Running shell command and capturing the output

pythonshellsubprocess
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Windows path in Python

pythonpathstring-literals
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What exactly do "u" and "r" string prefixes do, and what are raw string literals?

pythonunicodepython-2.xrawstring
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Evaluating a mathematical expression in a string

mathpython
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Why do I get AttributeError: 'NoneType' object has no attribute 'something'?

pythonnonetypeattributeerror
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