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App Inventor 2 MultiImagePicker 拓展：实现图片/视频多选功能 - App Inve...
App Inventor 2 MultiImagePicker 拓展：实现图片/视频多选功能
App Inventor 2 原生提供的 ImagePicker（图像选择器）组件只能一次选择一张图片，在实际开发中经常需要一次选取多张图片（比如发帖、上传相册等场景）。MultiImagePicker 拓展...
Logical operators (“and”, “or”) in DOS batch
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12 Answers
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Query EC2 tags from within instance
Amazon recently added the wonderful feature of tagging EC2 instances with key-value pairs to make management of large numbers of VMs a bit easier.
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how to return index of a sorted list? [duplicate]
...the sorted items in the list. For example, if the list I want to sort is [2,3,1,4,5] , I need [2,0,1,3,4] to be returned.
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Showing the same file in both columns of a Sublime Text window
When I have 2 columns set in a Sublime Text window, can I display the same file in both columns?
9 Answers
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Understanding how recursive functions work
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2
I'm not too happy with thinking of it as a copy. I find that a more intuitive explanation is to differentiate the function itself (the code,...
Go > operators
...sibly over) simplified definition is just that << is used for "times 2" and >> is for "divided by 2" - and the number after it is how many times.
So n << x is "n times 2, x times". And y >> z is "y divided by 2, z times".
For example, 1 << 5 is "1 times 2, 5 times" or...
What's the difference between a proc and a lambda in Ruby?
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262
One difference is in the way they handle arguments. Creating a proc using proc {} and Proc.new...
Secondary axis with twinx(): how to add to legend?
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You can easily add a second legend by adding the line:
ax2.legend(loc=0)
You'll get this:
But if you want all labels on one legend then you should do something like this:
import numpy as np
import matplotlib.pyplot as plt
from matplotlib import rc
rc('mathtext', default='regu...
How to pass command line arguments to a rake task
... Rake::Task["thing:work"].invoke(*args)
end
end
Then
rake thing:work[1,2,3]
=> work: {:option=>"1", :foo=>"2", :bar=>"3"}
rake thing:another[1,2,3]
=> another {:option=>"1", :foo=>"2", :bar=>"3"}
=> work: {:option=>"1", :foo=>"2", :bar=>"3"}
NOTE: variable ...