Python try except not working when adding for loop after

Not sure what the issue is with this, as I am using the same code in several places but is only breaking in one place. Connecting to sql db to append values to a list. Python 3.x

powder = []
try:
    cnxn = p.connect('DRIVER={/opt/microsoft/msodbcsql17/lib64/libmsodbcsql-17.5.so.2.1};SERVER='+server+';DATABASE='+db+';UID='+un+';PWD='+pw)
    cursor = cnxn.cursor()
    cursor.execute("SELECT * FROM Table WHERE Something='THING'")
    powd = cursor.fetchall()
except:
    powd = [['DUCKS']]

for p in powd:
     powder.append(p[0])

If the for loop is left off, it runs perfectly, the try succeeds and powd has all my needed values. When I add the for loop the try fails every time (first line doesn't even run).
I tried moving the for loop into the try and also tried adding a finally after except.
I am running this same code for different SQL Statements (most of which are more complex/larger datasets) and this code works perfect. Not sure what could be causing it to fail in this or how to get around it. Any thoughts/suggestions are appreciated.

Figured it out

import pyodbc as p

for loop was using p as the variable, once I changed that to pn it worked like a charm. Was trying to use a variable I already had set. Opps.

for pn in powd:
     powder.append(pn[0])