On Tue, Sep 27, 2016 at 10:01 AM, Chris Angelico <ros...@gmail.com> wrote: > On Wed, Sep 28, 2016 at 12:01 AM, Peng Yu <pengyu...@gmail.com> wrote: >> Hi, In many other functional language, one can change the closure of a >> function. Is it possible in python? >> >> http://ynniv.com/blog/2007/08/closures-in-python.html >> > > From the blog post: > > """In some languages, the variable bindings contained in a closure > behave just like any other variables. Alas, in python they are > read-only.""" > > This is not true, at least as of Python 3.
So in Python 2, this is true? > def makeInc(x): > def inc(y, moreinc=0): > # x is "closed" in the definition of inc > nonlocal x > x += moreinc > return y + x > return inc > > The 'nonlocal' keyword is like 'global', applying only to assignments > (the blog post already mentions the possibility of mutating an object > rather than reassigning it), and permitting assignment into a broader > scope than the function's locals. You can also have multiple closures > in the same context, and changes made by one of them will affect the > others. > > ChrisA > -- > https://mail.python.org/mailman/listinfo/python-list -- Regards, Peng -- https://mail.python.org/mailman/listinfo/python-list
