Exception Handling

Try-Except Block#

try:
  doSmth()
except OSError as err:
  print("OS Error: {0}".format(err))
except ValueError:
  print("Could not convert data")
except:
  print("Unexpected error!")
  raise

Raising Exceptions#

if x > 0:
  raise RuntimeError("Input cannot be greater than zero.")
else:
  doSmth();

Creating Your Own Exceptions#

class ValueTooLargeError(Error):
   """Raised when the input value is too large"""
   pass

# Main Program
if x > 0:
  raise ValueTooLargeError

Reference: https://docs.python.org/3/tutorial/errors.html