A brief introduction to exception handling in Python

The python exception handling mechanism is similar to java in that it adopts the structure of try-except-finally.

try-except detects exceptions

format

try:

    try_statement

except (ErrorType1, ErrorType2),e:

    handle_statement

finally:

    finally_statement

The instance

#!/usr/bin/python

try:

    a=12

    b=0

    c = a/b

except Exception, e:

    print  "Exception occurs: " , e

finally:

    print "finally handle!" 

Context manager (with... as... Statement)

The with statement is particularly useful in scenarios where the resource is opened first and then released, because it automatically releases the occupied resource without the need to explicitly release the resource

format

with context_expr [as var]:

    with_statement

raise throws an exception

format

raise Exception[, args] or raise Exception(args)

The instance

raise Exception( ' exampleException')

assertions

Detect key points in the program, triggering AssertError(assertion error) if the assertion is unsuccessful
Format is as follows

assert expression[, arguements]