Re: [Tutor] Hi all: How do I save a file in a designated folder?

[Alan Gauld via Tutor]

On 03/05/17 00:28, Cameron Simpson wrote:

>> And so forth? I assume you mean
>>
>> MMDD.png format?
>>
>> You should read about the strftime function in the time
> 
> Further to this, I would also advocate that you consider writing the 
> timestamp 
> from largest unit to smallest unit, like an ISO8601 timestamp, which 
> typically 
> looks like:
> 
>   MMDD.png

Yes, I absolutely second this advice and should have included it.
ISO dates make programming life so much easier!


-- 
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] Hi all: How do I save a file in a designated folder?

[eryk sun]

On Tue, May 2, 2017 at 6:09 PM, Michael C
 wrote:
> screenshot.save("\test\missed.png")

You probably know that "\t" represents a tab in a string literal, but
there's something about working with a path that causes people to
overlook this. Windows won't overlook it. Control characters, i.e.
characters with an ordinal value below 32, are forbidden in Windows
file names.

Also, you're depending on whatever drive or UNC path is the current
directory. For example:

>>> os.chdir('C:\\')
>>> os.path.abspath('/test/missed.png')
'C:\\test\\missed.png'

>>> os.chdir('localhost\C$')
>>> os.path.abspath('/test/missed.png')
'localhost\\C$\\test\\missed.png'

A fully-qualified path must start with the drive or UNC share. For example:

>>> os.path.abspath('C:/test/missed.png')
'C:\\test\\missed.png'

>>> os.path.abspath('//localhost/C$/test/missed.png')
'localhost\\C$\\test\\missed.png'

In this case I'm using abspath() to normalize the path, which first
has Windows itself normalize the path via GetFullPathName(). This
shows what Windows will actually try to open or create, given that it
implements legacy DOS rules. For example, it ignores trailing spaces
and dots in the final path component:

>>> os.path.abspath('C:/test/missed.png ... ')
'C:\\test\\missed.png'

and DOS devices are virtually present in every directory:

>>> os.path.abspath('C:/test/nul.txt')
'.\\nul'
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Re: [Tutor] Hi all: How do I save a file in a designated folder?

[Cameron Simpson]

On 03May2017 00:01, Alan Gauld  wrote:

On 02/05/17 19:09, Michael C wrote:

1. How to name the file with time stamp.   e.g.   05012017.png and so forth.


And so forth? I assume you mean

MMDD.png format?

You should read about the strftime function in the time
(and datetime) module. Other functions thee will find
the current date/time for you. Thee are examples on the
documentation pages but if you get stuck come back
with specific questioons.


Further to this, I would also advocate that you consider writing the timestamp 
from largest unit to smallest unit, like an ISO8601 timestamp, which typically 
looks like:


 MMDD.png

See:
 https://www.iso.org/iso-8601-date-and-time-format.html
 https://en.wikipedia.org/wiki/ISO_8601

This has the advantage that a lexical sort (as in a typical directory listing 
or file glob) automatically arranges names in date order.


I'd also remark that the USA centric format (MMDD) that Alan inferred is 
particularly unfortunate in that (a) the rest of the world generally use 
DDMM so that the units come in increasing size and (b) doesn't sort very 
nicely at all. Of course, you might have meant 5th December 2017 above, so who 
knows? But the very ambiguity makes this one to avoid.


For numeric timestamps like yours I only ever use MMDD (or the obvious 
variants like -MM-DD etc). If I use another, I make the month a word (lousy 
for sorting and parsing, but clear to the human reader); I only do that in 
prose, not in filenames.


Cheers,
Cameron Simpson 
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Re: [Tutor] Hi all: How do I save a file in a designated folder?

[Alan Gauld via Tutor]

On 02/05/17 19:09, Michael C wrote:
> from PIL import Image
> from PIL import ImageGrab
> 
> screenshot = ImageGrab.grab()
> screenshot.show()
> screenshot.save("\test\missed.png")
> 
> This is my current code, using Python Image Library!

You should probably investigate Pillow, I believe
development of PIL has now ceased in favour of Pillow.
Pillow is backwardly compatible with PIL so your
existing code should still work.

> What I would like to get help with is:
> 
> 1. How to name the file with time stamp.   e.g.   05012017.png and so forth.

And so forth? I assume you mean

MMDD.png format?

You should read about the strftime function in the time
(and datetime) module. Other functions thee will find
the current date/time for you. Thee are examples on the
documentation pages but if you get stuck come back
with specific questioons.

> 2. How to save it in a designated folder like  C:\test\test2\ and so forth.

That is just string handling. thee is nothing special
about a file path(*), it is just a string. Store the folder as one
string then construct your file path with

filepath = folder + filename

(*)Having said that there is nothing special there is a
dedicated module for working with paths - os.path - that
has convenience functions for constructing and
de-constructing path strings. You might find it useful.

> P.S. I am on windows 10

The biggest issue with Windows is its use of \ as a separator.
Be sure to use raw strings ( ie prefix an r: r'') or just
use a Unix style [path with / instead of \. Or use os.path
which will intelligently decide which separator to use.

HTH
-- 
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] Hi all: How do I save a file in a designated folder?

[Michael C]

from PIL import Image
from PIL import ImageGrab

# takes the screenshot
screenshot = ImageGrab.grab()
# display the screenshot
screenshot.show()
# save the screenshot
screenshot.save("\test\missed.png")



This is my current code, using Python Image Library!

What I would like to get help with is:

1. How to name the file with time stamp.   e.g.   05012017.png and so forth.
2. How to save it in a designated folder like  C:\test\test2\ and so forth.

P.S. I am on windows 10


Thanks!
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