进入 Python 可以 import, 写在文件里就导入失败

我用pip install cloudinary安装了 cloudinary 准备上传照片.

进入 python 可以正常导入这个库:
>>> import cloudinary
>>> import cloudinary.uploader
>>> from cloudinary.uploader import upload
>>> cloudinary.__file__
 '/home/xiao/anaconda2/lib/python2.7/cloudinary/__init__.pyc'
>>> cloudinary.uploader.__file__
 '/home/xiao/anaconda2/lib/python2.7/cloudinary/uploader.pyc'

但是import cloudinary.uploader写到文件里运行就会报错:
xiao@ubuntu:~/Earth$ python cloudinary.py
/home/xiao/Earth/cloudinary.pyc
Traceback (most recent call last):
  File "cloudinary.py", line 8, in <module>
   import cloudinary
  File "/home/xiao/Earth/cloudinary.py", line 10, in <module>
   import cloudinary.uploader
ImportError: No module named uploader

可有大神知道怎么回事?