## Packages
import sys
import os
import glob
import json
import matplotlib.pyplot as plt
import watson_developer_cloud

## Cloud service credential connection
discovery_creds = helper.fetch_credentials('discovery')

discovery = watson_developer_cloud.DiscoveryV1(
                        version='2018-08-01',
                        url=discovery_creds['url'],
                        iam_apikey=discovery_creds['apikey'])

## Environment initialization
env, env_id = helper.fetch_object(
    discovery, "environment", "Compugin",
    create=True, create_args=dict(
        description="Compugin 1.0 -- Question/Answering"
    ))

# Lists existing configurations for the service instance and store default configuration id
configurations = discovery.list_configurations(environment_id=env_id).get_result()
cfg_id =  configurations['configurations'][0]['configuration_id']
print(json.dumps(configurations, indent=2))

# List default configuration details
config = discovery.get_configuration(environment_id=env_id, configuration_id=cfg_id).get_result()
print(json.dumps(config, indent=2))

# Test configuration on some sample text
data_dir = "data"
filename = os.path.join(data_dir, "sample.html")
with open(filename, "r") as f:
    res = discovery.test_configuration_in_environment(environment_id=env_id, configuration_id=cfg_id, file=f).get_result()
print(json.dumps(res, indent=2))

当尝试运行上面的python代码时，我收到这个错误：

Traceback（最近调用的最后一个）：文件compugin.py，第7行，在importwatson_developer_cloud重要错误：没有模块名为watson_developer_cloud

我已经使用pip安装了watson_developer_cloud包，不知道我做错了什么。