要查看CAD文件的装配体属性，可以使用Autodesk Forge的Design Automation API和Model Derivative API来实现。下面是一个使用Autodesk Forge的Python代码示例：

首先，您需要使用Design Automation API将CAD文件转换为可视化格式（如SVF）。然后使用Model Derivative API获取转换后的可视化模型信息，其中包含装配体属性。最后，您可以使用转换后的可视化模型来查看和获取装配体属性。

下面是一个使用Python和Autodesk Forge SDK的示例代码：

import requests
import json

# Forge credentials
client_id = 'YOUR_CLIENT_ID'
client_secret = 'YOUR_CLIENT_SECRET'

# Get access token
auth_url = 'https://developer.api.autodesk.com/authentication/v1/authenticate'
auth_data = {
    'client_id': client_id,
    'client_secret': client_secret,
    'grant_type': 'client_credentials',
    'scope': 'data:read'
}
auth_response = requests.post(auth_url, data=auth_data)
auth_token = auth_response.json()['access_token']

# Design Automation API
da_url = 'https://developer.api.autodesk.com/autocad.io/us-east/v2/WorkItems'
da_headers = {
    'Content-Type': 'application/json',
    'Authorization': f'Bearer {auth_token}'
}
da_payload = {
    'activityId': 'YOUR_ACTIVITY_ID',
    'arguments': {
        'input': {
            'url': 'YOUR_CAD_FILE_URL'
        },
        'output': {
            'destination': {
                'region': 'us'
            },
            'formats': [
                {
                    'type': 'svf',
                    'views': ['3d']
                }
            ]
        }
    }
}
da_response = requests.post(da_url, headers=da_headers, json=da_payload)
da_response.raise_for_status()
da_response_json = da_response.json()
work_item_id = da_response_json['id']

# Wait for Design Automation job to complete
while True:
    work_item_url = f'{da_url}/{work_item_id}'
    work_item_response = requests.get(work_item_url, headers=da_headers)
    work_item_response.raise_for_status()
    work_item_status = work_item_response.json()['status']

    if work_item_status == 'succeeded':
        break
    elif work_item_status == 'failed':
        raise Exception('Design Automation job failed')

    time.sleep(1)

# Model Derivative API
md_url = 'https://developer.api.autodesk.com/modelderivative/v2/designdata/job'
md_headers = {
    'Content-Type': 'application/json',
    'Authorization': f'Bearer {auth_token}'
}
md_payload = {
    'input': {
        'urn': 'YOUR_SVF_FILE_URN'
    },
    'output': {
        'formats': [
            {
                'type': 'metadata'
            }
        ]
    }
}
md_response = requests.post(md_url, headers=md_headers, json=md_payload)
md_response.raise_for_status()
md_response_json = md_response.json()
metadata_urn = md_response_json['urn']

# Get metadata properties
metadata_url = f'https://developer.api.autodesk.com/modelderivative/v2/designdata/{metadata_urn}/metadata'
metadata_response = requests.get(metadata_url, headers=md_headers)
metadata_response.raise_for_status()
metadata_response_json = metadata_response.json()

# Print assembly properties
assembly_properties = metadata_response_json['data']['metadata'][0]['children'][0]['properties']
for prop in assembly_properties:
    print(f'{prop["displayName"]}: {prop["displayValue"]}')

请确保替换代码中的YOUR_CLIENT_ID、YOUR_CLIENT_SECRET、YOUR_ACTIVITY_ID、YOUR_CAD_FILE_URL和YOUR_SVF_FILE_URN为您自己的凭据和文件信息。

此代码示例使用Design Automation API将CAD文件转换为SVF格式，然后使用Model Derivative API获取转换后的可视化模型的元数据，包括装配体属性。最后，代码以属性的形式打印出来。

请注意，您需要在Autodesk Forge开发者门户上注册并创建应用程序，获取您的客户端ID和客户端密钥，并设置适当的权限和范围。