The glob module should work for this as well.
# Import modules
import glob,os
import arcpy
# Set geoprocessing workspace and working directory
path = r'C:\example'
print "Setting workspace to: " + path
arcpy.env.workspace = path
os.chdir(path)
listFiles = glob.glob('*.dbf')
print listFiles
# Loop through the list of text files
for currentFile in listFiles:
# Find the current file name and path
filename = currentFile[:-4]
FilePath = path + '/' + currentFile
# then run your conversion stuff on the current filename