S110 Test for a pass in the except block
Errors in Python code bases are typically communicated using
Exceptions. An exception object is 'raised' in the event of an error
and can be 'caught' at a later point in the program, typically some
error handling or logging action will then be performed.
However, it is possible to catch an exception and silently ignore it. This is illustrated with the following example
try: do_some_stuff() except Exception: pass
This pattern is considered bad practice in general, but also represents a potential security issue. A larger than normal volume of errors from a service can indicate an attempt is being made to disrupt or interfere with it. Thus errors should, at the very least, be logged.
There are rare situations where it is desirable to suppress errors, but
this is typically done with specific exception types, rather than the
base Exception class (or no type). To accommodate this, the test may be
configured to ignore 'try, except, pass' where the exception is typed.
For example, the following would not generate a warning if the
checked_typed_exception is set to False:
try: do_some_stuff() except ZeroDivisionError: pass
try_except_pass: check_typed_exception: True
>> Issue: Try, Except, Pass detected. Severity: Low Confidence: High Location: ./examples/try_except_pass.py:4 3 a = 1 4 except: 5 pass