How to access metadata using NetCDF4 python package

import netCDF4 as ncfn = ‘/path/to/file.nc4’
ds = nc.Dataset(fn)

# import Dataset from netCDF4
from netCDF4 import Dataset

# open nc file and save to nc
ds = Dataset('myfile.nc')

# print all metadata
print(ds)

# print metadata in key and value
print(ds.__dict__)

# print a specific key value
print(ds.__dict__['creator']

# print dimensions
print(ds.dimensions) or 
for dim in ds.dimensions.values():
    print(dim)

# print variable names only
print(ds.variables.keys())

# print crs
crs = nc.variables['crs']