old_contents: import sys
  
  import numpy
  import six
  
  import chainer
  from chainer.backends import cuda
  
  
  class _RuntimeInfo(object):
  
      chainer_version = None
      numpy_version = None
      cuda_info = None
  
      def __init__(self):
          self.chainer_version = chainer.__version__
          self.numpy_version = numpy.__version__
          if cuda.available:
              self.cuda_info = cuda.cupyx.get_runtime_info()
          else:
              self.cuda_info = None
  
      def __str__(self):
          s = six.StringIO()
          s.write('''Chainer: {}\n'''.format(self.chainer_version))
          s.write('''NumPy: {}\n'''.format(self.numpy_version))
          if self.cuda_info is None:
              s.write('''CuPy: Not Available\n''')
          else:
              s.write('''CuPy:\n''')
              for line in str(self.cuda_info).splitlines():
                  s.write('''  {}\n'''.format(line))
          return s.getvalue()
  
  
  def get_runtime_info():
      return _RuntimeInfo()
  
  
  def print_runtime_info(out=None):
      if out is None:
          out = sys.stdout
      out.write(str(get_runtime_info()))
  
new_contents: import sys
  
  import numpy
  import six
  
  import chainer
  from chainer.backends import cuda
  
  
  class _RuntimeInfo(object):
  
      chainer_version = None
      numpy_version = None
      cuda_info = None
  
      def __init__(self):
          self.chainer_version = chainer.__version__
          self.numpy_version = numpy.__version__
          if cuda.available:
              self.cuda_info = cuda.cupyx.get_runtime_info()
          else:
              self.cuda_info = None
  
      def __str__(self):
          s = six.StringIO()
          s.write('''Chainer: {}\n'''.format(self.chainer_version))
          s.write('''NumPy: {}\n'''.format(self.numpy_version))
          if self.cuda_info is None:
              s.write('''CuPy: Not Available\n''')
          else:
              s.write('''CuPy:\n''')
              for line in str(self.cuda_info).splitlines():
                  s.write('''  {}\n'''.format(line))
          return s.getvalue()
  
  
  def get_runtime_info():
      return _RuntimeInfo()
  
  
  def print_runtime_info(out=None):
      if out is None:
          out = sys.stdout
      out.write(str(get_runtime_info()))
      out.flush()
  
subject: fix to flush stdout