers. More details can be found in PEP 343. For instance, the open statement is a context manager in itself, which lets you open a file, keep it open as long as the execution is in the context of the with statement where you used it, and close it as soon as you le...
Convert base-2 binary number string to int
... int('11111111', 2)
255
Here is documentation for python2, and for python3.
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What is the difference between const_iterator and non-const iterator in the C++ STL?
... Magnus AndermoMagnus Andermo
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Why can I use auto on a private type?
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The rules for auto are, for the most part, the same as for template type deduction. The example ...
Reorder levels of a factor without changing order of values
...f <- data.frame(f = 1:4, g = letters[1:4])
df
# f g
# 1 1 a
# 2 2 b
# 3 3 c
# 4 4 d
levels(df$g)
# [1] "a" "b" "c" "d"
df$g <- factor(df$g, levels = letters[4:1])
# levels(df$g)
# [1] "d" "c" "b" "a"
df
# f g
# 1 1 a
# 2 2 b
# 3 3 c
# 4 4 d
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使用App Inventor扩展实现多点触控：Rotation Detector 旋转检测 · App Inventor 2 中文网
...App Inventor 扩展实现多点触控：旋转检测器
草稿（2016 年 3 月 6 日）：构建扩展需要 App Inventor 扩展 功能，该功能尚未纳入 App Inventor 版本。但您可以尝试一些 ofary AI2 服务器。
您可以使用扩展测试发送 (2) 实现下面第 2 部分中...
How to load all modules in a folder?
...les = glob.glob(join(dirname(__file__), "*.py"))
__all__ = [ basename(f)[:-3] for f in modules if isfile(f) and not f.endswith('__init__.py')]
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How do I read configuration settings from Symfony2 config.yml?
...as Greenshields
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