class vs function ???

From: Gaurav Veda (gveda_at_iitk.ac.in)
Date: 02/21/04 

Date: 21 Feb 2004 08:57:44 -0800

Hi !

I am a poor mortal who has become terrified of Python. It seems to
have thrown all the OO concepts out of the window. Penniless, I ask a
basic question :
What is the difference between a class and a function in Python ???
Consider the following code fragments :
# Fragment 1 begins

a = 1
print a
def fun1():
    global b
    b = "inside fun1"
    print b
fun1()
def c1():
    print a
    print b
    c = 12
    def fun2():
        global d
        d = "We are dead !!!"
        print d
    fun2()
c1()
class c2:
    pass
print d
print c

# Fragment 1 ends
# Fragment 2 begins
a = 1
print a
def fun1():
    global b
    b = "inside fun1"
    print b
fun1()
class c1:
    print a
    print b
    c = 12
    def fun2():
        global d
        d = "We are dead !!!"
        print d
    fun2()
class c2:
    pass

print d
print c

# Fragment 2 ends

The output of both these codes are precisely the same ! (including the
error because of 'print c')

The sample output is :
1
inside fun1
1
inside fun1
We are dead !!!
We are dead !!!
Traceback (most recent call last):
  File "XYZ.py", line 21, in ?
    print c
NameError: name 'c' is not defined

Waiting for some 'logical' explanation !!!

Gaurav

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