Python Question

BitsAndBytes

Hi Folks,

I am new to Python. I am looking for the best way to delete all lines from a file that contains characters.

For example, from below, only User1, User2, User3 and User 4 would exist after processing. Notice User 4 has a space.

5!pY
"TmL
c]+y?"
|)}?E
\e2g%
User1
User2
User3
User 4
11-01-05
[GO-B

If anyone could point me in the right direction I'd greatly appreciate it.

Thanks

jmcc

BitsAndBytes wrote: »

Hi Folks,

I am new to Python. I am looking for the best way to delete all lines from a file that contains characters.

Check out the re module (Regex). You can use it to detect the characters you want to delete and then delete the line or don't write it to the output file. Basically you can do this (this is pseudocode):

Open input file
Open output file

While there are lines in the input file:
Read a line from input file
Has it unwanted characters?
(this is the regex part)
if no:
write file to output file

Close input file
Close output file


http://docs.python.org/library/re.html
http://docs.python.org/howto/regex.html

There may be other ways but I think (with my limited knowledge of Python), the re module is the best way of doing it.

Basically you would construct a regex of the characters that you want to filter and if the input line has any of these characters, it is ignored and not written to the output file. A line without these characters will be written to the output file.

Regards...jmcc

BitsAndBytes

Hi,

thanks for the reply. I managed to get what I needed done.