What this snippet does
Using shell=True with string interpolation exposes the system to shell injection attacks; always use lists.
Expected output
Always use list arguments
Why practise typing this
Typing standard library (subprocess) code builds muscle memory for the symbols and indentation Python uses most, which prose-based typing tests never cover. DevType measures your words per minute and accuracy on this snippet and tracks the individual characters you mistype, so later lessons can target them.
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