What is the bug with mutable default arguments in Python, and how do you fix it?
1 2 3 4 5 6 7 8 9 10 11 | # ====================================================================== # Q: What is the bug with mutable default arguments in Python, and how do you # fix it? # ====================================================================== def add(item, bucket=[]): # WRONG: the list is created once bucket.append(item); return bucket def add(item, bucket=None): # CORRECT bucket = [] if bucket is None else bucket bucket.append(item); return bucket |
