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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)
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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### 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.
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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