[python-win32] error in list length

[Larry Bates]

kNish wrote:
> Hi,
> 
>               The following lines of code gives an error starting with 
> line where len() is used
> 
> 
>                 local_BkFiles = glob.glob(localDirectoryName+'\\*' + 
> data + '*bk*')
> local_BkFiles.sort(key=str.upper)
> last_pv_File_Name = local_PvFiles[len(local_PvFiles)-1]
> split_last_pv_File_Name = 
> re.search(data+"_bk[0-9]{2}_[a-z]{3}_pv[0-9]{2}",last_pv_File_Name )
> lastPv_FileVersion = 
> re.search('(?<=pv)\d+',split_last_pv_File_Name.group(0))
> 
> 
> This code is being called in a procedure or function def. How may I 
> solve this.
> 
> 
> BRgds,
> 
> 
> kNish
> 
> 
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Since you didn't post your full traceback (you should always do that in the 
future), we are guessing:

local_PvFiles isn't defined prior to trying to determine its length.

The way to get the last element of a list is:

local_PvFiles[-1]

you don't need to do all the length gymnastics.

I'm no regex expert, so I'll leave that part to someone else but if the 
filenames are a fixed format, you don't need regex at all to extract the 
version.  If it is a completely variable format, then you would.

-Larry