try:
	clause
except ExceptI as errorInfo:
	if ExceptI is raised, execute this block
except ExceptII as errorInfo:
	if ExceptII is raised, execute this block
except:
	handle any other exception
else:
	if no exception, execute this block
finally:
	this would always be executed
		

#!/usr/bin/python

try:
   fh = open("testfile", "r")
   fh.write("This is my test file for exception handling!!")
except IOError as argument:
   print ("Error: can\'t find file or read data", argument)
else:
   print ("Written content in the file successfully")
   fh.close()
finally:
    print("End of try ... except ...")
		

#!/usr/bin/python

try:
   fh = open("testfile", "r")
   raise ValueError('Value Error')
except IOError as argument:
    print ("Error: can\'t find file or read data\n", argument)
except Exception as err: # handle any exceptions
    print(err)
#except: # handle any exceptions
    #print ("Error: value error\n")
else:
    print ("Written content in the file successfully")
    fh.close()
finally:
    print("End of try ... except ...")
		

raise Exception(errorInfo)
		

• Exception Hierarchy

#!/usr/bin/python
 
def div(a, b):
    if b == 0:
        raise ZeroDivisionError("Denominator is zero ...");
    return a/b;
 
if __name__ == '__main__':
    try:
        div(1, 0);
    except Exception as err:
        print(err.args, err);
		

#!/usr/bin/python
 
def div(a, b):
    assert b != 0, 'AssertionError: Divided by zero ...';
    return a/b;

def main():
    try:
        div(1, 0);
    except Exception as err:
        print('Catch error in main ...')
        raise # relay exception
 
if __name__ == '__main__':
    try:
        main()
    except Exception as err:
        print(err.args, err);
		

#!/usr/bin/python
 
def div(a, b):
    assert b != 0, 'AssertionError: Divided by zero ...';
    return a/b;
 
if __name__ == '__main__':
    try:
        div(1, 0);
    except Exception as err:
        print(err.args, err);
		

# Exception.py
#!/usr/bin/python
 
def getString():
    return "Hello World!"
 
if __name__ == '__main__':
    s = getString();
    assert s == "Hello", "string is not correct ..."
    print(s) # Hello World!
		

#!/usr/bin/python
 
import traceback
 
if __name__ == '__main__':
    try:
        div(1, 0);
    except Exception as err:
        print(err.args, err)
        traceback.print_exc();
		

#!/usr/bin/python
 
class definedExcept(Exception):
    def __int__(self, arg):
        self.args = arg;
 
def div(a, b):
    if b == 0:
        raise definedExcept("Defined Exception ...");
    return a/b;
 
if __name__ == '__main__':
    try:
        div(1, 0);
    except Exception as err:
        print(err.args, err);
		

• Python Tutorial
• Tutorialspoint
• Starting out with Python