locate the errors in defining class

[python101]

class Dialog:
 
    def Dialog(self):
        self._dial = 'exit'
 
    def change(self)
        index = self.index('x')
        self._dial[index]='e'
 
    def __str__(self):
        print 'this is ' +self._dial
 
 

There were several errors but I could not fix, please help me.

I just began learning defining a class and really being trouble in understanding.

[python101]

I figured out how to do fix the errors.

[bartonc]

I figured out how to do fix the errors.

You are well on your way to learning! Here are some comments and a working class:

class Dialog:
    # the contructor is called automatically and is named __init__
##    def Dialog(self):
    def __init__(self):
        self._dial = 'exit'
 
    # I like all of the __builtin__ methods togeter
    def __str__(self):
##        print 'this is ' + self._dial
        # str is called by the print statement
        return 'this is ' + self._dial
 
##    def change(self)
##    Missing :
    def change(self):
##        index = self.index('x')
        # don't use reserved words as variable names
        # remember to put the variable in
        idx = self._dial.index('x')
        # use spaces consistantly for readability
##        self._dial[idx] = 'e'
        # strings are not mutable!
        # slice up to idx, add 'e', slice one past idx and add that
        self._dial = self._dial[:idx] + 'e' + self._dial[idx + 1:]
 
 
d = Dialog()  # bad name for a class because it's used in other packages
print d
d.change()
print d