On Dec 31, 2013 2:37 PM, "spir" <denis.s...@gmail.com> wrote: > > Hello, > > I don't remember exactly how to do that. As an example: > > class Source (str): > __slots__ = ['i', 'n'] > def __init__ (self, string): > self.i = 0 # current matching index in source > self.n = len(string) # number of ucodes (Unicode code points) > #~ str.__init__(self, string) > > I thought I needed to call str's __init__, as in the line comented out, but (1) python refuses with a TypeError (2) all seems to work fine (meaning, the string is well stored, *implicitely*). Am I missing some point, or is this the way to do? How does it work? I particular, how does python know which param to take as source string? (There could be other params to __init__.)
The underlying built-in object is created by str.__new__ before __init__ is called. If you override __new__ you'll need to defer to str.__new__ and can choose to intercept the arguments and replace them. Oscar
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