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What is tail recursion?
...he running_total is updated.
Note: The original answer used examples from Python. These have been changed to JavaScript, since Python interpreters don't support tail call optimization. However, while tail call optimization is part of the ECMAScript 2015 spec, most JavaScript interpreters don't supp...
Differences between Emacs and Vim
...Vim has a lot of weird levels to its programmability, with the addition of Python and Ruby bindings (and more, I forget), Vim is also programmable in most ways you'd care for.
I use Vim, and I'm fairly happy with it.
share
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Convert a timedelta to days, hours and minutes
...s) dates in a log file are monotonous. See How can I subtract a day from a python date? that may have to deal with similar issues.
– jfs
May 9 '15 at 10:34
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Mod in Java produces negative numbers [duplicate]
When I calculate int i = -1 % 2 I get -1 in Java. In Python, I get 1 as the result of -1 % 2 .
What do I have to do to get the same behavior in Java with the modulo function?
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开源跳板机(堡垒机)Jumpserver v2.0.0 使用说明 - 开源 & Github - 清泛网 ...
...跳板机(堡垒机)Jumpserver v2.0.0 使用说明Jumpserver 是一款由python编写开源的跳板机(堡垒机)系统，实现了跳板机应有的功能。基于ssh协议来管理，客户端无需安装agent。 支持常见系统:
CentOS, RedHat, Fedora, Amazon Linux
Debian
SUSE, Ubuntu
Fre...
How do I get logs/details of ansible-playbook module executions?
....167] => (item=htop,vim-tiny,curl,git,unzip,update-motd,ssh-askpass,gcc,python-dev,libxml2,libxml2-dev,libxslt-dev,python-lxml,python-pip)
stdout:
Reading package lists...
Building dependency tree...
Reading state information...
libxslt1-dev is already the newest version.
0 upgraded, 0 newly ins...
LEGO EV3 机器人按键控制 · App Inventor 2 中文网
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功能增强
传感器反馈：添加EV3传感器数据读取功能
路径记录：记录机器人移动轨迹
速度显示：实时显示电机转速
多机器人控制：支持同时控制多个EV3设备
界面优化
图形化控制：添...
Replacing instances of a character in a string
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Strings in python are immutable, so you cannot treat them as a list and assign to indices.
Use .replace() instead:
line = line.replace(';', ':')
If you need to replace only certain semicolons, you'll need to be more specific. You co...
How To Check If A Key in **kwargs Exists?
Python 3.2.3. There were some ideas listed here , which work on regular var's, but it seems **kwargs play by different rules... so why doesn't this work and how can I check to see if a key in **kwargs exists?
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how does multiplication differ for NumPy Matrix vs Array classes?
...ally I find it more trouble than it's worth, though.
For arrays (prior to Python 3.5), use dot instead of matrixmultiply.
E.g.
import numpy as np
x = np.arange(9).reshape((3,3))
y = np.arange(3)
print np.dot(x,y)
Or in newer versions of numpy, simply use x.dot(y)
Personally, I find it much mo...