What will the following program display? def main () : 2. %3D 2.7 print (x, y) change us (x,y) autid (x, y) def change us (8,b): ('e) autzd
What will the following program display? def main () : 2. %3D 2.7 print (x, y) change us (x,y) autid (x, y) def change us (8,b): ('e) autzd
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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Use Python

Transcribed Image Text:### Understanding Python Function Scope: What Will This Program Display?
This Python program explores variable scope and function behavior. Here’s a breakdown of the code:
```python
def main():
x = 2
y = 2.7
print(x, y)
change_us(x, y)
print(x, y)
def change_us(a, b):
a = 0
b = 0
print(a, b)
main()
```
#### Code Explanation
1. **Main Function:**
- **Initialization:** Variables `x` and `y` are initialized with values `2` and `2.7` respectively.
- **First Print Statement:** The program prints the initial values of `x` and `y`.
2. **Function Call:**
- **`change_us` Function:** This is called with `x` and `y` as arguments, passed as `a` and `b`.
- **Variable Reassignment:** Inside `change_us`, `a` and `b` are reassigned to `0`.
- **Second Print Statement:** It prints `0 0` from the local scope of `change_us`.
3. **Return to Main:**
- **Scope Check:** After returning from `change_us`, the main function prints `x` and `y` again.
- **Final Print Statement:** It displays the initial values (`2` and `2.7`). Since Python passes arguments by assignment, changes inside `change_us` do not affect the original variables.
#### Program Output
The output of the program will be:
```
2 2.7
0 0
2 2.7
```
#### Concept Explanation
- **Pass by Assignment:** In Python, variables are passed to functions by assignment. The function receives a copy of the reference to the object. Thus, reassignment inside a function does not modify the original variable in the caller.
- **Local vs. Global Scope:** Changes to `a` and `b` do not affect `x` and `y`, because `a` and `b` are local to `change_us`.
This code is a classic demonstration of local variable scope and parameter passing in Python.
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