scene.resample(cache_dir=) fails with TypeError: Unicode-objects must be encoded before hashing

[howff]

Code Sample, a minimal, complete, and verifiable piece of code

local_scene = global_scene.resample(opt_mapping, nprocs=num_threads, resampler=opt_resampler, cache_dir="/var/tmp") 

Problem description

TypeError: Unicode-objects must be encoded before hashing

Actual Result, Traceback if applicable

    local_scene = global_scene.resample(opt_mapping, nprocs=num_threads, resampler=opt_resampler, cache_dir="/var/tmp") 
  File "lib/python3.4/site-packages/satpy/scene.py", line 596, in resample
    **resample_kwargs)
  File "lib/python3.4/site-packages/satpy/dataset.py", line 572, in resample
    new_data = resample(source_area, data, destination_area, **kwargs)
  File "lib/python3.4/site-packages/satpy/resample.py", line 521, in resample
    return resampler.resample(data, **kwargs)
  File "lib/python3.4/site-packages/satpy/resample.py", line 173, in resample
    cache_id = self.precompute(cache_dir=cache_dir, **kwargs)
  File "lib/python3.4/site-packages/satpy/resample.py", line 250, in precompute
    filename = self._create_cache_filename(cache_dir, kd_hash)
  File "lib/python3.4/site-packages/satpy/resample.py", line 186, in _create_cache_filename
    cache_dir, hashlib.sha1(hash_str).hexdigest() + ".npz")
TypeError: Unicode-objects must be encoded before hashing

Versions of Python, package at hand and relevant dependencies

python 3.4
satpy master

[mraspaud]

I think this is fixed now in master. Feel free to reopen if not.