An exception is when the syntax is correct , An error when the program runs is an exception .

Catalog

Capture exception

Catch multiple exceptions

Custom exception

Capture exception

try...except...

try:
print("....")
except IOError:
pass

try In the middle is the code that may cause exceptions . When an error occurs , Jump to except Run seven methods to handle exceptions .

Catch multiple exceptions

If you want to pass once except Multiple exceptions can be caught in the form of a tuple

try:
print("...") # Code
except (IOError,NameError):
pass

Or handle different exceptions differently

try:
ptint("....")
except NameError:
print("nameerror")
except IOError:
print("IOError")

notes ： The exception of the parent class should be placed after its child class , Otherwise, there will never be subclass exception handling

in addition , You can also use try...except...else sentence , When try When there is no exception in the statement in ,else The code in will be executed . You can also else Followed by finally,finally The statement in , No matter try It will be executed whether there is any exception in .

Custom exception

Custom exception Class inheritance since Exception class , Can inherit directly , Or indirectly .