title: Python 2.7 import dropbox SDK error
body: <p>After installing the "dropbox SDK" on my RaspberryPi</p>
  
  <pre><code>pi@raspberrypi:~ $ sudo pip install dropbox
  Downloading/unpacking dropbox
  Downloading dropbox-7.3.1-py2-none-any.whl (416kB): 416kB downloaded
  Downloading/unpacking requests&gt;=2.5.1,!=2.6.1 (from dropbox)
  Downloading requests-2.18.1-py2.py3-none-any.whl (88kB): 88kB downloaded
  Requirement already satisfied (use --upgrade to upgrade): urllib3 in 
  /usr/lib/python2.7/dist-packages (from dropbox)
  Requirement already satisfied (use --upgrade to upgrade): six&gt;=1.3.0 in 
  /usr/lib/python2.7/dist-packages (from dropbox)
  Downloading/unpacking certifi&gt;=2017.4.17 (from requests&gt;=2.5.1,!=2.6.1-
  &gt;dropbox)
  Downloading certifi-2017.4.17-py2.py3-none-any.whl (375kB): 375kB downloaded
  Downloading/unpacking chardet&gt;=3.0.2,&lt;3.1.0 (from requests&gt;=2.5.1,!=2.6.1-
  &gt;dropbox)
  Downloading chardet-3.0.4-py2.py3-none-any.whl (133kB): 133kB downloaded
  Downloading/unpacking idna&gt;=2.5,&lt;2.6 (from requests&gt;=2.5.1,!=2.6.1-&gt;dropbox)
  Downloading idna-2.5-py2.py3-none-any.whl (55kB): 55kB downloaded
  Installing collected packages: dropbox, requests, certifi, chardet, idna
  Found existing installation: requests 2.4.3
  Not uninstalling requests at /usr/lib/python2.7/dist-packages, owned by OS
  Found existing installation: chardet 2.3.0
  Not uninstalling chardet at /usr/lib/python2.7/dist-packages, owned by OS
  Successfully installed dropbox requests certifi chardet idna
  Cleaning up...
  </code></pre>
  
  <p>I get this error when my data_logger.py try to "import dropbox"</p>
  
  <pre><code>pi@raspberrypi:~/cb_logging/bin $ sudo ./data_logger.py
  /usr/local/lib/python2.7/dist-packages/requests/__init__.py:80: RequestsDependencyWarning: urllib3 (1.9.1) or chardet (3.0.4) doesn't match a supported version!
    RequestsDependencyWarning)
  Traceback (most recent call last):
    File "./data_logger.py", line 17, in &lt;module&gt;
      import dropbox
    File "/usr/local/lib/python2.7/dist-packages/dropbox/__init__.py", line 3, in &lt;module&gt;
      from .dropbox import __version__, Dropbox, DropboxTeam, create_session  # noqa: F401
    File "/usr/local/lib/python2.7/dist-packages/dropbox/dropbox.py", line 18, in &lt;module&gt;
      import requests
    File "/usr/local/lib/python2.7/dist-packages/requests/__init__.py", line 90, in &lt;module&gt;
      from urllib3.exceptions import DependencyWarning
  ImportError: cannot import name DependencyWarning
  pi@raspberrypi:~/cb_logging/bin $
  </code></pre>
  
  <p>I have not a clue whats wrong. Can sombody help?</p>