As I try to implement things with getattr, I am getting a really strange
error. This is my file:
#!/usr/bin/env python
# -*- encoding:utf-8 -*-
class global_variables:
"Holds class attributes, so that other classes can share them"
products = 0
best_bundle = []
class dispatcher:
def GetMethod(self,class_name,method_name):
"""This method first finds a class if desired classexists.
Then, instansites it, and returns a reference to desired method
of
the instance it created.
"""
from sys import modules
module = modules[self.__module__]
if hasattr(module,class_name):
print "#debug : hasattr is true"
cls = getattr(module,class_name)
else:
print "#debug : hasattr is false"
return None
"if we get a valid class, lets instantie it"
if cls:
a=cls()
else:
return None
return hasattr(a,method_name) and getattr(a,method_name) or None
def dispatch_command(self):
"""Gets command from user, finds appropriate Class/method to run
and then runs it. Beware of the fact that, to be able to
successfully
run the method, method should take exactly two arguments,
arg 1: instance of class which method resides (e.g. self)
arg 2: list of other needed variables
list of other variables can be used to get as many variables as
possible
"""
command = raw_input(">>>")
args = command.split(" ")
if len(args) < 2:
return None
method = self.GetMethod(args[0],args[1])
return method and method(args[2:]) or None
class calculate(global_variables):
def bundle(self,args):
print "your best bundle is -->"
a = dispatcher()
a.dispatch_command()
I wanted to see what happens when someone gives an nonexistent function.
But when I put a b, it gives me error, when I put c d it doesn't. I
don't have either a or c classes, but a somehow causes problems :S This
is what I did:
yasar@yasar-laptop:~/best_buy> ./main.py
>>>a b
#debug : hasattr is true
Traceback (most recent call last):
File "./main.py", line 57, in <module>
a.dispatch_command()
File "./main.py", line 44, in dispatch_command
method = self.GetMethod(args[0],args[1])
File "./main.py", line 25, in GetMethod
a=cls()
AttributeError: dispatcher instance has no __call__ method
yasar@yasar-laptop:~/best_buy> ./main.py
>>>c d
#debug : hasattr is false
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