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Remove substring from the string
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Ruby 2.5+
If your substring is at the beginning of in the end of a string, then Ruby 2.5 has introduced the methods for this:
delete_prefix for removing a substring from the beginning of the string
delete_suffix for removing a ...
Inline labels in Matplotlib
...2**2, label="0.5x*x"); plt.plot(x2, -1*x2**2, label="-x*x"); plt.plot(x2, -2.5*x2**2, label="-2.5*x*x"); my_legend(); This puts one of the labels in the upper left corner. Any ideas on how to fix this? Seems like the problem may be that the lines are too close together.
– egpbo...
BLE协议—广播和扫描 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...的时间。范围是4 ~ 16384单位是0.625ms，所以实际的时间是2.5ms ~10.24s。
扫描间隔（scan interval）：一次扫描窗口开始，到下一次扫描窗口开始的时间。范围是4 ~ 16384单位是0.625ms，所以实际的时间是2.5ms ~10.24s。
如果扫描窗口=...
vim line numbers - how to have them on by default?
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vim .vimrc and add the commands you want at open.
Here's a site that explains the vimrc and how to use it.
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Dictionary vs Object - which is more efficient and why?
...r i in range(1000000):
all[i] = Obj(i, [])
Run benchmark (using CPython 2.5):
$ lshw | grep product | head -n 1
product: Intel(R) Pentium(R) M processor 1.60GHz
$ python --version
Python 2.5
$ time python test_obj.py && time python test_dict.py && time python test_slots....
Read only the first line of a file?
...he file again when the block ends.
The with statement only works in Python 2.5 and up, and in Python 2.5 you need to use from __future__ import with_statement
In Python 3 you should specify the file encoding for the file you open. Read more...
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Multiple working directories with Git?
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Git 2.5 proposes since July 2015 a replacement for contrib/workdir/git-new-workdir: git worktree
See commit 68a2e6a by Junio C Hamano (gitster).
The release note mentions:
A replacement for contrib/workdir/git-new-workdir that d...
Include all existing fields and add new fields to document
...ddFields is new in MongoDB 3.4 which is supported by the C# driver version 2.5+
– styvane
Jul 17 '18 at 0:59
I have be...
how does multiplication differ for NumPy Matrix vs Array classes?
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The main reason to avoid using the matrix class is that a) it's inherently 2-dimensional, and b) there's additional overhead compared to a "normal" numpy array. If all you're doing is linear algebra, then by all means, feel free t...
Which version of Python do I have installed?
...dline.html#generic-options
--version may also work (introduced in version 2.5)
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