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Wikipedia: CLU (programming language)

Wikipedia: Python (programming language)

Wikipedia: Lock (computer science)

Anchor text: "Simple Top-Down Parsing in Python" (2008) by Fredrik Lundh

Wikipedia: Operator-precedence parser

Anchor text: D. Writing Your Own File Decoder

Wikipedia: Python Imaging Library

Wikipedia: Evaluation strategy

Anchor text: this article

Wikipedia: Wikipedia:Reference desk/Archives/Computing/2008 May 22

Anchor text: Thread Synchronization Mechanisms in Python

Wikipedia: Event (synchronization primitive)