Re: Re: Generators, generator expressions, and loops

Lovely, succinct answers. On 17/11/2018 2:44 AM, Ian Kelly wrote: On Fri, Nov 16, 2018 at 7:57 AM Steve Keller wrote: I have looked at generators, generator expressions, and iterators and I try to get more familiar with these. 1. How would I loop over all (with no upper bound) integers or al

Re: Python Interpreters In Eclipse

Il 16/11/2018 21:08, Jaxson Baerg ha scritto: Hey, I'm attempting to use python in eclipse and am having trouble with the python interpreter. I am using Eclipse 2018-09 and the latest PyDev and Python 3.7.1. When declaring python-3.7.1.exe as an interpreter it gives an error saying it was unable

Python Interpreters In Eclipse

Hey, I'm attempting to use python in eclipse and am having trouble with the python interpreter. I am using Eclipse 2018-09 and the latest PyDev and Python 3.7.1. When declaring python-3.7.1.exe as an interpreter it gives an error saying it was unable to get info on the interpreter. It also says a p

Re: IDLE Default Working Directory

> On Nov 15, 2018, at 2:44 PM, eryk sun wrote: > > On 11/14/18, Irv Kalb wrote: >> >> When working with data files, I tell students to put their project (their >> main program and any other related files) in a folder. Then, in their calls >> to "open", I tell them to just give the name of th

Re: Generators, generator expressions, and loops

> On 16 Nov 2018, at 14:54, Steve Keller wrote: > More elegant are generator expressions but I cannot think of a way > without giving an upper limit: > >for i in (2 ** i for i in range(100)): >... > > which looks ugly. Also, the double for-loop (and also the two loops > in the

Re: Generators, generator expressions, and loops

Try itertools.count() . On Fri, Nov 16, 2018 at 12:08 PM Steve Keller wrote: > Cancel ill-formated article > -- > https://mail.python.org/mailman/listinfo/python-list > -- Santiago Basulto.- Co-founder @ rmotr.com -- https://m

Re: Why do integers compare equal to booleans?

> Because Python used not to have a boolean type and used the integers 0 and 1 instead Exactly as Jon says. I wrote a post some time ago with more info about it: https://blog.rmotr.com/those-tricky-python-booleans-2100d5df92c On Fri, Nov 16, 2018 at 12:23 PM duncan smith wrote: > On 16/11/18 14

Re: Generators, generator expressions, and loops

On Fri, Nov 16, 2018 at 7:57 AM Steve Keller wrote: > > I have looked at generators, generator expressions, and iterators and > I try to get more familiar with these. > > 1. How would I loop over all (with no upper bound) integers or all > powers of two, for example? > > In C it would be > >fo

Re: Iterators of iterators

On Fri, Nov 16, 2018 at 8:01 AM Steve Keller wrote: > > I wonder why iterators do have an __iter__() method? I thought > iterable objects would have an __iter__() method (but no __next__()) > to create an iterator for it, and that would have the __next__() > method but no __iter__(). > > $ py

RE: Why do integers compare equal to booleans?

A boolean type didn't come about until version 2.3, and even now they still inherit from integers. Some links for you: https://docs.python.org/3.7/whatsnew/2.3.html#pep-285-a-boolean-type https://docs.python.org/3.7/library/stdtypes.html#boolean-values https://docs.python.org/3.7/reference/datam

Re: Why do integers compare equal to booleans?

On 16/11/18 14:51, Steve Keller wrote: > Why do the integers 0 and 1 compare equal to the boolean values False > and True and all other integers to neither of them? > > $ python3 > Python 3.5.2 (default, Nov 12 2018, 13:43:14) > [GCC 5.4.0 20160609] on linux > Type "help", "copyrig

Re: Why do integers compare equal to booleans?

On 2018-11-16, Steve Keller wrote: > Why do the integers 0 and 1 compare equal to the boolean values False > and True and all other integers to neither of them? Because Python used not to have a boolean type and used the integers 0 and 1 instead, so when the boolean type was introduced True and F

Generators, generator expressions, and loops

Cancel ill-formated article -- https://mail.python.org/mailman/listinfo/python-list

Iterators of iterators

I wonder why iterators do have an __iter__() method? I thought iterable objects would have an __iter__() method (but no __next__()) to create an iterator for it, and that would have the __next__() method but no __iter__(). $ python3 Python 3.5.2 (default, Nov 12 2018, 13:43:14) [GCC 5

Generators, generator expressions, and loops

I have looked at generators, generator expressions, and iterators and I try to get more familiar with these. 1. How would I loop over all (with no upper bound) integers or all powers of two, for example? In C it would be for (int i = 0; ; i++) { ... } or for (int i = 1; ; i *= 2) { ... } I

Generators, generator expressions, and loops

I have looked at generators, generator expressions, and iterators and I try to get more familiar with these. 1. How would I loop over all (with no upper bound) integers or all powers of two, for example? In C it would be for (int i = 0; ; i++) { ... } or for (int i = 1; ; i *= 2) { ... } I

Why do integers compare equal to booleans?

Why do the integers 0 and 1 compare equal to the boolean values False and True and all other integers to neither of them? $ python3 Python 3.5.2 (default, Nov 12 2018, 13:43:14) [GCC 5.4.0 20160609] on linux Type "help", "copyright", "credits" or "license" for more information.