Re: [Tutor] Learning Regular Expressions

[Terry--gmail]

Thanks Alan

I noticed that I was using some double ' to encircle some things and 
some single ' for apostrophes in contractionsand fixed those...but 
apparently since you could run it, that part didn't matter. The problem 
was ultimately caused by a stray ''' which was a fragment of me messing 
with things trying to fix them and it slipped down my screen and was 
hidden from me when I would look at the script!


Thanks for double checking me. :)


On 05/30/2016 03:07 PM, Alan Gauld via Tutor wrote:

On 30/05/16 18:21, dirkjso...@gmail.com wrote:


I moved my notes that contained any '\'s to a different python file.
However, if we run it, we get the error I was having. Here's the
script:

Runs fine for me.

Can you run it using the python command line interpreter rather
than IDLE? Do you still get errors? If so cut n paste the full
error to the list.




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Re: [Tutor] Learning Regular Expressions

[dirkjso...@gmail.com]

Thanks Bob,





OK. The escape character \ still is active in escaping the next 
character or space when inside of triple quotes. So, I guess when the 
program is running, since I am not printing these things out, I don't 
care if anything in my notes is escaped unless it is a strategic single 
or double quotethus disrupting the bubble of the comment formed by 
such triple quotes.


Speaking of single and double quotes, I noticed that I had used two 
single ' to surround some things, so I changed them to double quotes so 
as not to confuse my triple quotes. Then I noticed that I had also used 
contractions with ' apostrophes which would also mess up my comment 
bubble, so I got rid of those also. As far as I can tell, the triple 
single quotes (''') should work at that point. In fact, they do if I 
wrap this whole section in a print( ) statement and paste it into IDLE 
SHELL. But! I found as soon as I had IDLE run my script I got the same 
error.


Here is where I am at now with this script:   (NOTE:  I have the final 
solution below this listing.)


#!/usr/bin/env python3

'''
Regular Expressions - or at least some

Identifiers:

\d  any number
\D  anything but a number (digit)
\s  space
\S  anything but a space
\w  any character
\W  anything but a character
\.   any character (or even a period itself if you use \.) except for a 
newline

\a   search for just the letter "a"
\b  the white space around words

Modifiers
{x}we are expecting "x" number of something
{1, 3}  we are expecting 1-3 in length of something -, so for digits we 
write  \d{1-3}

+  means Match 1 or more
?  means Match 0 or 1
*   Match 0 or more
$  Match the end of a string
^  Match the beginning of a string
|   Match either or   - so you might write  \d{1-3} | \w{5-6}
[ ]  a range or "variance" such as [A-Z] or [A-Za-z] Cap 1st letter 
followed by lower case
or [1-5a-qA-Z] starts with a number inclusive of 1-5 then 
lower case letter then

followed by any Cap letter! :)

White Space Characters  (may not be seen):
\n  new line
\s  space
\t   tab
\e  escape
\f  form feed
\r  return

DO NOT FORGET!:
.  +  *  ?  [  ]  $  ^  (  )  {  }  |  \if you really want to use 
these, you must escape them


'''

I was not getting a line number for the error because I was running it 
only from IDLE and I was looking only at the commented area...as that 
now was the only thing left in the scriptor was it? It hadn't 
occurred to me to try the linux command line.  When I called it from the 
Linux Console, I got:


[justme@ispy] ~/python_work$ python3 RE-1.py
  File "RE-1.py", line 69

^
SyntaxError: EOF while scanning triple-quoted string literal
[justme@ispy] ~/python_work$

Which puzzled me, as I didn't have 69 lines!  And guess what I found 
when I scrolled down past the end of my script? Way down out of sight 
below my program was  a single  ''' setting down there all by it's 
lonesome self!  -a fragment of me changing things all over the place 
trying to figure out what was going wrongit had slipped below my 
line of sight and with further chances continued to work it's way down 
the page.


I think all these fixes...this solves my problem!  Thanks for your time 
and help!  :)


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Re: [Tutor] Learning Regular Expressions

[Alan Gauld via Tutor]

On 30/05/16 18:21, dirkjso...@gmail.com wrote:

> I moved my notes that contained any '\'s to a different python file.
> However, if we run it, we get the error I was having. Here's the
> script:

Runs fine for me.

Can you run it using the python command line interpreter rather
than IDLE? Do you still get errors? If so cut n paste the full
error to the list.


-- 
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] Learning Regular Expressions

[boB Stepp]

On Mon, May 30, 2016 at 12:13 PM, dirkjso...@gmail.com
 wrote:
> Hi bob,
>
> I had used the wrong email address when I wrote to python tutor on this, and
> evidently it
> took a while for the monitors to let it go ahead and be entered in the list,
> so I apologize
> for the delay in my reply.

That's okay.  Note that Tutor is a collaborative learning environment,
so that normally you should send your responses to the whole list, not
just me.  That way we can all learn from what is written.  So I am
sending this to the Tutor list, but not everything as I notice you
sent another response with pretty much everything to Alan and Tutor.

> I continued to mess with it, and it seems or appears that escape '\' was
> being noticed by
> the interpreter despite the fact it is in a triple quoted area!
>
> As for the traceback, (I am not sure what you mean by 'FULL TRACEBACK'),
> there was no
> highlighted point in the program. I simply got the message I printed here.

I am back at home now with access to Python 3.  What I meant was, if I
have this Python file, test_traceback.py:

#!/usr/bin/env python3

print('''I will deliberately use a backslash inside this triple-quote.\''')

When I run this code from the command line, I get:

Microsoft Windows [Version 6.1.7601]
Copyright (c) 2009 Microsoft Corporation.  All rights reserved.

C:\Windows\system32>e:

E:\>cd /py_projects

E:\py_projects>py test_traceback.py
  File "test_traceback.py", line 5

^
SyntaxError: EOF while scanning triple-quoted string literal

This is what I mean by a full traceback.  Notice it tells me what line
of my code file where it first encountered a problem.  Just so you
have it in mind, with things involving quotes issues, the actual point
of error might be several lines earlier.  But in this case I kept
things simple to illustrate the point.

Now if you ran my one-line program in the Python interpreter, you
would get a different kind of problem:

Python 3.5.1 (v3.5.1:37a07cee5969, Dec  6 2015, 01:54:25) [MSC v.1900
64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
py3: print('''I will deliberately use a backslash inside this triple-quote.\''')
...
...
...
...
...

Notice that every time I hit return in the interpreter, trying to
*run* the code, it would not do so.  Instead, every time I press
 I get three dots.  This is because in my actual code it sees
the second triple-quote as being two single-quotes and a parenthesis.
It does not see the triple-quote as yet being completed, and,
additionally, it does not see the print function as being closed.  So
if I do these completions, I get:

py3: print('''I will deliberately use a backslash inside this triple-quote.\''')
...
...
...
...
... '
...
...
... '''
... )
I will deliberately use a backslash inside this triple-quote.''')




'



py3:

Notice the extra single-quote I threw in.  I hope it shows in more
detail what is going on.

HTH!

boB
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Re: [Tutor] Learning Regular Expressions

[dirkjso...@gmail.com]

On 05/24/2016 01:48 PM, Alan Gauld via Tutor wrote:

On 23/05/16 23:08, Terry--gmail wrote:


scripted worked great without the notes!  I'd like to know what it is in
the below Tripple-Quoted section that is causing me this problem...if
anyone recognizes. In IDLE's script file..._it's all colored green_,
which I thought meant Python was going to ignore everything between the
tripple-quotes!

Its all green forv me too and it runs perfectly - as in it does
absolutly nothing.


And if I add print('hello world') at the end it prionts ok too.

I even tried assigning your docsstring to a variable and printing
that and it too worked.

Linux Mint 17
Python 3.4.3
IDLE 3

So I don't think this is your entire problem. Maybe you should
show us some code that actually causes the error?


But if I run just the below portion of the script in
it's own file, I get the same While Scanning Tripple-Quotes error.

As above, it runs silently for me.


Hi Alan,

I moved my notes that contained any '\'s to a different python file.
However, if we run it, we get the error I was having. Here's the
script:

#!/usr/bin/env python3

'''
Regular Expressions - or at least some

Identifiers:

\d  any number
\D  anything but a number (digit)
\s  space
\S  anything but a space
\w  any character
\W  anything but a character
.   any character (or even a period itself if you use \.) except for a 
newline

a   search for just the letter 'a'
\b  the white space around words

Modifiers
{x}we are expecting "x" number of something
{1, 3}  we're expecting 1-3 in length of something -, so for digits we 
write  \d{1-3}

+  means Match 1 or more
?  means Match 0 or 1
*   Match 0 or more
$  Match the end of a string
^  Match the beginning of a string
|   Match either or   - so you might write  \d{1-3} | \w{5-6}
[ ]  a range or "variance" such as [A-Z] or [A-Za-z] Cap 1st letter 
followed by lower case
or [1-5a-qA-Z] starts with a number inclusive of 1-5 then 
lower case letter then

followed by any Cap letter! :)

White Space Characters  (may not be seen):
\n  new line
\s  space
\t   tab
\e  escape
\f  form feed
\r  return

DON'T FORGET!:
.  +  *  ?  [  ]  $  ^  (  )  {  }  |  \   if you really want to use 
these, you must escape them '\'


'''


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Re: [Tutor] Learning Regular Expressions

[Alan Gauld via Tutor]

On 23/05/16 23:08, Terry--gmail wrote:

> scripted worked great without the notes!  I'd like to know what it is in 
> the below Tripple-Quoted section that is causing me this problem...if 
> anyone recognizes. In IDLE's script file..._it's all colored green_, 
> which I thought meant Python was going to ignore everything between the 
> tripple-quotes! 

Its all green forv me too and it runs perfectly - as in it does
absolutly nothing.


And if I add print('hello world') at the end it prionts ok too.

I even tried assigning your docsstring to a variable and printing
that and it too worked.

Linux Mint 17
Python 3.4.3
IDLE 3

So I don't think this is your entire problem. Maybe you should
show us some code that actually causes the error?

> But if I run just the below portion of the script in 
> it's own file, I get the same While Scanning Tripple-Quotes error.

As above, it runs silently for me.

-- 
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] Learning Regular Expressions

[boB Stepp]

On Mon, May 23, 2016 at 5:08 PM, Terry--gmail  wrote:
> Running Linux Mint
> The YouTube Sentdex Video tutor I am following.
> He is working in Python3.4 and I am running Python3.4.3
>
> He's demonstrating some Regular Expressions which I wanted to test out. On
> these test scripts, for future referrence, I have been putting my notes in
> Tripple Quotes and naming the scripts descriptively to be able to find them
> again, when I need to review. However, this time, when  I copied in a simple
> script below my RE notes, and ran it from IDLE (and from Console) I got the
> following error:
>
> SyntaxError:  EOF while scanning triple-quoted string literal
>
> Now, there was also a tripple-quoted string I had set a variable to in my
> script...so I thought it was the active part of the script! But eventually,
> through the process of elimination, I discovered the scripted worked great
> without the notes!  I'd like to know what it is in the below Tripple-Quoted
> section that is causing me this problem...if anyone recognizes. In IDLE's
> script file..._it's all colored green_, which I thought meant Python was
> going to ignore everything between the tripple-quotes! But if I run just the
> below portion of the script in it's own file, I get the same While Scanning
> Tripple-Quotes error.

I do not know the exact point of error in your code, but even if you
use triple-quoted strings, escape sequences still work.  I do not have
a Python 3 installation handy, but in the Python 2.7.8 that I do have
handy:

Python 2.7.8 (default, Jun 30 2014, 16:03:49) [MSC v.1500 32 bit
(Intel)] on win32
Type "copyright", "credits" or "license()" for more information.
>>> print '''
\tTab character!!!
'''

Tab character!!!

>>>

Note:  I had to simulate with spaces what I see in IDLE as my Gmail
refuses to accurately copy my IDLE result.

I suspect that your multiple backslash instances are generating what
you are observing.  Doesn't your full traceback target the exact line
of your code on which this occurs?

HTH,
boB
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[Tutor] Learning Regular Expressions

[Terry--gmail]

Running Linux Mint
The YouTube Sentdex Video tutor I am following.
He is working in Python3.4 and I am running Python3.4.3

He's demonstrating some Regular Expressions which I wanted to test out. 
On these test scripts, for future referrence, I have been putting my 
notes in Tripple Quotes and naming the scripts descriptively to be able 
to find them again, when I need to review. However, this time, when  I 
copied in a simple script below my RE notes, and ran it from IDLE (and 
from Console) I got the following error:


SyntaxError:  EOF while scanning triple-quoted string literal

Now, there was also a tripple-quoted string I had set a variable to in 
my script...so I thought it was the active part of the script! But 
eventually, through the process of elimination, I discovered the 
scripted worked great without the notes!  I'd like to know what it is in 
the below Tripple-Quoted section that is causing me this problem...if 
anyone recognizes. In IDLE's script file..._it's all colored green_, 
which I thought meant Python was going to ignore everything between the 
tripple-quotes! But if I run just the below portion of the script in 
it's own file, I get the same While Scanning Tripple-Quotes error.


#!/usr/bin/env python3

'''
Regular Expressions - or at least some

Identifiers:

\d  any number
\D  anything but a number (digit)
\s  space
\S  anything but a space
\w  any character
\W  anything but a character
.   any character (or even a period itself if you use \.) except for a 
newline

a   search for just the letter 'a'
\b  the white space around words

Modifiers
{x}we are expecting "x" number of something
{1, 3}  we're expecting 1-3 in length of something -, so for digits we 
write  \d{1-3}

+  means Match 1 or more
?  means Match 0 or 1
*   Match 0 or more
$  Match the end of a string
^  Match the beginning of a string
|   Match either or   - so you might write  \d{1-3} | \w{5-6}
[ ]  a range or "variance" such as [A-Z] or [A-Za-z] Cap 1st letter 
followed by lower case
or [1-5a-qA-Z] starts with a number inclusive of 1-5 then 
lower case letter then

followed by any Cap letter! :)

White Space Characters  (may not be seen):
\n  new line
\s  space
\t   tab
\e  escape
\f  form feed
\r  return

DON'T FORGET!:
.  +  *  ?  [  ]  $  ^  (  )  {  }  |  \   if you really want to use 
these, you must escape them '\'


'''

Thanks for your thoughts!
--Terry
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