Re: Puzzling difference between lists and tuples

2020-09-21 Thread Chris Angelico
On Mon, Sep 21, 2020 at 10:14 PM Serhiy Storchaka wrote: > > 18.09.20 03:55, Chris Angelico пише: > > On Fri, Sep 18, 2020 at 10:53 AM Grant Edwards > > wrote: > >> Yea, the syntax for tuple literals has always been a bit of an ugly > >> spot in Python. If ASCII had only had one more set of open

Re: Puzzling difference between lists and tuples

2020-09-21 Thread Serhiy Storchaka
18.09.20 03:55, Chris Angelico пише: > On Fri, Sep 18, 2020 at 10:53 AM Grant Edwards > wrote: >> Yea, the syntax for tuple literals has always been a bit of an ugly >> spot in Python. If ASCII had only had one more set of open/close >> brackets... > > ... then I'd prefer them to be used for set

Re: Puzzling difference between lists and tuples

2020-09-20 Thread Cameron Simpson
On 20Sep2020 20:33, Avi Gross wrote: >('M','R','A','B') is correct. I appreciate the correction. I did not look to >see the content of what I created, just the type! > a = tuple("first") a >('f', 'i', 'r', 's', 't') type(a) > > >But I thought adding a comma would help and it does no

RE: Puzzling difference between lists and tuples

2020-09-20 Thread Avi Gross via Python-list
iterator is iterating at a different level. >>> d = ["first"] >>> tuple(d) ('first',) >>> tuple(["first"]) ('first',) I understand the design choice and can imagine there may be another function that initializes a tuple more directly in

Re: Puzzling difference between lists and tuples

2020-09-20 Thread Greg Ewing
On 21/09/20 10:59 am, Avi Gross wrote: a=tuple("first") type(a) That seems more explicit than adding a trailing comma. It doesn't do what you want, though: >>> a = tuple("first") >>> print(a) ('f', 'i', 'r', 's', 't') If you really want to use tuple() to create a 1-tuple without using a tr

Re: Puzzling difference between lists and tuples

2020-09-20 Thread MRAB
On 2020-09-20 23:59, Avi Gross via Python-list wrote: There is a simple and obvious way to make sure you have a tuple by invoking the keyword/function in making it: a=('first') type(a) a=("first",) type(a) a=tuple("first") type(a) That seems more explicit than adding a trailing comm

RE: Puzzling difference between lists and tuples

2020-09-20 Thread Avi Gross via Python-list
t seems more explicit than adding a trailing comma. It also is a simple way to make an empty tuple but is there any penalty for using the function tuple()? -Original Message- From: Python-list On Behalf Of "???" Sent: Saturday, September 19, 2020 11:39 PM To: python-list

sorry for typo (Was: Re: Puzzling difference between lists and tuples)

2020-09-19 Thread 황병희
> #+BEGIN_SRC: python > for n in ('first',): > print n > #+BEGIN_SRC The last 'BEGIN_SRC' should be 'END_SRC' so sorry ;;; -- ^고맙습니다 _救濟蒼生_ 감사합니다_^))// -- https://mail.python.org/mailman/listinfo/python-list

Re: Puzzling difference between lists and tuples

2020-09-19 Thread 황병희
William Pearson writes: > ... > for n in ('first'): > print n > > > ... but "f","i","r","s","t" in the second. #+BEGIN_SRC: python for n in ('first',): print n #+BEGIN_SRC Then, that will print 'first'. And please use Python3... Sincerely, Byung-Hee -- ^고맙습니다 _救濟蒼生_ 감사합니다_^))// -- h

Re: Puzzling difference between lists and tuples

2020-09-18 Thread Greg Ewing
On 19/09/20 6:49 am, Grant Edwards wrote: There must be a few more sets of brackets in Unicode... Quite a lot, actually. The character browser in MacOSX is currently showing me 17, not including the ones that are built up from multiple characters. Some of them could be easily confused with no

Re: Puzzling difference between lists and tuples

2020-09-18 Thread Grant Edwards
On 2020-09-18, Chris Angelico wrote: > On Fri, Sep 18, 2020 at 10:53 AM Grant Edwards > wrote: >> >> On 2020-09-17, MRAB wrote: >> >> The only time the parentheses are required for tuple building is when >> >> they would otherwise not be interpreted that way: >> >> >> > They're needed for the emp

Re: Puzzling difference between lists and tuples

2020-09-17 Thread Chris Angelico
On Fri, Sep 18, 2020 at 10:53 AM Grant Edwards wrote: > > On 2020-09-17, MRAB wrote: > >> The only time the parentheses are required for tuple building is when > >> they would otherwise not be interpreted that way: > >> > > They're needed for the empty tuple, which doesn't have a comma. > > > >>

Re: Puzzling difference between lists and tuples

2020-09-17 Thread Grant Edwards
On 2020-09-17, MRAB wrote: >> The only time the parentheses are required for tuple building is when >> they would otherwise not be interpreted that way: >> > They're needed for the empty tuple, which doesn't have a comma. > >> some_func('first', 'second') # some_func called with two str args >>

Re: Puzzling difference between lists and tuples

2020-09-17 Thread Ethan Furman
On 9/17/20 10:43 AM, MRAB wrote: On 2020-09-17 17:47, Ethan Furman wrote: The only time the parentheses are required for tuple building is when they would otherwise not be interpreted that way: They're needed for the empty tuple, which doesn't have a comma. Ah, right. Thanks. -- ~Ethan~

Re: Puzzling difference between lists and tuples

2020-09-17 Thread MRAB
On 2020-09-17 17:47, Ethan Furman wrote: On 9/17/20 8:24 AM, William Pearson wrote: I am puzzled by the reason for this difference between lists and tuples. A list of with multiple strings can be reduced to a list with one string with the expected results: for n in ['first']: print n

Re: Puzzling difference between lists and tuples

2020-09-17 Thread Richard Damon
On 9/17/20 11:24 AM, William Pearson wrote: > I am puzzled by the reason for this difference between lists and tuples. > > A list of with multiple strings can be reduced to a list with one string with > the expected results: > > for n in ['first','second']: > print n > > for n in ['first']: >

Re: Puzzling difference between lists and tuples

2020-09-17 Thread Ethan Furman
On 9/17/20 8:24 AM, William Pearson wrote: I am puzzled by the reason for this difference between lists and tuples. A list of with multiple strings can be reduced to a list with one string with the expected results: for n in ['first']: print n ['first'] is a list. for n in ('first'

Re: Puzzling difference between lists and tuples

2020-09-17 Thread 2QdxY4RzWzUUiLuE
On 2020-09-17 at 09:24:57 -0600, William Pearson wrote: > for n in ('first'): That's not a tuple. That's a string. Try it this way: for n in ('first',): # note the trailing comma print n Dan -- https://mail.python.org/mailman/listinfo/python-list