Why such structure
class A:
def __init__(self, a):
self.a = a
def p(self, b=self.a):
print b
gives an error NameError: name 'self' is not defined?
Default argument values are evaluated at function define-time, but self is an argument only available at function call time. Thus arguments in the argument list cannot refer each other.
It's a common pattern to default an argument to None and add a test for that in code:
def p(self, b=None):
if b is None:
b = self.a
print b
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