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Efficiently test if a port is open on Linux?
From a bash script how can I quickly find out whether a port 445 is open/listening on a server.
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How to access pandas groupby dataframe by key
How do I access the corresponding groupby dataframe in a groupby object by the key?
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How do I kill background processes / jobs when my shell script exits?
I am looking for a way to clean up the mess when my top-level script exits.
13 Answers
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Calculating frames per second in a game
What's a good algorithm for calculating frames per second in a game? I want to show it as a number in the corner of the screen. If I just look at how long it took to render the last frame the number changes too fast.
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Join a list of strings in python and wrap each string in quotation marks
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How to change border color of textarea on :focus
Forgive me is this is a stupid question, but i need help.
I want to change border color of TEXTAREA on focus. but my code doesn't seem to working properly.
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Difference between pre-increment and post-increment in a loop?
Is there a difference in ++i and i++ in a for loop? Is it simply a syntax thing?
22 Answers
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Get a pixel from HTML Canvas?
Is it possible to query a HTML Canvas object to get the color at a specific location?
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Why am I seeing “TypeError: string indices must be integers”?
I'm playing with both learning python and trying to get github issues into a readable form. Using the advice on How can I convert JSON to CSV? I came up with this:
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In JavaScript, why is “0” equal to false, but when tested by 'if' it is not false by itself?
The following shows that "0" is false in Javascript:
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