PYTHON

raise a custom exception python

raise Exception "FileError: 
Could not read file."

python custom exception

class UnderAge(Exception):
   pass
 
def verify_age(age):
   if int(age) < 18:
       raise UnderAge
   else:
       print('Age: '+str(age))
 
# main program
verify_age(23)  # won't raise exception
verify_age(17)  # will raise exception

create custom exception python

class CustomError(Exception):
  	pass

python raise exception with custom message

raise Exception("Error: Something went wrong")

python assert raise custom exception

This will work. But it's kind of crazy.

try:
    assert False, "A Message"
except AssertionError, e:
    raise Exception( e.args )
Why not the following? This is less crazy.

if not someAssertion: raise Exception( "Some Message" )
It's only a little wordier than the assert statement, but doesn't violate our expectation that assert failures raise AssertionError.

Consider this.

def myAssert( condition, action ):
    if not condition: raise action