Question

def save_file(self, outputfilename = self.image_filename): 
    self.file.read(outputfilename)
    ....

gives NameError: name 'self' is not defined in the first line. It seems that Python doesn’t accept it. How can I rewrite the code so it doesn’t raise an exception?

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)
    ....