Exceptions - General Questions

What is the output of the following code?

def check(x):
    assert x > 0, 'must be positive'
try:
    check(-1)
except AssertionError as e:
    print(e)

Which keyword raises an exception?

What is the output of the following code?

class MyError(Exception):
    pass
try:
    raise MyError('custom')
except MyError as e:
    print('caught', e)