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内容
System你的任务是根据提供的自然语言请求创建 Python 函数。这些请求将描述函数所需的功能，包括输入参数和预期的返回值。根据给定的规格实现这些函数，确保它们能处理边缘情况，执行必要的验证，并遵循 Python 编程的最佳实践。请在代码中包含适当的注释来解释逻辑，并帮助其他开发者理解实现。
User我想要一个可以解决数独谜题的函数。该函数应该接收一个 9x9 的数独网格作为输入，其中空白单元格用数值 0 表示。该函数应该使用回溯算法解决谜题并返回已解决的网格。如果谜题无法解决，它应该返回 None。该函数还应该验证输入网格，确保它是一个有效的数独谜题。

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示例输出

Python
def solve_sudoku(grid):
   def is_valid(row, col, num):
       # Check if the number is valid in the current row and column
       for i in range(9):
           if grid[row][i] == num or grid[i][col] == num:
               return False

       # Check if the number is valid in the current 3x3 subgrid
       start_row, start_col = (row // 3) * 3, (col // 3) * 3
       for i in range(3):
           for j in range(3):
               if grid[start_row + i][start_col + j] == num:
                   return False

       return True

   def backtrack(row, col):
       # If we have filled all cells, the puzzle is solved
       if row == 9:
           return True

       # Move to the next row if we have reached the end of the current row
       if col == 9:
           return backtrack(row + 1, 0)

       # If the current cell is already filled, move to the next cell
       if grid[row][col] != 0:
           return backtrack(row, col + 1)

       # Try filling the current cell with numbers from 1 to 9
       for num in range(1, 10):
           if is_valid(row, col, num):
               grid[row][col] = num
               if backtrack(row, col + 1):
                   return True
               grid[row][col] = 0

       # If no valid number is found, backtrack
       return False

   # Validate the input grid
   if not all(len(row) == 9 and all(0 <= cell <= 9 for cell in row) for row in grid):
       return None

   # Start the backtracking algorithm
   if backtrack(0, 0):
       return grid
   else:
       return None

​
API 请求

import anthropic

client = anthropic.Anthropic(  # defaults to os.environ.get("ANTHROPIC_API_KEY")
    api_key="my_api_key",
)
message = client.messages.create(
    model="claude-opus-4-20250514",
    max_tokens=1000,
    temperature=0,
    system="Your task is to create Python functions based on the provided natural language requests. The requests will describe the desired functionality of the function, including the input parameters and expected return value. Implement the functions according to the given specifications, ensuring that they handle edge cases, perform necessary validations, and follow best practices for Python programming. Please include appropriate comments in the code to explain the logic and assist other developers in understanding the implementation.",
    messages=[
        {
            "role": "user",
            "content": [
                {
                    "type": "text",
                    "text": "I want a function that can solve a Sudoku puzzle. The function should take a 9x9 Sudoku grid as input, where empty cells are represented by the value 0. The function should solve the puzzle using a backtracking algorithm and return the solved grid. If the puzzle is unsolvable, it should return None. The function should also validate the input grid to ensure it is a valid Sudoku puzzle.",
                }
            ],
        }
    ],
)
print(message.content)