can you tell me what is the error in that example

[Hatem El-Zanaty]

hi can you tell me what is the error in that example

#!/usr/bin/python
class example(object):
  def foo(who):       # defined for only 1 argument
    print 'Hello', who
  def test(who):
    self.foo(who)

obj=example()
obj.test("hatem")

it gives this error message

[shang1@localhost ~]$ '/data/python/function.py'
Traceback (most recent call last):
  File "/data/python/function.py", line 9, in ?
    obj.test("hatem")
TypeError: test() takes exactly 1 argument (2 given)
[shang1@localhost ~]$

how come there is 2 arguments given I passed only one in code
please help me to fix it
thanks in advance
hatem gamal

[Shawn Willden]

The test() method only takes a single argument, "who". Calling
obj.test("hatem") calls test with two parameters, obj and "hatem".

I think you wanted to define your test method as:

def test(self, who):
self.foo(who)

The foo method also needs a self parameter.

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[Adriano Monteiro Marques]

Hello,

The problem is that the method takes self as the first argument. self
is an argument pointing to the instance of the object from which the
method was called. To solve your problem, just do the following:

#!/usr/bin/python
class example(object):
def foo(self, who): # defined for only 1 argument
print 'Hello', who
def test(self, who):
self.foo(who)

obj=example()
obj.test("hatem")

That will do ;-)

Kind Regards,

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[Hatem El-Zanaty]

thanks all,
i now understand