throw error in python

1raise Exception("Error")

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",)

1import traceback
2
3dict = {'a':3,'b':5,'c':8}
4try:
5  print(dict[q])
6 
7except:
8  traceback.print_exc()
9  
10# This will trace you back to the line where everything went wrong. 
11# So in this case you will get back line 5    
12  
13  

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#Best practive: raise statement	
2raise ValueError('A very specific bad thing happened')