$ python
Python 2.7.10 (default, Oct  1 2015, 12:52:17)
[GCC 4.2.1 Compatible Apple LLVM 7.0.0 (clang-700.0.72)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import yt
>>> ds = yt.load('~/src/SimulationIO/example.h5')
yt : [INFO     ] 2015-11-01 10:10:35,975 Parameters: current_time              = 0.0
yt : [INFO     ] 2015-11-01 10:10:35,975 Parameters: domain_dimensions         = 3
yt : [INFO     ] 2015-11-01 10:10:35,975 Parameters: domain_left_edge          = [ 0.  0.  0.]
yt : [INFO     ] 2015-11-01 10:10:35,976 Parameters: domain_right_edge         = [ 1.  1.  1.]
yt : [INFO     ] 2015-11-01 10:10:35,976 Parameters: cosmological_simulation   = 0
>>> ds.print_stats()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Users/eschnett/src/yt/yt/utilities/parallel_tools/parallel_analysis_interface.py", line 319, in root_only
    return func(*args, **kwargs)
  File "/Users/eschnett/src/yt/yt/data_objects/static_output.py", line 361, in print_stats
    self.index.print_stats()
  File "/Users/eschnett/src/yt/yt/data_objects/static_output.py", line 328, in index
    self.create_field_info()
  File "/Users/eschnett/src/yt/yt/data_objects/static_output.py", line 371, in create_field_info
    self.field_info = self._field_info_class(self, self.field_list)
TypeError: __init__() takes exactly 2 arguments (3 given)
>>>