python之优化多个 sed 语句

我想优化我对具有这种结构的文件的处理:

2014-01-21 14:26:05.900,2014-01-21 14:26:05.740,    0.000,    192.168.40.2,   192.168.40.26,6    ,  8000, 33311,  172000,    2000,.A..S.,  0 
2014-01-21 14:29:23.900,2014-01-21 14:29:23.340,    0.000,   192.168.40.26,    192.168.40.2,6    , 33317,  8000, 3052000,    2000,.A....,  0 
2014-01-21 14:30:25.900,2014-01-21 14:30:25.330,    0.000,   192.168.40.26,    192.168.40.2,17   , 36193,   514,  558000,    2000,......,  0 
2014-01-21 14:31:04.901,2014-01-21 14:31:04.222,    0.000,  192.168.40.242,    192.168.40.2,17   , 57516,   514,  422000,    2000,......,  0 
2014-01-21 14:31:13.900,2014-01-21 14:31:13.143,    0.000,   192.168.40.16,    192.168.40.2,17   , 53313,   514,  540000,    2000,......,  0 

到具有这种结构的文件:

2014-01-21 14:26:05.900,900,0.000,192.168.40.2,192.168.40.26,6,8000,33311,172000,2000,.A..S.,0 
2014-01-21 14:29:23.900,900,0.000,192.168.40.26,192.168.40.2,6,33317,8000,3052000,2000,.A....,0 
2014-01-21 14:30:25.900,900,0.000,192.168.40.26,192.168.40.2,17,36193,514,558000,2000,......,0 
2014-01-21 14:31:04.901,901,0.000,192.168.40.242,192.168.40.2,17,57516,514,422000,2000,......,0 
2014-01-21 14:31:13.900,900,0.000,192.168.40.16,192.168.40.2,17,53313,514,540000,2000,......,0 

要优化的命令:

sed -e 's/,\s\+/,/g' -i /tmp/to_filter 
sed -e 's/\s\+,/,/g' -i /tmp/to_filter 
while IFS=, read -r f1 f2 f3 f4 f5 f6 f7 f8 f9 f10; do 
    echo "$f1,${f1##*.},$f3,$f4,$f5,$f6,$f7,$f8,$f9,$f10" 
done < /tmp/to_filter 

请您参考如下方法:

awk 'BEGIN{FS=OFS=","} {t=$2=$1; sub(/.*\./,"",$2); gsub(/ /,""); $1=t} 1' file       
2014-01-21 14:26:05.900,900,0.000,192.168.40.2,192.168.40.26,6,8000,33311,172000,2000,.A..S.,0 
2014-01-21 14:29:23.900,900,0.000,192.168.40.26,192.168.40.2,6,33317,8000,3052000,2000,.A....,0 
2014-01-21 14:30:25.900,900,0.000,192.168.40.26,192.168.40.2,17,36193,514,558000,2000,......,0 
2014-01-21 14:31:04.901,901,0.000,192.168.40.242,192.168.40.2,17,57516,514,422000,2000,......,0 
2014-01-21 14:31:13.900,900,0.000,192.168.40.16,192.168.40.2,17,53313,514,540000,2000,......,0