Re: [Tutor] Question About the .format Method.

[Peter Otten]

Bryon Adams wrote:

> Hello,
>  Working on a simple function to get an IP address and make it look
> pretty for the PyNet course. I'm wondering if there's way to evenly
> space text with the string.format() method similar to how I'm doing it
> with the % operator. The last two prints keep everything left aligned
> and 20 spaces wide. Is there a way to accomplish this with the .format()
> method that I use in the first print function?

You can left-align, center or right-align with format():

>>> print("| {:<12} | {:^12} | {:>12} |".format("left", "center", "right"))
| left |center|right |

The default is right-align for numbers and left-align for strings:

>>> "{:12}".format(42)
'  42'
>>> "{:12}".format("42")
'42  '

You can find the details here:




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Re: [Tutor] Python Script

[Alan Gauld via Tutor]

On 10/11/16 00:18, Jordan Trudell wrote:
> Hello, I need help running a script, as I am getting an error. 

OK, But we need to know what version of Python and which OS you use.

Also post the script and the full error message you get.
(Don't send attachments because they usually get stripped
by the server, paste the text into your mail and send as
plain text not html.)

Finally, it might help if you tell us exactly how you
are trying to run the script.

-- 
Alan G
Author of the Learn to Program web site
http://www.alan-g.me.uk/
http://www.amazon.com/author/alan_gauld
Follow my photo-blog on Flickr at:
http://www.flickr.com/photos/alangauldphotos


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Re: [Tutor] Question About the .format Method.

[Alan Gauld via Tutor]

On 09/11/16 22:30, Bryon Adams wrote:
> Hello,
>  Working on a simple function to get an IP address and make it look 
> pretty for the PyNet course. I'm wondering if there's way to evenly 
> space text with the string.format() method similar to how I'm doing it 
> with the % operator. 

Yes, read section 6.1.3 of the documentation

https://docs.python.org/3/library/string.html#formatstrings

You can do everything that % formatting can do, and some more.

See the examples in section 6.1.3.2

-- 
Alan G
Author of the Learn to Program web site
http://www.alan-g.me.uk/
http://www.amazon.com/author/alan_gauld
Follow my photo-blog on Flickr at:
http://www.flickr.com/photos/alangauldphotos


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[Tutor] MEL to Python Translation of array index in conditional statement

[Brian Schindler]

I'm trying to convert the following code from MEL (Maya Embedded Language) to 
Python and having trouble with syntax errors in the conditional statement. 
Could you help me out? 

float $pos[3] = `xform -q -rp $obj`;
if ($pos[0] != 0 || $pos[1] != 0 || $pos[2] != 0) 


Brian Schindler 
Professor of Animation 
School of Digital Media 
Savannah College of Art and Design® 
Office: 912.525.8528 Fax: 912.525.8597 
bschi...@scad.edu 

SCAD: The University for Creative Careers® 

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Re: [Tutor] MEL to Python Translation of array index in conditional statement

[Peter Otten]

Brian Schindler wrote:

> I'm trying to convert the following code from MEL (Maya Embedded Language)
> to Python and having trouble with syntax errors in the conditional
> statement. 

What did you try?

> Could you help me out?
> 
> float $pos[3] = `xform -q -rp $obj`;
> if ($pos[0] != 0 || $pos[1] != 0 || $pos[2] != 0)

I don't know MEL. Is xform a commandline tool? In that case you might need 
something along the lines of

output = subprocess.Popen(
["xform", "-q", "-rp", obj], 
stdout=subprocess.PIPE).communicate()[0]
pos = [float(s) for s in output.split()]
if pos[0] or pos[1] or pos[2]:
   ... # whatever


> Brian Schindler
> Professor of Animation

Well, what can I say -- it's never too late to read .
Or  if you prefer the 
classics;)


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Re: [Tutor] MEL to Python Translation of array index in conditional statement

[Steven D'Aprano]

On Thu, Nov 10, 2016 at 08:08:14AM -0500, Brian Schindler wrote:

> I'm trying to convert the following code from MEL (Maya Embedded 
> Language) to Python and having trouble with syntax errors in the 
> conditional statement. Could you help me out?

Only if you help us to help you. I don't know MEL and don't know how to 
read the following:

> float $pos[3] = `xform -q -rp $obj`;
> if ($pos[0] != 0 || $pos[1] != 0 || $pos[2] != 0) 

and chances are nobody else here does either. Can you explain in words 
what it does? If you're getting an error, best to show us the code you 
tried and the FULL error you are getting (copy and paste it please, as 
text, don't post a screenshot).

I'm going to take a wild guess that the code means something like:

pos = an array of four values
if pos[0] != 0 or pos[1] != 0 or pos[2] != 0 then:
call an external program xform with arguments -q -rp obj
convert the result to a floating point value
set pos[3] to that number


which would be something similar to:


import subprocess
if any(pos[:3]):
output = subprocess.check_output(['xform', '-q', '-rp', obj])
pos[3] = float(output)


-- 
Steve
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Re: [Tutor] MEL to Python Translation of array index in conditional statement

[Alan Gauld via Tutor]

On 10/11/16 13:08, Brian Schindler wrote:
> I'm trying to convert the following code from MEL (Maya Embedded Language)
>  to Python

You'll probably get better support fromthe Maya community than here
since most of us don;'t know anything about Maya's language.

>  and having trouble with syntax errors in the conditional statement. 

> float $pos[3] = `xform -q -rp $obj`;
> if ($pos[0] != 0 || $pos[1] != 0 || $pos[2] != 0) 

That is presumably the Maya code?
Unfortunately I don't know exactly what it does - I can make
a guess but that's all it would be. For example, is the
indentation on line 2 significant? (It would be in python)
I'm guessing the backtick(`) mean you are executing an OS command?
If so you'll need the python subprocess module to do the equivalent.

If the 2nd line does what I think, the equivalent Python code would
be something like:

if pos[0] or pos[1] or pos[2]:
# do something here

Can you show us what you tried and what error message(s) you
got(in full)?


-- 
Alan G
Author of the Learn to Program web site
http://www.alan-g.me.uk/
http://www.amazon.com/author/alan_gauld
Follow my photo-blog on Flickr at:
http://www.flickr.com/photos/alangauldphotos


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