Bring Your Logic using Python
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Logic building using Python : Materials, links, e-books and Code snippets
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Data Science Cheat Sheet - Python Regular Expressions.pdf
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Cheatsheet of Python Regular Expressions

Regular expressions are a powerful language for matching text patterns. A special sequence of characters helps us match or find other strings or sets of strings, using a specialized syntax held in a pattern. The power of python regular expressions is that they can specify patterns, not just fixed characters.

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#Python default argument values are evaluated once so mutability can bite you, use "None" instead.
The id of the passed in list does not change: