Function which will accept stdin or arguments

-
function launch_python {
  exec 3>&-
  exec 4<&-
  pyin=$(mktemp -u)
  pyot=$(mktemp -u)
  mkfifo $pyin
  mkfifo $pyot
  python -u -i <$pyin &>$pyot &
  pypid=$!
  exec 3> $pyin
  exec 4< $pyot
  rm $pyin
  rm $pyot
  echo print >&3
  while read -u 4 line && [ "${line}" != '>>>' ]
  do
    echo  "# ${line}"
  done
  echo 'import sys;sys.ps2=""' >&3
}

function py_read {
  local line
  while read -u 4 line && [ "${line}" != 'bithon-eos' ]
  do
    while [ "${line#>>> }" != "${line}" ]
    do
        line=${line#>>> }
    done
    [ ${line} == '>>>' ] && continue
    echo "${line}"
  done
}

function _ppy {
  local line
  IFS=''
  while read line
  do
    echo "$line" >&3
  done
  echo >&3
  echo 'print "\nbithon-eos"' >&3
}

# Trick is make "$@" work as lhs of comparison is to prefix _
function py {
  if [ "_$@" == '_' ]
  then
      ( _ppy <&0 & )
  else
      ( (echo "$@" >&3; echo 'print "\nbithon-eos"' >&3)& )
  fi
  py_read
}

function kill_python {
  exec 4<&-
  exec 3>&-
  kill -9 $pypid
}

 ...

 for x in $(ppy << EOF
for x in xrange(10):
    print x*x / 0.123
EOF
); do echo $x; done
0.0
8.13008130081
32.5203252033
73.1707317073
130.081300813
203.25203252
292.682926829
398.37398374
520.325203252
658.536585366

 ...

 py "import numpy;numpy.median([$counts])"
46.0

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