exception problem

[Charles Hixson]

The code:
print ("pre-chunkLine")
chunks = []
try:
chunks = self.chunkLine (l)
except:
print ("caught exception")
print (sys.exc_info()[:2])
finally:
print ("at finally")
print ("chunks =")
print (repr(chunks), ".", end = ":")
produces this result:
. . ., by
pre-chunkLine
caught exception
at finally
path 3...

Any suggestions as to what's wrong with the code?
FWIW, chunkLine begins:
def chunkLine (self, line):
print ("chunkLine: ")
print ("line = ", line)
if line == None:
return []
assert (isinstance (line, str) )