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What is the best regular expression to check if a string is a valid URL?

How can I check if a given string is a valid URL address? 55 Answers 55 ...
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Regular expression that matches valid IPv6 addresses

I'm having trouble writing a regular expression that matches valid IPv6 addresses, including those in their compressed form (with :: or leading zeros omitted from each byte pair). ...
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How to test valid UUID/GUID?

How to check if variable contains valid UUID/GUID identifier? 12 Answers 12 ...
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Apply multiple functions to multiple groupby columns

The docs show how to apply multiple functions on a groupby object at a time using a dict with the output column names as the keys: ...
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Dynamically update values of a chartjs chart

I created an basic bar chart using chartjs and it works fine. Now I want to update the values on a time based interval. My problem is that after I created the chart, I do not know how to update its values correctly... ...
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How to find list intersection?

actual output: [1,3,5,6] expected output: [1,3,5] 11 Answers 11 ...
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Why are these numbers not equal?

The following code is obviously wrong. What's the problem? 6 Answers 6 ...
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What is a regular expression which will match a valid domain name without a subdomain?

I need to validate a domain name: 20 Answers 20 ...
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How to pretty-print a numpy.array without scientific notation and with given precision?

I'm curious, whether there is any way to print formatted numpy.arrays , e.g., in a way similar to this: 14 Answers ...