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Showing a different background colour in Vim past 80 characters
...n Vim window open with the leftmost 80 columns using the normal background and anything past that using a slightly different background. The Vim window background should be a different color, not just text that goes over the 80 character point. This would indicate how close I am getting to the 80-ch...
How to update a git clone --mirror?
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This is the command that you need to execute on the mirror:
git remote update
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Couldn't connect to server 127.0.0.1:27017
...mongodb is terminating because there is an old lock file.
If you are not and were not running with journaling, remove the lock file, run repair, and start mongodb again.
If you are or were running with journaling turned on, see the relevant Mongo DB docs. Note that they say "If you are running wi...
Python OpenCV2 (cv2) wrapper to get image size?
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cv2 uses numpy for manipulating images, so the proper and best way to get the size of an image is using numpy.shape. Assuming you are working with BGR images, here is an example:
>>> import numpy as np
>>> import cv2
>>> img = cv2.imread('foo.jpg')
&g...
What Vim command(s) can be used to quote/unquote words?
How can I quickly quote/unquote words and change quoting (e.g. from ' to " ) in Vim? I know about the surround.vim plugin, but I would like to use just Vim.
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Thread.Sleep replacement in .NET for Windows Store
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Windows Store apps embrace asynchrony - and an "asynchronous pause" is provided by Task.Delay. So within an asynchronous method, you'd write:
await Task.Delay(TimeSpan.FromSeconds(30));
... or whatever delay you want. The asynchronous method will continue 30 sec...
Why does “pip install” inside Python raise a SyntaxError?
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pip is run from the command line, not the Python interpreter. It is a program that installs modules, so you can use them from Python. Once you have installed the module, then you can open the Python shell and do import selenium.
The Python shell is...
How do you delete a column by name in data.table?
...the following will remove column foo from the data.table df3:
# Method 1 (and preferred as it takes 0.00s even on a 20GB data.table)
df3[,foo:=NULL]
df3[, c("foo","bar"):=NULL] # remove two columns
myVar = "foo"
df3[, (myVar):=NULL] # lookup myVar contents
# Method 2a -- A safe idiom for excl...
proper hibernate annotation for byte[]
I have an application using hibernate 3.1 and JPA annotations. It has a few objects with byte[] attributes (1k - 200k in size). It uses the JPA @Lob annotation, and hibernate 3.1 can read these just fine on all major databases -- it seems to hide the JDBC Blob vendor peculiarities (as it should do...
How do I capture SIGINT in Python?
I'm working on a python script that starts several processes and database connections. Every now and then I want to kill the script with a Ctrl + C signal, and I'd like to do some cleanup.
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