PYTHONCall expressions, such as square(2), apply functions to arguments. When executing call expressions, we create a new frame in our diagram to keep track of local variables:Evaluate the operator, which should evaluate to a function.Evaluate the operands from left to right.Draw a new frame, labeling it with the following:A unique index (f1, f2, f3, ...)The intrinsic name of the function, which is the name of the function object itself.For example, if the function object is func square(x)[parent=Global], the intrinsic name is square.The parent frame ([parent=Global])Bind the formal parameters to the argument values obtained in step 2 (e.g. bind x to 3).Evaluate the body of the function in this new frame until a return value is obtained. Write down the return value in the frame. If a function does not have a return value, it implicitly returns None. In that case, the “Return value" box should contain None. Let's put it all together! Draw an environment diagram for the following code.def double(x): return x * 2hmmm = doublewow = double(3)hmmm(wow)

create an environment diagram to visualize how it all unfolds:We initiate with a global frame…

Answered: PYTHON Call expressions, such as…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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PYTHON

Call expressions, such as square(2), apply functions to arguments. When executing call expressions, we create a new frame in our diagram to keep track of local variables:

Evaluate the operator, which should evaluate to a function.
Evaluate the operands from left to right.
Draw a new frame, labeling it with the following:

A unique index (f1, f2, f3, ...)
The intrinsic name of the function, which is the name of the function object itself.
For example, if the function object is func square(x)
[parent=Global], the intrinsic name is square.
The parent frame ([parent=Global])

Bind the formal parameters to the argument values obtained in step 2 (e.g. bind x to 3).
Evaluate the body of the function in this new frame until a return value is obtained. Write down the return value in the frame.

If a function does not have a return value, it implicitly returns None. In that case, the “Return value" box should contain None.

Let's put it all together! Draw an environment diagram for the following code.

def double(x):

return x * 2

hmmm = double

wow = double(3)

hmmm(wow)

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