demo_python_ref_keyword_raise_1.py:
​x
 
x = -1
​
if x < 0:
  raise Exception("Sorry, no numbers below zero")
​
python@w3school.org.cn:/home/python#python demo_python_ref_keyword_raise_1.py
Traceback (most recent call last):
  File "demo_python_ref_keyword_raise_1.py", line 4, in <module>
    raise Exception("Sorry, no numbers below zero")
Exception: Sorry, no numbers below zero