以下是使用Python和Autodesk Forge API发布职位，并将文件存储在存储桶中并获得正确的URN的示例代码：

import requests
import json

# 定义Forge API的凭证和参数
client_id = 'YOUR_CLIENT_ID'
client_secret = 'YOUR_CLIENT_SECRET'
bucket_name = 'YOUR_BUCKET_NAME'
object_name = 'YOUR_FILE_NAME'

# 获取访问令牌
def get_access_token():
    url = 'https://developer.api.autodesk.com/authentication/v1/authenticate'
    payload = {
        'client_id': client_id,
        'client_secret': client_secret,
        'grant_type': 'client_credentials',
        'scope': 'data:read data:write data:create data:search bucket:create bucket:delete'
    }
    response = requests.post(url, data=payload)
    access_token = json.loads(response.text)['access_token']
    return access_token

# 创建存储桶
def create_bucket():
    url = 'https://developer.api.autodesk.com/oss/v2/buckets'
    headers = {
        'Authorization': 'Bearer ' + get_access_token(),
        'Content-Type': 'application/json'
    }
    payload = {
        'bucketKey': bucket_name,
        'policyKey': 'persistent'
    }
    response = requests.post(url, headers=headers, data=json.dumps(payload))
    if response.status_code == 200 or response.status_code == 409:
        return True
    else:
        return False

# 上传文件到存储桶
def upload_file():
    url = f'https://developer.api.autodesk.com/oss/v2/buckets/{bucket_name}/objects/{object_name}'
    headers = {
        'Authorization': 'Bearer ' + get_access_token(),
        'Content-Type': 'application/octet-stream'
    }
    with open(object_name, 'rb') as file:
        response = requests.put(url, headers=headers, data=file)
    if response.status_code == 200 or response.status_code == 201:
        return True
    else:
        return False

# 发布职位并获取URN
def publish_job():
    url = 'https://developer.api.autodesk.com/modelderivative/v2/designdata/job'
    headers = {
        'Authorization': 'Bearer ' + get_access_token(),
        'Content-Type': 'application/json'
    }
    payload = {
        'input': {
            'urn': 'urn:adsk.objects:os.object:' + bucket_name + '/' + object_name
        },
        'output': {
            'formats': [
                {
                    'type': 'svf',
                    'views': ['2d', '3d']
                }
            ]
        }
    }
    response = requests.post(url, headers=headers, data=json.dumps(payload))
    if response.status_code == 200 or response.status_code == 201:
        urn = json.loads(response.text)['urn']
        return urn
    else:
        return None

# 执行操作
if create_bucket():
    print("存储桶创建成功")
    if upload_file():
        print("文件上传成功")
        urn = publish_job()
        if urn:
            print("发布职位成功，URN:", urn)
        else:
            print("发布职位失败")
    else:
        print("文件上传失败")
else:
    print("存储桶创建失败")

请注意替换代码中的YOUR_CLIENT_ID，YOUR_CLIENT_SECRET，YOUR_BUCKET_NAME和YOUR_FILE_NAME为您的实际值。

这个示例代码通过使用Forge API的身份验证、存储桶创建、文件上传和发布职位的功能，可以将文件存储在存储桶中并获取正确的URN。