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What is the best way to ensure only one instance of a Bash script is running? [duplicate]
...st way to ensure only one instance of a given script is running - assuming it's Bash on Linux?
14 Answers
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Saving a Numpy array as an image
I have a matrix in the type of a Numpy array. How would I write it to disk it as an image? Any format works (png, jpeg, bmp...). One important constraint is that PIL is not present.
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Why is parenthesis in print voluntary in Python 2.7?
...int is actually a special statement and not a function*.
This is also why it can't be used like: lambda x: print x
Note that (expr) does not create a Tuple (it results in expr), but , does. This likely results in the confusion between print (x) and print (x, y) in Python 2.7
(1) # 1 -- no tuple...
Displaying better error message than “No JSON object could be decoded”
...dule is vague. For instance, for the case of having a comma after the last item in a list:
json.loads('[1,2,]')
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ValueError: No JSON object could be decoded
which is not very descriptive. The same operation with simplejson:
simplejson.loads('[1,2,]')
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simplejson.decoder.JSONDecodeError: E...
Converting Long to Date in Java returns 1970
I have list with long values (for example: 1220227200, 1220832000, 1221436800...) which I downloaded from web service. I must convert it to Dates. Unfortunately this way, for example:
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Javascript “this” pointer within nested function
... the above examples the this object will be someThing.
Calling a function without a leading parent object will generally get you the global object which in most browsers means the window object.
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Make Bootstrap Popover Appear/Disappear on Hover instead of Click
I'm building a website with Bootstrap's Popover and I can't figure out how to make the popover appear on hover instead of click.
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How can I keep Bootstrap popovers alive while being hovered?
...trap popover to create a hover card showing user info, and I am triggering it on mouseover of a button. I want to keep this popover alive while the popover itself is being hovered, but it disappears as soon as the user stops hovering over the button. How can I do this?
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python generator “send” function purpose?
Can someone give me an example of why the "send" function associated with Python generator function exists? I fully understand the yield function. However, the send function is confusing to me. The documentation on this method is convoluted:
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How to check a radio button with jQuery?
I try to check a radio button with jQuery. Here's my code:
32 Answers
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