python exceptions
-----------------
try/except
try/finally
assert
raise
with/as
======================
======================
(a,b) = (6,0)
try:
        g = a/b
except ZeroDivisionError:
        print ("This is a Div by Zero err")
======================
var = value
try:
        blah
except:
        bleh
else:
        blugh
======================
var = value
try:
        blah
finally:
        bluuugh
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import sys
try:
        untrusted.execute()
except:
        e = sys.exc_info()[0]
        write_to_page( "<p>Error: %s</p>" % e )
======================
try:
        do_some_stuff()
except:
        rollback()
        raise
else:
        commit()
======================
try:
        fh = open("testfile", "w")
        fh.write("......")
finally:
        print "error: cant find file"
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try:
        a,b,c = d
except Exception as e:
        e.args += (d,)
        raise
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#!/usr/bin/python
def Kelvin(Temp):
        assert (Temp >= 0), "Colder than 0"
        return ((Temp-273)*1.8)+32
print Kelvin(273)
print int(Kelvin(505,78))
print Kelvin(-5)
======================
try:
        fh = open("testfile", "w'")
        fh.write("This is my test file")
except IOError:
        print "Error: ....."
else:
        print "Written content in the file successfully"
        fh.close()
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def functionName( level ):
        if level < 1:
                raise "invalid level", level
                #code below this will not be executed
======================
class NetworkError(RuntimeError):
        def __init__(self, arg):
                self.args = arg
try:
        raise Networkerror("bad hostname")
except Networkerror,e:
        print e.args
======================