Python not catching exception -

for reason code not catching exception when throw it. have

def trim_rad(rad):     ...      if not modrad.shape[0]:         raise indexerror("couldn't find main chunk")     return modrad, thetas 

then later call function:

try:     modrad, thetas = trim_rad(rad) except indexerror("couldn't find main chunk"):     return 0 

yet still traceback exception. doing wrong?

you gave except instance of indexerror. instead:

try:     modrad, thetas = trim_rad(rad) except indexerror:     print "couldn't find main chunk"     return 0 

here example:

>>> try: ...     [1][1] ... except indexerror('no'): ...     pass ... traceback (most recent call last):   file "<stdin>", line 2, in <module> indexerror: list index out of range >>> try: ...     [1][1] ... except indexerror: ...     pass ... >>>