In this step, we will modify the get_debugger_func decorator to invoke the interactive debugger after printing the exception traceback.
Your task, once again, is to implement the __debugger__ metaclass.
import inspect, traceback, sys, pdb
def get_debugger_func(func):
def new_func(*args):
try:
return func(*args)
except Exception,e:
traceback.print_exc()
print '-'*80
pdb.post_mortem(sys.exc_traceback)
return new_func
class __debugger__(type):
"""Define this class"""
class Example(object):
__metaclass__ = __debugger__
def divide(self, v):
# exception if v == 0
result = 100 / v
return result
def interpolate(self, *args):
# exception if len(args) != 2
result = "%s is %s!" % args
return result
if __name__ == '__main__':
e = Example()
print e.divide(0)
print '-'*80
print e.interpolate('Feihong', 'very', 'cool')
Expected output:
Traceback (most recent call last):
File "D:\Projects\PyCon 2008 Talks\framework-tutorial\src\metaclass\debugger\solutions\debugger2.py", line 11, in new_func
return func(*args)
File "D:\Projects\PyCon 2008 Talks\framework-tutorial\src\metaclass\debugger\solutions\debugger2.py", line 33, in divide
result = 100 / v
ZeroDivisionError: integer division or modulo by zero
--------------------------------------------------------------------------------
> d:\projects\pycon 2008 talks\framework-tutorial\src\metaclass\debugger\solutions\debugger2.py(33)divide()
-> result = 100 / v
(Pdb) c
None
--------------------------------------------------------------------------------
Traceback (most recent call last):
File "D:\Projects\PyCon 2008 Talks\framework-tutorial\src\metaclass\debugger\solutions\debugger2.py", line 11, in new_func
return func(*args)
File "D:\Projects\PyCon 2008 Talks\framework-tutorial\src\metaclass\debugger\solutions\debugger2.py", line 38, in interpolate
result = "%s is %s!" % args
TypeError: not all arguments converted during string formatting
--------------------------------------------------------------------------------
> d:\projects\pycon 2008 talks\framework-tutorial\src\metaclass\debugger\solutions\debugger2.py(38)interpolate()
-> result = "%s is %s!" % args
(Pdb)
Hints:
Solution: debugger2.py