A user that inputs 1 and 3 into the following code will result in what output?
A user that inputs 1 and 3 into the following code will result in what output?
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
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![### Output of Python Code Manipulating a Tic-Tac-Toe Board
#### Question
A user that inputs 1 and 3 into the following code will result in what output?
#### Code
```python
board = ( ("_", "_", "_"),
("_", "_", "_"),
("_", "_", "_") )
col = int(input("X player, select a column: "))
row = int(input("X player, select a row: "))
col -= 1
row -= 1
board[row][col] = "X"
print(board[0])
print(board[1])
print(board[2])
```
#### Explanation
1. **Initialization**:
The `board` is a 3x3 tuple representing a Tic-Tac-Toe grid initially filled with underscores (`_`).
2. **User Input**:
- `col` is set by the user input for the column.
- `row` is set by the user input for the row.
- In this example, the user inputs 1 (for the column) and 3 (for the row).
3. **Adjustment**:
- Both `col` and `row` are decremented by 1 to accommodate zero-based indexing in Python.
- This means the selections transform as follows: `col = 1 - 1 => 0` and `row = 3 - 1 => 2`.
4. **Update the Board**:
- The `board` is updated at the specified position (row 2, column 0) with an "X".
5. **Printing the Board**:
- The updated `board` is printed row by row.
#### Output
The modified board layout after executing the code with inputs (1, 3) will look like:
```python
['_', '_', '_']
['_', '_', '_']
['X', '_', '_']
```
This shows that the "X" has been placed in the first column of the third row.
#### Visual Output in the Document
```
['_', '_', '_']
['_', '_', '_']
['X', '_', '_']
```
#### Summary
This code effectively allows a player to place an "X" on a Tic-Tac-Toe board based on their input for column and row, adjusting for zero-based indexing. The output reflects the board's state after the player's move.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fa9ed15ea-b247-4d4a-84f5-d7f808a88737%2Feaf9af75-a960-478a-8773-cbb648fd249d%2F57bsf74_processed.jpeg&w=3840&q=75)
Transcribed Image Text:### Output of Python Code Manipulating a Tic-Tac-Toe Board
#### Question
A user that inputs 1 and 3 into the following code will result in what output?
#### Code
```python
board = ( ("_", "_", "_"),
("_", "_", "_"),
("_", "_", "_") )
col = int(input("X player, select a column: "))
row = int(input("X player, select a row: "))
col -= 1
row -= 1
board[row][col] = "X"
print(board[0])
print(board[1])
print(board[2])
```
#### Explanation
1. **Initialization**:
The `board` is a 3x3 tuple representing a Tic-Tac-Toe grid initially filled with underscores (`_`).
2. **User Input**:
- `col` is set by the user input for the column.
- `row` is set by the user input for the row.
- In this example, the user inputs 1 (for the column) and 3 (for the row).
3. **Adjustment**:
- Both `col` and `row` are decremented by 1 to accommodate zero-based indexing in Python.
- This means the selections transform as follows: `col = 1 - 1 => 0` and `row = 3 - 1 => 2`.
4. **Update the Board**:
- The `board` is updated at the specified position (row 2, column 0) with an "X".
5. **Printing the Board**:
- The updated `board` is printed row by row.
#### Output
The modified board layout after executing the code with inputs (1, 3) will look like:
```python
['_', '_', '_']
['_', '_', '_']
['X', '_', '_']
```
This shows that the "X" has been placed in the first column of the third row.
#### Visual Output in the Document
```
['_', '_', '_']
['_', '_', '_']
['X', '_', '_']
```
#### Summary
This code effectively allows a player to place an "X" on a Tic-Tac-Toe board based on their input for column and row, adjusting for zero-based indexing. The output reflects the board's state after the player's move.
![### Understanding Board Outputs in Python
In this tutorial, we will learn how to manipulate and understand outputs of board representations in Python.
#### Example Code
```python
print(board[1])
print(board[2])
```
#### Output Analysis
**Figure 1: Output of Board Manipulation**
```
['-', '-', 'X']
['-', '-', '-']
['-', '-', '-']
```
In Figure 1, this board representation indicates the position of 'X' in the second row (index 1) while the other cells remain empty, represented by '-'.
#### Error Analysis
**Error Scenario 1: Programming Error**
```text
An error when board[row][col] = "X" is executed:
```
**Board State:**
```
['-', 'X', '-']
['-', '-', '-']
['-', '-', '-']
```
This error usually occurs when there is an attempt to assign a new value to a specific position on the board where an invalid index may be provided or the board structure is immutable. The state indicates 'X' placed at the first cell of the second row.
**Error Scenario 2: Structural Error**
```text
An error when board = (('*', '*', '*'),
('*', '*', '*'),
('*', '*', '*')) is executed.
```
This error arises typically when the board is incorrectly defined or mismatched data types are used. The provided structure uses tuples where the indices might not be mutable, which leads to a runtime error during assignment.
This understanding is crucial for debugging and correctly implementing board-based data structures, especially in games or simulation contexts.
**URL Reference:**
[Further Reading on Board Manipulation in Python](https://app.sophia.org/spcc/introduction-to-python-programming-milestone-2-1/9/12635)
#### Visual Explanation
The diagram and examples above represent a typical 3x3 board in a game setting, with empty cells denoted by '-' and active moves marked by 'X'. Proper index handling and structure definition ensure error-free executions.
Using these examples, one can better understand potential pitfalls and the correct methodology for manipulating board structures in Python.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fa9ed15ea-b247-4d4a-84f5-d7f808a88737%2Feaf9af75-a960-478a-8773-cbb648fd249d%2Fsrnbiae_processed.jpeg&w=3840&q=75)
Transcribed Image Text:### Understanding Board Outputs in Python
In this tutorial, we will learn how to manipulate and understand outputs of board representations in Python.
#### Example Code
```python
print(board[1])
print(board[2])
```
#### Output Analysis
**Figure 1: Output of Board Manipulation**
```
['-', '-', 'X']
['-', '-', '-']
['-', '-', '-']
```
In Figure 1, this board representation indicates the position of 'X' in the second row (index 1) while the other cells remain empty, represented by '-'.
#### Error Analysis
**Error Scenario 1: Programming Error**
```text
An error when board[row][col] = "X" is executed:
```
**Board State:**
```
['-', 'X', '-']
['-', '-', '-']
['-', '-', '-']
```
This error usually occurs when there is an attempt to assign a new value to a specific position on the board where an invalid index may be provided or the board structure is immutable. The state indicates 'X' placed at the first cell of the second row.
**Error Scenario 2: Structural Error**
```text
An error when board = (('*', '*', '*'),
('*', '*', '*'),
('*', '*', '*')) is executed.
```
This error arises typically when the board is incorrectly defined or mismatched data types are used. The provided structure uses tuples where the indices might not be mutable, which leads to a runtime error during assignment.
This understanding is crucial for debugging and correctly implementing board-based data structures, especially in games or simulation contexts.
**URL Reference:**
[Further Reading on Board Manipulation in Python](https://app.sophia.org/spcc/introduction-to-python-programming-milestone-2-1/9/12635)
#### Visual Explanation
The diagram and examples above represent a typical 3x3 board in a game setting, with empty cells denoted by '-' and active moves marked by 'X'. Proper index handling and structure definition ensure error-free executions.
Using these examples, one can better understand potential pitfalls and the correct methodology for manipulating board structures in Python.
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