fix backend bug

[ben-jones]

fix bug in backend where we try to call a json dict. from execution on one of the Pis:

Traceback (most recent call last):
File "/home/pi/centinel/centinel.py", line 36, in
centinel.backend.sync(configuration.params)
File "/home/pi/centinel/centinel/backend.py", line 137, in sync
for experiment in (set(user.experiments) - available_experiments):
File "/home/pi/centinel/centinel/backend.py", line 37, in experiments
return self.request("experiments")["experiments"]
File "/home/pi/centinel/centinel/backend.py", line 29, in request
return req.json()
TypeError: 'dict' object is not callable

[gsathya]

req is a requests object. why is this a dict?

[gsathya]

also, do you have a testcase that reproduces this?

[ben-jones]

@gsathya, sorry, I apparently didn't successfully post my followup. On Rasperian, the distro we are running on the Pis, the package python-requests uses version 0.2 of the requests, but the current version is 2.4. I was able to resolve this issue by installing pip and pulling down the package over pip.