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#python #sicp
Functions without parent annotations were defined in the global environment. When a user-defined function is called, the frame created has the same parent as that function.
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1.6 Higher-Order Functions
=f1] Function values each have a new annotation that we will include in environment diagrams from now on, a parent. The parent of a function value is the first frame of the environment in which that function was defined. <span>Functions without parent annotations were defined in the global environment. When a user-defined function is called, the frame created has the same parent as that function. Subsequently, the name sqrt_update resolves to this newly defined function, which is passed as an argument to improve . Within the body of improve , we must apply our update fun


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