raise python

1raise Exception("message")

1>>> def catch():
2...     try:
3...         asd()
4...     except Exception as e:
5...         print e.message, e.args
6... 
7>>> catch()
8global name 'asd' is not defined ("global name 'asd' is not defined",)

1try:
2  print("I will try to print this line of code")
3except ERROR_NAME:
4  print("I will print this line of code if error ERROR_NAME is encountered")

1>>> try:
2...     raise Exception('spam', 'eggs')
3... except Exception as inst:
4...     print(type(inst))    # the exception instance
5...     print(inst.args)     # arguments stored in .args
6...     print(inst)          # __str__ allows args to be printed directly,
7...                          # but may be overridden in exception subclasses
8...     x, y = inst.args     # unpack args
9...     print('x =', x)
10...     print('y =', y)
11...
12<class 'Exception'>
13('spam', 'eggs')
14('spam', 'eggs')
15x = spam
16y = eggs
17

1>>> def divide(x, y):
2...     try:
3...         result = x / y
4...     except ZeroDivisionError:
5...         print("division by zero!")
6...     else:
7...         print("result is", result)
8...     finally:
9...         print("executing finally clause")
10...
11>>> divide(2, 1)
12result is 2.0
13executing finally clause
14>>> divide(2, 0)
15division by zero!
16executing finally clause
17>>> divide("2", "1")
18executing finally clause
19Traceback (most recent call last):
20  File "<stdin>", line 1, in <module>
21  File "<stdin>", line 3, in divide
22TypeError: unsupported operand type(s) for /: 'str' and 'str'
23

1#Raises an error made by the user
2if something:
3    raise Exception('My error!')