Hi all I have often read about the gotcha regarding 'mutable default arguments' that frequently trips people up.
I use them from time to time, but I have never had a problem. I have just delved a bit deeper to see if I am skating on thin ice. AFAICT my usage is safe. If I use a list as an argument, I only use it to pass values *into* the function, but I never modify the list. So if I omit the argument, the original default empty list is used, otherwise the list that I pass in is used. However, every time I look at my own code, and I see "def x(y, z=[]): ....." it looks wrong because I have been conditioned to think of it as a gotcha. Would it be more pythonic to change them all to use the alternative "z=None", or is it ok to leave it as it is? Or to phrase it differently, how would an experienced pythonista react on seeing this when reviewing my code? Thanks Frank Millman -- https://mail.python.org/mailman/listinfo/python-list
