How to re-write this bash script in Python?

[sutanu.das at gmail.com]

#!/bin/bash

_maillist='pager at email.com'
_hname=`hostname`
_logdir=/hadoop/logs
_dirlog=${_logdir}/directory_check.log

_year=$(date -d "-5 hour" +%Y)
_month=$(date -d "-5 hour" +%m)
_day=$(date -d "-5 hour" +%d)
_hour=$(date -d "-5 hour" +%H)

_hdfsdir=`hdfs dfs -ls -d /hadoop/flume_ingest_*/$_year/$_month | awk '{print $8}'`

echo "Checking for HDFS directories:" > ${_dirlog}
echo >> ${_dirlog}

for _currdir in $_hdfsdir
do
hdfs dfs -ls -d $_currdir/$_day/$_hour &>> ${_dirlog}
done

if [[ `grep -i "No such file or directory" ${_dirlog}` ]];
then
echo "Verify Flume is working for all  servers" | mailx -s "HDFS Hadoop Failure on Flume: ${_hname}" -a ${_dirlog} ${_maillist}
fi