
from __future__ import print_function
from __future__ import unicode_literals
from __future__ import division
import functools
from itertools import izip, tee


def memoized_property(fget):
    """Decorator to create memoized properties."""
    attr_name = '_{}'.format(fget.__name__)

    @functools.wraps(fget)
    def fget_memoized(self):
        if not hasattr(self, attr_name):
            setattr(self, attr_name, fget(self))
        return getattr(self, attr_name)
    return property(fget_memoized)


def pairwise(iterable):
    """Utility function to iterate in a pairwise fashion."""
    a, b = tee(iterable)
    next(b, None)
    return izip(a, b)


from __future__ import print_function
from __future__ import unicode_literals
from __future__ import division
import functools
from itertools import tee

try:
    from itertools import izip
except ImportError:
    izip = zip


def memoized_property(fget):
    """Decorator to create memoized properties."""
    attr_name = '_{}'.format(fget.__name__)

    @functools.wraps(fget)
    def fget_memoized(self):
        if not hasattr(self, attr_name):
            setattr(self, attr_name, fget(self))
        return getattr(self, attr_name)
    return property(fget_memoized)


def pairwise(iterable):
    """Utility function to iterate in a pairwise fashion."""
    a, b = tee(iterable)
    next(b, None)
    return izip(a, b)

Fix izip import for python3
Fix izip import for python3

  
  from __future__ import print_function
  from __future__ import unicode_literals
  from __future__ import division
  import functools
- from itertools import izip, tee
+ from itertools import tee
+ 
+ try:
+     from itertools import izip
+ except ImportError:
+     izip = zip
  
  
  def memoized_property(fget):
      """Decorator to create memoized properties."""
      attr_name = '_{}'.format(fget.__name__)
  
      @functools.wraps(fget)
      def fget_memoized(self):
          if not hasattr(self, attr_name):
              setattr(self, attr_name, fget(self))
          return getattr(self, attr_name)
      return property(fget_memoized)
  
  
  def pairwise(iterable):
      """Utility function to iterate in a pairwise fashion."""
      a, b = tee(iterable)
      next(b, None)
      return izip(a, b)
  
Fix izip import for python3
## Code Before:

from __future__ import print_function
from __future__ import unicode_literals
from __future__ import division
import functools
from itertools import izip, tee


def memoized_property(fget):
    """Decorator to create memoized properties."""
    attr_name = '_{}'.format(fget.__name__)

    @functools.wraps(fget)
    def fget_memoized(self):
        if not hasattr(self, attr_name):
            setattr(self, attr_name, fget(self))
        return getattr(self, attr_name)
    return property(fget_memoized)


def pairwise(iterable):
    """Utility function to iterate in a pairwise fashion."""
    a, b = tee(iterable)
    next(b, None)
    return izip(a, b)

## Instruction:
Fix izip import for python3
## Code After:

from __future__ import print_function
from __future__ import unicode_literals
from __future__ import division
import functools
from itertools import tee

try:
    from itertools import izip
except ImportError:
    izip = zip


def memoized_property(fget):
    """Decorator to create memoized properties."""
    attr_name = '_{}'.format(fget.__name__)

    @functools.wraps(fget)
    def fget_memoized(self):
        if not hasattr(self, attr_name):
            setattr(self, attr_name, fget(self))
        return getattr(self, attr_name)
    return property(fget_memoized)


def pairwise(iterable):
    """Utility function to iterate in a pairwise fashion."""
    a, b = tee(iterable)
    next(b, None)
    return izip(a, b)
