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Find intersection of two nested lists?
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OceanBase使用libeasy原理源码分析：服务器端 - 数据库(内核) - 清泛网 - ...
...：
一、OceanBase启动时的使用模式
二、 基础数据结构
2.1 easy_list_t
2.2 easy_pool_t
2.3 easy_buf_t
2.4 easy_connection_t
三、 连接建立
四、 同步处理(OceanBase少量使用这种模式)
五、 异步处理(OceanBase大量采用这种模式)
六、 资源...
How do you echo a 4-digit Unicode character in Bash?
... crossbones to my shell prompt (specifically the 'SKULL AND CROSSBONES' (U+2620)), but I can't figure out the magic incantation to make echo spit it, or any other, 4-digit Unicode character. Two-digit one's are easy. For example, echo -e "\x55", .
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How to form tuple column from two columns in Pandas
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Get comfortable with zip. It comes in handy when dealing with column data.
df['new_col'] = l...
Returning the product of a list
...tor import mul
reduce(mul, list, 1)
it is better and faster. With python 2.7.5
from operator import mul
import numpy as np
import numexpr as ne
# from functools import reduce # python3 compatibility
a = range(1, 101)
%timeit reduce(lambda x, y: x * y, a) # (1)
%timeit reduce(mul, a) ...
How to convert a string of numbers to an array of numbers?
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My 2 cents for golfers:
b="1,2,3,4".split`,`.map(x=>+x)
backquote is string litteral so we can omit the parenthesis (because of the nature of split function) but it is equivalent to split(','). The string is now an array, ...
Python JSON serialize a Decimal object
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edited Sep 1 at 14:12
Dewald Abrie
1,12355 silver badges1919 bronze badges
answered Dec 25 '09 at ...
Python element-wise tuple operations like sum
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我帮儿子用App Inventor 2给遥控车装了"蓝牙大脑"，手机一划车就...
...能让它跑。"看着他期待的眼神，我决定用App Inventor 2的蓝牙组件试试。没想到两小时就搞定了，而且连接稳定性和操控体验远超预期。
需求分析
儿子想要的是：手机屏幕上显示方向键，手指滑动时遥控车前进、后退、...
What's the difference between KeyDown and KeyPress in .NET?
... not directly result in calls to KeyPress:
Shift, Ctrl, Alt
F1 through F12
Arrow keys
Examples of keys that do result in calls to KeyPress:
A through Z, 0 through 9, etc.
Spacebar
Tab (KeyChar='\t', ASCII 9)
Enter (KeyChar='\r', ASCII 13)
Esc (KeyChar='\x1b', ASCII 27)
Backspace (KeyChar='\b',...