Hi, I can add new variables to user-defined classes like:
>>> class Test: ... pass ... >>> a=Test() >>> a.x=100 but it doesn't work if the instances belong to a built-in class such as str or list: >>> a='abc' >>> a.x=100 Traceback (most recent call last): File "<stdin>", line 1, in <module> AttributeError: 'str' object has no attribute 'x' What makes this difference? Thanks in advance! -- https://mail.python.org/mailman/listinfo/python-list
