Python SDK constant errors

Same problem still meet after upgrading requests to 2.18.1

>>> import dropbox
>>> dbx = dropbox.Dropbox(' my token')
>>> dbx.users_get_current_account()

Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/home/scps950707/.local/lib/python2.7/site-packages/dropbox/base.py", line 3277, in users_get_current_account
None,
File "/home/scps950707/.local/lib/python2.7/site-packages/dropbox/dropbox.py", line 239, in request
timeout=timeout)
File "/home/scps950707/.local/lib/python2.7/site-packages/dropbox/dropbox.py", line 330, in request_json_string_with_retry
timeout=timeout)
File "/home/scps950707/.local/lib/python2.7/site-packages/dropbox/dropbox.py", line 414, in request_json_string
timeout=timeout,
File "/home/scps950707/.local/lib/python2.7/site-packages/requests/sessions.py", line 549, in post
return self.request('POST', url, data=data, json=json, **kwargs)
File "/home/scps950707/.local/lib/python2.7/site-packages/requests/sessions.py", line 502, in request
resp = self.send(prep, **send_kwargs)
File "/home/scps950707/.local/lib/python2.7/site-packages/requests/sessions.py", line 612, in send
r = adapter.send(request, **kwargs)
File "/home/scps950707/.local/lib/python2.7/site-packages/requests/adapters.py", line 440, in send
timeout=timeout
File "/home/scps950707/.local/lib/python2.7/site-packages/requests/packages/urllib3/connectionpool.py", line 587, in urlopen
timeout_obj = self._get_timeout(timeout)
File "/home/scps950707/.local/lib/python2.7/site-packages/requests/packages/urllib3/connectionpool.py", line 302, in _get_timeout
return Timeout.from_float(timeout)
File "/home/scps950707/.local/lib/python2.7/site-packages/requests/packages/urllib3/util/timeout.py", line 154, in from_float
return Timeout(read=timeout, connect=timeout)
File "/home/scps950707/.local/lib/python2.7/site-packages/requests/packages/urllib3/util/timeout.py", line 94, in __init__
self._connect = self._validate_timeout(connect, 'connect')
File "/home/scps950707/.local/lib/python2.7/site-packages/requests/packages/urllib3/util/timeout.py", line 127, in _validate_timeout
"int, float or None." % (name, value))
ValueError: Timeout value connect was Timeout(connect=30, read=30, total=None), but it must be an int, float or None.

adium-theme-ubuntu==0.3.4
backports.shutil-get-terminal-size==1.0.0
backports.shutil-which==3.5.1
beautifulsoup4==4.4.1
ccsm==0.9.12.2
certifi==2017.4.17
chardet==3.0.4
colorama==0.3.7
compizconfig-python==0.9.12.2
configparser==3.5.0
decorator==4.0.11
defer==1.0.6
Django==1.10.5
django-dbbackup==3.1.3
django-storages==1.6
dropbox==7.3.1
enum34==1.1.6
flake8==3.3.0
futures==3.0.5
html5lib==0.999
idna==2.5
iso-639==0.4.5
iso3166==0.8
lxml==3.5.0
mccabe==0.6.1
mysqlclient==1.3.10
pathlib2==2.2.1
psutil==5.1.3
pycodestyle==2.3.1
pycryptodome==3.4.5
pyflakes==1.5.0
Pygments==2.1
pygobject==3.20.0
python-apt==1.1.0b1
python-debian==0.1.27
pytz==2017.2
requests==2.18.1
scandir==1.4
singledispatch==3.4.0.3
six==1.10.0
streamlink==0.3.2
the**bleep**==3.14
typing==3.6.1
ubuntu-cleaner==1.0.4
unity-lens-photos==1.0
urllib3==1.21.1