Fix utf8 encoding error when opening resource_exceptions.json

[rstijerina]

Description

Instantiating an Agave object throws an exception in python 3.6, point of failure being the opening of the resource_exceptions.json file:

UnicodeDecodeError: 'ascii' codec can't decode byte 0xe2 in position 8993: ordinal not in range(128)

Exception Traceback:

$ ipython
Python 3.6.8 (default, Aug  7 2019, 17:28:10)
Type 'copyright', 'credits' or 'license' for more information
IPython 7.8.0 -- An enhanced Interactive Python. Type '?' for help.

In [1]: from agavepy.agave import Agave

In [2]: Agave()
---------------------------------------------------------------------------
UnicodeDecodeError                        Traceback (most recent call last)
<ipython-input-2-0cfaa5d4a0cc> in <module>
----> 1 Agave()

/usr/local/lib/python3.6/site-packages/agavepy/agave.py in __init__(self, **kwargs)
    269         if self.resources is None:
    270             self.resources = load_resource(self.api_server)
--> 271         self.resource_exceptions = json.load(open(os.path.join(HERE, 'resource_exceptions.json'), 'r'))
    272         self.host = urllib.parse.urlsplit(self.api_server).netloc
    273         if self.token_callback and not hasattr(self.token_callback, '__call__'):

/usr/lib64/python3.6/json/__init__.py in load(fp, cls, object_hook, parse_float, parse_int, parse_constant, object_pairs_hook, **kw)
    294
    295     """
--> 296     return loads(fp.read(),
    297         cls=cls, object_hook=object_hook,
    298         parse_float=parse_float, parse_int=parse_int,

/usr/lib64/python3.6/encodings/ascii.py in decode(self, input, final)
     24 class IncrementalDecoder(codecs.IncrementalDecoder):
     25     def decode(self, input, final=False):
---> 26         return codecs.ascii_decode(input, self.errors)[0]
     27
     28 class StreamWriter(Codec,codecs.StreamWriter):

UnicodeDecodeError: 'ascii' codec can't decode byte 0xe2 in position 8993: ordinal not in range(128)

This can be fixed by opening the file with an encoder='utf-8' specified.

Motivation and Context

Necessary in order to instantiate Agave objects via from agavepy.agave import Agave.

• I have raised an issue to propose this change (required)

How Has This Been Tested?

Tested with IPython 7.8.0 and Python 3.6.8 in a CentOS 7 docker container.

$ pip install git+https://github.com/rstijerina/agavepy
$ ipython
Python 3.6.8 (default, Aug  7 2019, 17:28:10)
Type 'copyright', 'credits' or 'license' for more information
IPython 7.8.0 -- An enhanced Interactive Python. Type '?' for help.
In [1]: from agavepy.agave import Agave

In [2]: Agave()
Out[2]: <agavepy.agave.Agave at 0x7faef42e51d0>

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have signed-off my commits with git commit -s
• I have added tests to cover my changes.
• All new and existing tests passed.