Moved file io into a dedicated io module.

plio/__init__.py

 __version__ = "0.1.0"
 
 # Submodule imports
-from . import isis_serial_number
-from . import io_controlnetwork
-from . import io_gdal
-from . import io_json
-from . import io_krc
-from . import io_yaml
-from . import io_db
-from . import io_hdf
-from . import utils
-from . import examples
+from plio.io import io_db
 from . import data
+from . import examples
+from . import utils
+

plio/io_controlnetwork.py → plio/io/io_controlnetwork.py

 from time import gmtime, strftime
+
 import pvl
 
-from plio import ControlNetFileV0002_pb2 as cnf
+from plio.io import ControlNetFileV0002_pb2 as cnf
 from plio.utils.utils import xstr
 
 try:

plio/io_db.py → plio/io/io_db.py

 from sqlalchemy import Column, Integer, String, create_engine, orm
 from sqlalchemy.ext import declarative
 
-from .sqlalchemy_json.alchemy import NestedJsonObject
+from plio.sqlalchemy_json.alchemy import NestedJsonObject
 
 Base = declarative.declarative_base()
 

plio/io_gdal.py → plio/io/io_gdal.py

-import warnings
-
-import pvl
 import os
+import warnings
 
-from plio.utils.utils import find_in_dict
-from osgeo import ogr
-import numpy as np
 import gdal
 import gdalconst
+import numpy as np
 import osr
+import pvl
+from osgeo import ogr
 
-from plio import extract_metadata
+from plio.io import extract_metadata
+from plio.utils.utils import find_in_dict
 
 gdal.UseExceptions()
 

plio/isis_serial_number.py → plio/io/isis_serial_number.py

 import warnings
-import plio
-from plio.data import get_data
-from plio.io_db import Translations, StringToMission, setup_db_session
-from plio.utils.utils import find_in_dict, find_nested_in_dict
 
 import pvl
 from pvl._collections import PVLModule
 
+import plio
+from plio.data import get_data
+from plio.io.io_db import Translations, StringToMission, setup_db_session
+from plio.utils.utils import find_in_dict, find_nested_in_dict
+
 
 def get_isis_translation(label):
     """

plio/tests/test_io_controlnetwork.py → plio/io/tests/test_io_controlnetwork.py

 import os
 import sys
-from time import strftime, gmtime
 import unittest
+from time import strftime, gmtime
+
 import pandas as pd
 import pvl
 
 from .. import io_controlnetwork
 from .. import ControlNetFileV0002_pb2 as cnf
-
 from plio.utils.utils import find_in_dict
 
 sys.path.insert(0, os.path.abspath('..'))

plio/tests/test_io_db.py → plio/io/tests/test_io_db.py

 import os
+import sys
 import unittest
 
 from sqlalchemy.orm import session
 
 from plio.data import get_data
 
-import sys
 sys.path.insert(0, os.path.abspath('..'))
 
-from .. import io_db
+from plio.io import io_db
 
 
 class TestDataDB(unittest.TestCase):

plio/tests/test_io_gdal.py → plio/io/tests/test_io_gdal.py

 import os
+import sys
 import unittest
+
 import numpy as np
 
 from plio.examples import get_path
 
-import sys
 sys.path.insert(0, os.path.abspath('..'))
 
-from .. import io_gdal
+from plio.io import io_gdal
 
 
 class TestMercator(unittest.TestCase):

plio/tests/test_io_hdf.py → plio/io/tests/test_io_hdf.py

@@ -4,7 +4,7 @@ import unittest
 import numpy as np
 import pandas as pd
 
-from .. import io_hdf
+from plio.io import io_hdf
 
 
 class TestHDF(unittest.TestCase):

plio/tests/test_isis_serial_numbers.py → plio/io/tests/test_isis_serial_numbers.py

 import os
+import sys
 import unittest
 
 from plio.examples import get_path
 
-import sys
 sys.path.insert(0, os.path.abspath('..'))
 
-from .. import isis_serial_number
+from plio.io import isis_serial_number
 
 
 class TestIsisSerials(unittest.TestCase):

plio/tests/test_metadata.py → plio/io/tests/test_metadata.py

 import unittest
+
 from osgeo import osr
+
 osr.UseExceptions()
 
-from .. import extract_metadata as em
+from plio.io import extract_metadata as em
+
 
 class TestSRSProjectionExtraction(unittest.TestCase):
 

plio/tests/test_structured_io.py → plio/io/tests/test_structured_io.py

 import unittest
 
-from .. import io_yaml
 from .. import io_json
+from .. import io_yaml
 
 try:
     import yaml