Re: For Loop Dilema [python-list]

[arya . kumar2494]

On Monday, February 26, 2018 at 12:57:25 PM UTC+5:30, Chris Angelico wrote:
> On Mon, Feb 26, 2018 at 5:19 AM,   wrote:
> > Why we don’t use:
> >
> > for _ in _ in _
> >
> > Instead of
> >
> > for _ in _:
> > for _ in _:
> >
> > Ex:
> >
> > Names = ["Arya","Pupun"]
> >
> > for name in Names:
> >for c in name:
> >print(c)
> >
> > instead use:
> >
> > for c in name in Names:
> > print(c)
> 
> Because programming is all about building up a program from
> primitives. The number of times when we need this kind of nested loop
> (with absolutely nothing in between the loops) is way too small to
> justify dedicated syntax.
> 
> ChrisA

Thank you.
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Re: For Loop Dilema [python-list]

[arya . kumar2494]

On Monday, February 26, 2018 at 6:23:24 AM UTC+5:30, Rick Johnson wrote:
> On Sunday, February 25, 2018 at 12:19:56 PM UTC-6, arya.ku...@gmail.com wrote:
> 
> > Ex:
> > 
> > Names = ["Arya","Pupun"]
> > 
> > for name in Names:
> >for c in name:
> >print(c)
> > 
> > instead use:
> > 
> > for c in name in Names:
> > print(c)
> 
> Hmm. Why stop there?
> 
> bit = ["kibbles"]
> bits = [bit, bit]
> bitts = [bits, bits]
> for kibbles in bit in bits in bitts:
> do_something(kibbles)

My thought exactly.. :)
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Re: For Loop Dilema [python-list]

[arya . kumar2494]

On Monday, February 26, 2018 at 6:20:06 AM UTC+5:30, Ian wrote:
> On Sun, Feb 25, 2018 at 11:19 AM,   wrote:
> > Why we don’t use:
> >
> > for _ in _ in _
> >
> > Instead of
> >
> > for _ in _:
> > for _ in _:
> >
> > Ex:
> >
> > Names = ["Arya","Pupun"]
> >
> > for name in Names:
> >for c in name:
> >print(c)
> >
> > instead use:
> >
> > for c in name in Names:
> > print(c)
> 
> It doesn't seem very intuitive (doesn't follow proper English
> phrasing, for instance) and I don't think it's a common enough
> situation to warrant adding a special syntax for it. But if you really
> want it, you could use something like this:
> 
> def double_for(iterable):
> for outer in iterable:
> yield from outer
> 
> for c in double_for(Names):
> print(c)
> 
> But I don't think this is any clearer than making the loops explicit.

Thank you.
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Re: For Loop Dilema [python-list]

[arya . kumar2494]

On Monday, February 26, 2018 at 8:51:35 PM UTC+5:30, Ian wrote:
> On Sun, Feb 25, 2018 at 8:05 PM, INADA Naoki  wrote:
> > https://docs.python.org/3.6/library/itertools.html#itertools.product
> 
> I don't see how you would use itertools.product to do what the OP
> asked for. You could use itertools.chain.from_iterable, though:
> 
> py> names = ['Jack', 'Susan']
> py> list(chain.from_iterable(names))
> ['J', 'a', 'c', 'k', 'S', 'u', 's', 'a', 'n']

if you want to access a dict per say insisde a list or maybe some data i.e deep 
nested in some mixture of ds wont it be relevant to use a single for statement 
to query the data out.(Just a thought)
Students = [{"name":John,"age":16},{"name":Maria,"age":18}]

for info in student in Students:
 print(student[info])



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Re: For Loop Dilema [python-list]

[Ian Kelly]

On Sun, Feb 25, 2018 at 8:05 PM, INADA Naoki  wrote:
> https://docs.python.org/3.6/library/itertools.html#itertools.product

I don't see how you would use itertools.product to do what the OP
asked for. You could use itertools.chain.from_iterable, though:

py> names = ['Jack', 'Susan']
py> list(chain.from_iterable(names))
['J', 'a', 'c', 'k', 'S', 'u', 's', 'a', 'n']
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Re: For Loop Dilema [python-list]

[Chris Angelico]

On Mon, Feb 26, 2018 at 5:19 AM,   wrote:
> Why we don’t use:
>
> for _ in _ in _
>
> Instead of
>
> for _ in _:
> for _ in _:
>
> Ex:
>
> Names = ["Arya","Pupun"]
>
> for name in Names:
>for c in name:
>print(c)
>
> instead use:
>
> for c in name in Names:
> print(c)

Because programming is all about building up a program from
primitives. The number of times when we need this kind of nested loop
(with absolutely nothing in between the loops) is way too small to
justify dedicated syntax.

ChrisA
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Re: For Loop Dilema [python-list]

[INADA Naoki]

https://docs.python.org/3.6/library/itertools.html#itertools.product

On Mon, Feb 26, 2018 at 3:19 AM,   wrote:
> Why we don’t use:
>
> for _ in _ in _
>
> Instead of
>
> for _ in _:
> for _ in _:
>
> Ex:
>
> Names = ["Arya","Pupun"]
>
> for name in Names:
>for c in name:
>print(c)
>
> instead use:
>
> for c in name in Names:
> print(c)
> --
> https://mail.python.org/mailman/listinfo/python-list



-- 
INADA Naoki  
-- 
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Re: For Loop Dilema [python-list]

[Rick Johnson]

On Sunday, February 25, 2018 at 12:19:56 PM UTC-6, arya.ku...@gmail.com wrote:

> Ex:
> 
> Names = ["Arya","Pupun"]
> 
> for name in Names:
>for c in name:
>print(c)
> 
> instead use:
> 
> for c in name in Names:
>   print(c)

Hmm. Why stop there?

bit = ["kibbles"]
bits = [bit, bit]
bitts = [bits, bits]
for kibbles in bit in bits in bitts:
do_something(kibbles)
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Re: For Loop Dilema [python-list]

[Ian Kelly]

On Sun, Feb 25, 2018 at 11:19 AM,   wrote:
> Why we don’t use:
>
> for _ in _ in _
>
> Instead of
>
> for _ in _:
> for _ in _:
>
> Ex:
>
> Names = ["Arya","Pupun"]
>
> for name in Names:
>for c in name:
>print(c)
>
> instead use:
>
> for c in name in Names:
> print(c)

It doesn't seem very intuitive (doesn't follow proper English
phrasing, for instance) and I don't think it's a common enough
situation to warrant adding a special syntax for it. But if you really
want it, you could use something like this:

def double_for(iterable):
for outer in iterable:
yield from outer

for c in double_for(Names):
print(c)

But I don't think this is any clearer than making the loops explicit.
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