import netCDF4 as nc

ncfile = nc.Dataset("/pathway/file.nc", "r")

ncfile.dimensions.keys()
[u'time', u'lat', u'lon', u'bnds']

ncfile.variables.keys()
[u'time', u'time_bnds', u'lat', u'lat_bnds', u'lon', u'lon_bnds', u'snc']

for attr in ncfile.ncattrs():
    print attr, '=', getattr(ncfile, attr)

institution = CCCma (Canadian Centre for Climate Modelling and Analysis, Victoria, BC, Canada)
institute_id = CCCma
experiment_id = rcp85
source = CanESM2 2010 atmosphere: CanAM4 (AGCM15i, T63L35) ocean: CanOM4 (OGCM4.0, 256x192L40) and CMOC1.2 sea ice: CanSIM1 (Cavitating Fluid, T63 Gaussian Grid) land: CLASS2.7 and CTEM1
model_id = CanESM2
forcing = GHG,Oz,SA,BC,OC,LU,Sl (GHG includes CO2,CH4,N2O,CFC11,effective CFC12. Sl is the repeat of the 23rd solar cycle, years 1997-2008, after year 2008.)
parent_experiment_id = historical
parent_experiment_rip = r1i1p1
branch_time = 56940.0
contact = cccma_info@ec.gc.ca
references = http://www.cccma.ec.gc.ca/models
initialization_method = 1
physics_version = 1
tracking_id = ebf1ab27-15be-45df-a8f3-dbac739f9191
branch_time_YMDH = 2006:01:01:00
CCCma_runid = IDR
CCCma_parent_runid = IGM
CCCma_data_licence = 1) GRANT OF LICENCE - The Government of Canada (Environment Canada) is the
owner of all intellectual property rights (including copyright) that may exist in this Data
product. You (as "The Licensee") are hereby granted a non-exclusive, non-assignable,
non-transferable unrestricted licence to use this data product for any purpose including
the right to share these data with others and to make value-added and derivative
products from it. This licence is not a sale of any or all of the owner's rights.
2) NO WARRANTY - This Data product is provided "as-is"; it has not been designed or
prepared to meet the Licensee's particular requirements. Environment Canada makes no
warranty, either express or implied, including but not limited to, warranties of
merchantability and fitness for a particular purpose. In no event will Environment Canada
be liable for any indirect, special, consequential or other damages attributed to the
Licensee's use of the Data product.
product = output
experiment = RCP8.5
frequency = mon
creation_date = 2011-03-17T20:06:09Z
history = 2011-03-17T20:06:09Z CMOR rewrote data to comply with CF standards and CMIP5 requirements.
Conventions = CF-1.4
project_id = CMIP5
table_id = Table LImon (31 January 2011) 6f05b7e5f64aaa34bcac127ca47ac655
title = CanESM2 model output prepared for CMIP5 RCP8.5
parent_experiment = historical
modeling_realm = landIce land
realization = 1
cmor_version = 2.5.4

snc= ncfile.variables["snc"][:][0]

array([[-90.        , -86.48016542],
       [-86.48016542, -83.70472247],
       [-83.70472247, -80.91926226],
       [-80.91926226, -78.13125563],
       [-78.13125563, -75.34220992],
       [-75.34220992, -72.55263609],
       [-72.55263609, -69.76275656],
       [-69.76275656, -66.97268406],

xmin, ymin, xmax, ymax = [lon.min(), lat.min(), lon.max(), lat.max()]

(0.0, -87.863801343710804, 357.1875, 87.863801343710804)