Calling a class function inside of init

Question

I m writing some code that takes a filename  opens the file  and parses out some data  I d like to do this in a class  The following code works   class MyClass        def   init   self  filename           self filename   filename           self stat1   None         self stat2   None         self stat3   None         self stat4   None         self stat5   None          def parse file                 do some parsing             self stat1   result from parse1             self stat2   result from parse2             self stat3   result from parse3             self stat4   result from parse4             self stat5   result from parse5          parse file     But it involves me putting all of the parsing machinery in the scope of the   init   function for my class  That looks fine now for this simplified code  but the function parse file has quite a few levels of indention as well  I d prefer to define the function parse file   as a class function like below   class MyClass        def   init   self  filename           self filename   filename           self stat1   None         self stat2   None         self stat3   None         self stat4   None         self stat5   None         parse file        def parse file             do some parsing         self stat1   result from parse1         self stat2   result from parse2         self stat3   result from parse3         self stat4   result from parse4         self stat5   result from parse5   Of course this code doesn t work because the function parse file   is not within the scope of the   init   function  Is there a way to call a class function from within   init   of that class  Or am I thinking about this the wrong way

User · Answer

How about   class MyClass object       def   init   self  filename           self filename   filename          self stats   parse file filename   def parse file filename        do some parsing     return results from parse   By the way  if you have variables named stat1  stat2  etc   the situation is begging for a tuple  stats           So let parse file return a tuple  and store the tuple in self stats   Then  for example  you can access what used to be called stat3 with self stats 2

User · Answer

If I m not wrong  both functions are part of your class  you should use it like this   class MyClass        def   init   self  filename           self filename   filename           self stat1   None         self stat2   None         self stat3   None         self stat4   None         self stat5   None         self parse file        def parse file self            do some parsing         self stat1   result from parse1         self stat2   result from parse2         self stat3   result from parse3         self stat4   result from parse4         self stat5   result from parse5   replace your line   parse file      with   self parse file

User · Answer

I think that your problem is actually with not correctly indenting init function It should be like this  class MyClass         def   init   self  filename             pass       def parse file              pass

User · Answer

Call the function in this way   self parse file     You also need to define your parse file   function like this   def parse file self     The parse file method has to be bound to an object upon calling it  because it s not a static method   This is done by calling the function on an instance of the object  in your case the instance is self

User · Answer

In parse file  take the self argument  just like in   init     If there s any other context you need then just pass it as additional arguments as usual

User · Answer

You must declare parse file like this  def parse file self   The  self  parameter is a hidden parameter in most languages  but not in python  You must add it to the definition of all that methods that belong to a class  Then you can call the function from any method inside the class using self parse file  your final program is going to look like this   class MyClass      def   init   self  filename         self filename   filename         self stat1   None       self stat2   None       self stat3   None       self stat4   None       self stat5   None       self parse file      def parse file self          do some parsing       self stat1   result from parse1       self stat2   result from parse2       self stat3   result from parse3       self stat4   result from parse4       self stat5   result from parse5

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