[Tutor] Writing to text files

[Orri Ganel]

Byron wrote:

>Hi Johan,
>
>It's actually fairly simply and straight forward...  Here's how to do 
>it:  (I haven't officially tested this code for bugs, but I believe it 
>is correct.)
>
>file = open("datafile.txt", "r")
>filedata = file.read()
>file.close()
>
>newLine = "Your new line of data with the time stamp goes here.\n" + 
>filedata
>file = open("datafile.txt", "w")
>file.write(newLine)
>file.close()
>
>---
>
>Hope this helps,
>
>Byron  :-)
>---
>
>
>
>
>Johan Geldenhuys wrote:
>
>  
>
>>Hi all,
>>I want to write to a text file with a timestamp, but I want to newest 
>>entry at the top. So I want to insert the next entry to the file at 
>>the beginning.
>>I can create and append to a file and then the latest entry is at the 
>>bottom.
>>Any ideas how this is done please?
>>
>>Thanks,
>>
>>Johan
>>
>>------------------------------------------------------------------------
>>
>>_______________________________________________
>>Tutor maillist  -  Tutor at python.org
>>http://mail.python.org/mailman/listinfo/tutor
>> 
>>
>>    
>>
>
>
>_______________________________________________
>Tutor maillist  -  Tutor at python.org
>http://mail.python.org/mailman/listinfo/tutor
>
>  
>
No . . . when you open a file as "w" it erases whatever was there before:

 >>> f = open("ban.txt", "w")
 >>> f.write("ban")
 >>> f.close()
 >>> f = open("ban.txt", "r")
 >>> f.read()
'ban'
 >>> f.close()
 >>> f = open("ban.txt", "w")
 >>> f.close()
 >>> f = open("ban.txt", "r")
 >>> f.read()
''

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