Using self.* as default value for a method [duplicate]

Answer 1

Use a default of None and detect that.

def save_file(self, outputfilename=None): 
    if outputfilename is None:
        outputfilename = self.image_filename
    self.file.read(outputfilename)
    ....

Answer 2

The documentation states:

Default parameter values are evaluated when the function definition is executed.

This explains why the instance cannot be referenced. As others have said, use None as your default and fix up the value at function execution time when the instance is available.

Answer 3

def save_file(self, outputfilename = None):
    if not outputfilename:
        outputfilename = self.image_filename 
    self.file.read(outputfilename)
    ....

Answer 4

def save_file(self, outputfilename=None): 
    outputfilename = outputfilename or self.image_filename
    self.file.read(outputfilename)

or even

def save_file(self, outputfilename=None):         
    self.file.read(outputfilename or self.image_filename)

This may be nothing with one variable, but if you have, let's say, 5, this makes code easier to read, in my opinion.