King schrieb:
class A(object):
    def __init__(self, value=0.):
        self.value = value

class B(A):
    def __init__(self, value=None):
        A.__init__(self)
        self.value = value

obj = B()

When "B" initializes, it overwrite "value" variable of "A". How do I
make sure that no variable should not be defined with names of "A" in
"B"?

To avoid these kinds of clashes, you can use the double-undescore syntax. It will create a mangled name that looks like

_module_class_variablename


By this, the two different variable get distinct names.

*However*, this is neither a proper way of making variables private, nor are name-clashes something that should arise more than every now-and-then.

Instead, try rather renaming value to something more meaningful.

Diez
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