要将DWG文件转换为JSON，可以使用Autodesk Forge API。下面是使用Autodesk Forge Design Automation API的示例代码：

import requests

def convert_dwg_to_json(input_dwg_path, output_json_path):
    # Forge API endpoint for Design Automation
    api_url = "https://developer.api.autodesk.com/autocad.io/us-east/v2/WorkItems"

    # Input and output file paths
    input_file = {"inputFile": input_dwg_path}
    output_file = {"outputFile": output_json_path}

    # Work item payload
    payload = {
        "activityId": "YourActivityId",
        "arguments": {
            "InputArguments": [input_file],
            "OutputArguments": [output_file]
        }
    }

    # Forge API headers
    headers = {
        "Content-Type": "application/json",
        "Authorization": "Bearer YourForgeAccessToken"
    }

    # Send the request to Forge API
    response = requests.post(api_url, headers=headers, json=payload)

    if response.status_code == 201:
        print("Conversion successful!")
    else:
        print("Conversion failed with status code:", response.status_code)

# Example usage
convert_dwg_to_json("input.dwg", "output.json")

请注意，上述示例代码仅演示了如何将DWG文件转换为JSON，其中的"YourActivityId"和"YourForgeAccessToken"需要替换为你自己的Autodesk Forge相关参数。此外，还需要进行身份验证和授权以访问Autodesk Forge API。有关详细信息，请参阅Autodesk Forge API文档。