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We require two extensions to our environment model to enable lexical scoping. Each user-defined function has a parent environment: the environment in which it was defined. When a user-defined function is called, its local frame extends its parent environment.

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1.6 Higher-Order Functions
enclosing function sqrt . This discipline of sharing names among nested definitions is called lexical scoping. Critically, the inner functions have access to the names in the environment where they are defined (not where they are called). <span>We require two extensions to our environment model to enable lexical scoping. Each user-defined function has a parent environment: the environment in which it was defined. When a user-defined function is called, its local frame extends its parent environment. Previous to sqrt , all functions were defined in the global environment, and so they all had the same parent: the global environment. By contrast, when Python evaluates the first tw

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status	not learned	measured difficulty	37% [default]	last interval [days]
repetition number in this series	0	memorised on		scheduled repetition
scheduled repetition interval		last repetition or drill

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