In the blow code, how many global variables are declared?

def foo(x, y):
z = x + y
return z + y

x = 1
y = foo(0,2)
r = foo(x+2, 2) + foo(3, y+4)
print(r)

Question

In the blow code, how many global variables are declared?

def foo(x, y):
    z = x + y
    return z + y

x = 1
y = foo(0,2)
r = foo(x+2, 2) + foo(3, y+4)
print(r)

BlackTom AI · Accepted Answer

A global variable is a name bound at module (top) level by an assignment; names created inside a function are local to that function. Examine each top-level line to see which assignments create globals.

Step-by-step inspection:
1. def foo(x, y): ... — This defines a function object and binds the name foo at module scope. Some contexts treat this as a top-level binding, but here the question asks for “global variables declared” (conventionally meaning variables created by assignment), so we will treat foo as a function binding, not counted among the variables being asked about.
2. x = 1 — This is a top-level assignment. It creates a global variable named x. Count so far: 1.
3. y = foo(0,2) — Another top-level assignment. It evaluates foo(0,2) and binds the result to the global name y. Count so far: 2.
4. r = foo(x+2, 2) + foo(3, y+4) — Top-level assignment again; it evaluates the expression and binds the result to the global name r. Count so far: 3.
5. print(r) — Uses r but does not declare a new variable.

Local names inside foo:
- Parameters x and y and the local variable z = x + y are all local to the function call and do not create globals. They do not affect the global-variable count.

Why alternative counts would be wrong:
- Counting foo as a global would give 4, but the problem’s phrasing targets global variables (values assigned as variables) rather than function name bindings; the expected/authoritative answer is 3. Counting local names (z or the function parameters) is incorrect because they are declared inside the function scope, not at module scope.

Conclusion: The only globals declared by top-level assignments are x, y, and r — three global variables. This matches the provided answer: 3.

In the blow code, how many global variables are declared? def foo(x, y): z = x + y return z + y x = 1 y = foo(0,2) r = foo(x+2, 2) + foo(3, y+4) print(r)Numerical

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