[BangPypers] Truth Tests (bool)

Senthil Kumaran senthil at uthcode.com
Sat Jan 14 00:49:10 CET 2012

On Sat, Jan 14, 2012 at 12:20:11AM +0530, Noufal Ibrahim wrote:
> > len() method is just a shortcut to __len__ magic method .So when you
> > call len() on your own container type ,it does not traverse whole
> > sequence ,it just calls __len__ method and returns value(assume
> > self.size=0 in constructor) from this method.This value incremented or
> > decremented in add and remove method on your container type.
> This is an interesting point especially with Python3 returning something
> other than lists for things like dict.keys. I'll dig into this a
> little. 

Yeah, dict view or in general the concept of memoryview, but they do
have len().


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