On Thu, Aug 30, 2018 at 3:02 AM Wes Turner <wes.tur...@gmail.com> wrote:
> > By default, the sorted function looks at the leftmost element of a tuple > or other iterable, when sorting... > > You're right, my presentation is unclear. I'll fix it. The way it reads, it seems like you're implying that sorted() does this: > > Yes, and that's wrong. > >>> l = [(3, 2), (3, 1), (1, 1, 2), (1, 1)] > >>> sorted(l, key=lambda x: x[0]) > [(1, 1, 2), (1, 1), (3, 2), (3, 1)] > > > > You'll find some excellent overview of the magic methods in this essay > by Rafe Kettler: A Guide to Python's Magic Methods. He's mostly looking at > Python 2.7, so does not pick up on the __next__ method, however you'll be > able to fill in the blanks thanks to this course > > This is unclear to me. What does the next() function do? How do I find the > docs and source for it? > > next(obj) triggers obj.__next__() which in 2.7 is named next internally i.e. isn't magic. __next__ is the main driver of iterators e.g. for loops hit __next__ over and over as they loop over whatever. True, a list (iterable) doesn't have a __next__, but a for loop implicitly applies __iter__ (called by the iter function) which turns iterables into iterators. > These are misspelled: > > > comparitor > > compartor > > Will fix next. > These are great: > - http://www.scipy-lectures.org/intro/language/python_language.html > - > http://nbviewer.jupyter.org/github/jrjohansson/scientific-python-lectures/blob/master/Lecture-1-Introduction-to-Python-Programming.ipynb > - Something about sorted with a link to the docs would be a good > addition. > > Thanks. Yes, I'll add some links to the docs as you suggest. Great feedback! Actually as part of my class I'm showing them edu-sig and other python.org lists, so we were actually viewing this conversation. I'll extend that to showing your corrections, as I want to demonstrate how the Python community all teaches each other, is friendly and so on. Kirby
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