import sys
if len(sys.argv)!=3:
    print u'Usage: mygrep filename findword'
    sys.exit(1)
tmp,filename,findword=sys.argv
j=0
try:
    for x in open(filename,'r'):
        if x.find(findword)!=-1:
            j+=1
            print j,x
except Exception,e:
    print e

象上面代码中 for x in open(filename,'r')
这样的写法，在程序运行结束后会自动关闭文件吗？或者是不是应该避免这样写程序？

--

开飞机的舒克
http://www.lvye.org/shuke
msn:weizhong at netease.com
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会

在 06-1-6，魏忠<weizhong2004 at gmail.com> 写道：
> import sys
> if len(sys.argv)!=3:
>     print u'Usage: mygrep filename findword'
>     sys.exit(1)
> tmp,filename,findword=sys.argv
> j=0
> try:
>     for x in open(filename,'r'):
>         if x.find(findword)!=-1:
>             j+=1
>             print j,x
> except Exception,e:
>     print e
>
> 象上面代码中　for x in open(filename,'r')
> 这样的写法，在程序运行结束后会自动关闭文件吗？或者是不是应该避免这样写程序？
>
> --
>
> 开飞机的舒克
>  http://www.lvye.org/shuke
> msn:weizhong at netease.com
> _______________________________________________
> python-chinese
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>

try:
   pass  # file or network work
finally:
   clean-up   # always do clean, but don't nest an exception here!
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