如何用Python pip安装google.cloud？

我对Python比较陌生,而且我坚持一些可能相对容易解决的问题.

我安装了以下软件包:

pip install --upgrade google-api-python-client
pip install --upgrade google-cloud
pip install --upgrade google-cloud-vision

在我的Python文件中,我有:

import cv2
import io
import os

# Imports the Google Cloud client library
from google.cloud import vision

...etc...

这给了我错误:

Traceback (most recent call last):
  File "test.py", line 6, in 
    from google.cloud import vision
ImportError: No module named 'google.cloud'

我错过了什么,我应该在哪里(日志？)找到答案.

PS:
Pip安装google-cloud并google-cloud-vision输出:

Cannot remove entries from nonexistent file /Users/foobar/anaconda/lib/python3.5/site-packages/easy-install.pth

更新:
运行pip freeze不显示要安装的包...