old_contents: from hail.representation import *
  from hail.context import HailContext
  from hail.dataset import VariantDataset
  from hail.typ import *
  from hail.keytable import KeyTable
  from hail.kinshipMatrix import KinshipMatrix
  from hail.ldMatrix import LDMatrix
  from hail.utils import hadoop_read, hadoop_write, hadoop_copy
  
  __all__ = ['HailContext',
             'VariantDataset',
             'KeyTable',
             'Variant',
             'Locus',
             'AltAllele',
             'Interval',
             'Genotype',
             'Struct',
             'Call',
             'Pedigree',
             'Trio',
             'Type',
             'TInt32',
             'TInt64',
             'TFloat32',
             'TFloat64',
             'TString',
             'TBoolean',
             'TArray',
             'TSet',
             'TDict',
             'TStruct',
             'TLocus',
             'TVariant',
             'TAltAllele',
             'TGenotype',
             'TCall',
             'TInterval',
             'hadoop_read',
             'hadoop_write',
             'hadoop_copy',
             'KinshipMatrix',
             'LDMatrix',
             'typ',
             'representation'
             ]
  
new_contents: from hail.representation import *
  from hail.context import HailContext
  from hail.dataset import VariantDataset
  from hail.typ import *
  from hail.keytable import KeyTable
  from hail.kinshipMatrix import KinshipMatrix
  from hail.ldMatrix import LDMatrix
  from hail.utils import hadoop_read, hadoop_write, hadoop_copy
  
  import sys
  if sys.version_info >= (3, 0) or sys.version_info <= (2, 6):
      raise EnvironmentError('Hail requires Python 2.7, found {}.{}'.format(
          sys.version_info.major, sys.version_info.minor))
  
  __all__ = ['HailContext',
             'VariantDataset',
             'KeyTable',
             'Variant',
             'Locus',
             'AltAllele',
             'Interval',
             'Genotype',
             'Struct',
             'Call',
             'Pedigree',
             'Trio',
             'Type',
             'TInt32',
             'TInt64',
             'TFloat32',
             'TFloat64',
             'TString',
             'TBoolean',
             'TArray',
             'TSet',
             'TDict',
             'TStruct',
             'TLocus',
             'TVariant',
             'TAltAllele',
             'TGenotype',
             'TCall',
             'TInterval',
             'hadoop_read',
             'hadoop_write',
             'hadoop_copy',
             'KinshipMatrix',
             'LDMatrix',
             'typ',
             'representation'
             ]
  
subject: Check for Python version at import time. (#2351)