#python #sicp
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 Summary
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