search a string

[Carl J. Van Arsdall]

Bruno Desthuilliers wrote:
> Carl J. Van Arsdall a écrit :
>   
>> david brochu jr wrote:
>>
>>     
>>> Hello,
>>>  
>>>  
>>> I have a text file with the following string:
>>> ['\r\n', 'Pinging www.ebayyy.com <http://www.ebayyy.com/> 
>>> [207.189.104.86 <http://207.189.104.86>] with 32 bytes of data:\r\n', 
>>> '\r\n', 'Request timed out.\r\n', '\r\n', 'Ping statistics for 
>>> 207.189.104.86:\r\n', '    Packets: Sent = 1, Received = 0, Lost = 1 
>>> (100% loss),\r\n']
>>>  
>>>  
>>> How would I search to find out if the string contained "Request" and 
>>> report if "Request" was found or not in the string?
>>>       
>
> <op>
> First point : this is not a string, but a list of strings. I suppose it 
> comes from a file.readlines() call. If you want the whole file content 
> as a single string, use file.read() instead - but take care of big files...
> </op>
>   

Ha, oops, that's what I get for not wearing my glasses.

>   
>> Well, there really are two ways you could go about it depending on what 
>> you are more comfortable with.
>>
>> One way:
>>
>> import re
>> line = '<...>' # all that stuff from above
>> regExp = re.compile('Request')
>> if regExp.match(line):
>>  print 'I found requested'
>>
>>     
>
> FWIW, you could also hand-code a dedicated parser - preferably in 
> assembler - then write a Python binding for it.
>
>   
>> or you can use one of the string modules, 
>>     
>
>   
So the code below confuses me:

> Or just use str object's methods...
>
> f = open('mylogfile.log')
> for line in f:
>    if "Request" in line:
>      print "got one"
>      break
> else:
>    print "no Request found in mylogfile.log"
>   
> f.close()
>   
With a file object, to iterate through the lines in a file don't you 
have to use readlines()?

Something more like

f = open ('mylogfile.log')
for line in f.readlines():
  if .....


?



-- 

Carl J. Van Arsdall
cvanarsdall at mvista.com
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