Dynamic text color

[Dave McCormick]

Hi All,

I am new to Python and the list so I hope  I am posting this correctly...

I am working on a way to have text automatically formated in a Tkiniter 
Text widget and would like some input on my code.
Currently I am using Python 2.5 because the server I use has that 
installed. Tkinter is tk8.4.


Most of the time when I type red, blue, or green the code works as 
expected.  When I copy paste text into the widget the last line is 
parsed with part of the previous lines

So I guess the problem is in the "looping"?

Here is my code:
from Tkinter import *
root = Tk()
def get_position(event):
   start = 1.0
   while 1:   
   pos = Tbox.search("red",END,backwards=TRUE)

   if not pos:
   break
   red = pos + "-1c"
   Tbox.tag_add("red", pos, float(pos)+.03)
   Tbox.tag_config("red", foreground="red")

   pos = Tbox.search("blue",END,backwards=TRUE)

   if not pos:
   break
   blue = pos + "-1c"
   Tbox.tag_add("blue", pos, float(pos)+.04)
   Tbox.tag_config("blue", foreground="blue")

   pos = Tbox.search("green",END,backwards=TRUE)
   if not pos:
   break
   green = pos + "-1c"
   Tbox.tag_add("green", pos, float(pos)+.05)
   Tbox.tag_config("green", foreground="green")
   break

Tbox = Text(root,width=40, height=15, wrap=CHAR)
Tbox.grid(column=0, row=0, sticky=(N+W+E+S))
root.grid_columnconfigure(0, weight=1)
root.grid_rowconfigure(0, weight=1)
Tbox.bind("", get_position)
Tbox.focus()
root.mainloop()

Thank you,
Dave
--
http://mail.python.org/mailman/listinfo/python-list

Re: Dynamic text color

[Dave McCormick]

John,

Thank you for the tips.
I was changing the line-column index to a FLOAT because the search would 
return the starting position (pos) of the string, then by making it a 
FLOAT and adding the string length I was able to get the end position.

If "red" was on line 1 column 0..
 Tbox.tag_add("red", pos, float(pos)+.03)
  =
 Tbox.tag_add("red", 1.0, 1.3)
It was all I could come up with.

You have convinced me about the re.finditer for this,  I think... 
Still in the prototyping mode:


  def get_position(event):
   pos = Tbox.get(1.0, END)
   match = [ matchobj.span() for matchobj in 
re.finditer("red", pos) ]

   print "match ",match  #debug to shell

Gives all of START,END pairs just fine. It is the last hint about 
line-column indexes that I am have problems with.  All of the 
documentation I can find about "text.tag_add()" uses line-column for 
coordinates.
If I count characters from the beginning how do I know what line the 
text is on? 


Would you mind making your last hint a bit stronger...

Thanks again!
Dave



John Posner wrote:
On Wed, 30 Dec 2009 12:58:06 -0500, Dave McCormick 
 wrote:



Hi All,

I am new to Python and the list so I hope  I am posting this 
correctly...


I am working on a way to have text automatically formated in a 
Tkiniter Text widget and would like some input on my code.
Currently I am using Python 2.5 because the server I use has that 
installed. Tkinter is tk8.4.


Most of the time when I type red, blue, or green the code works as 
expected.  When I copy paste text into the widget the last line is 
parsed with part of the previous lines

So I guess the problem is in the "looping"?

Here is my code:
from Tkinter import *
root = Tk()
def get_position(event):
start = 1.0


A couple of problems here: you define "start", but then never use it. 
Worse, it looks like you don't understand that a line-column index 
into a Tkinter Text widget is a STRING, not a FLOAT.




while 1:   pos = Tbox.search("red",END,backwards=TRUE)


I suggest that you use Tbox.get() instead of Tbox.search(), and then 
use Python's more powerful text-search tools. More on this below.




if not pos:
break
red = pos + "-1c"
Tbox.tag_add("red", pos, float(pos)+.03)
Tbox.tag_config("red", foreground="red")


You don't want to define the "red" tag every time get_position() is 
executed -- that is, every time the user presses a key. Define the 
red/green/blue tags just once, right after you create the Text widget.




 pos = Tbox.search("blue",END,backwards=TRUE)
if not pos:
break
blue = pos + "-1c"
Tbox.tag_add("blue", pos, float(pos)+.04)
Tbox.tag_config("blue", foreground="blue")

pos = Tbox.search("green",END,backwards=TRUE)
if not pos:
break
green = pos + "-1c"
Tbox.tag_add("green", pos, float(pos)+.05)
Tbox.tag_config("green", foreground="green")


The previous 6 lines are almost identical to the 6 lines that precede 
them. This is fine for prototyping, but when you find yourself writing 
code like this, think about using a loop or a parameterized function 
call. For example, you might write this function:


  def insert_color_markup(color):
  ...

... and then call it as many times as you need to:

  insert_color_markup("red")
  insert_color_markup("green")
  insert_color_markup("blue")

Now, about those text-search tools: the "re" (regular expression) 
module include the function "finditer". This is a real power tool, 
combining regular expressions and Python iterators -- both of which 
can be intimidating to newcomers. But it's just what you want, IMHO. I 
hope the following annotated IDLE transcript convinces you:


Python 2.6.4 (r264:75708, Oct 26 2009, 08:23:19) [MSC v.1500 32 bit 
(Intel)] on win32

import re



text = """The red ball is red, not green. On other other

... hand, the green ball has both red and blue highlights.
... Thank you.
... """


re.finditer("red", text)



... not too exciting, but this is better:


list(re.finditer("red", text))
[<_sre.SRE_Match object at 0x00C01F70>, <_sre.SRE_Match object at 
0x00C06E20>, <_sre.

SRE_Match object at 0x00C06E58>]

... this list indicates that we got three hits on the word "red"


[ matchobj.span() for matchobj in re.finditer("red", text) ]

[(4, 7), (16, 19), (77, 80)]

... paydirt: a list of (start,end) pairs for an invocation of 
Text.tag_add()


One more hint: forget about the line-column in

Re: Dynamic text color

[Dave McCormick]

Thanks John and Lie,

This is supposed to color the word "red" red, "blue" blue, "green" 
green, etc...
The idea is say for a database front end, the search words will be 
highlighted or colored when the query is returned.  Another thing I want 
to try is a Program editor, something like IDLE.
The program editor will be for Pic Basic Pro, (I mainly work with PIC 
CHIPS).  Yes there is a couple of good editors for PBP in Windows but 
not Linux.

Yup, I have a long ways to go.  Got to start some place :)

I was doing the grid because that is how the example I read dealing with 
scrollbars worked.  I stripped the scrollbar part out while working on 
the colors.  So I need to look at the pack() method more.


I will work on this more tonight and I will not look at your code before 
I get something working. 


Thanks again,
Dave



John Posner wrote:

On Thu, 31 Dec 2009 10:24:44 -0500, Dave McCormick 
wrote:


John,

Thank you for the tips.
I was changing the line-column index to a FLOAT because the search 
would return the starting position (pos) of the string, then by 
making it a FLOAT and adding the string length I was able to get the 
end position.

If "red" was on line 1 column 0..
  Tbox.tag_add("red", pos, float(pos)+.03)
   =
  Tbox.tag_add("red", 1.0, 1.3)
It was all I could come up with.


Yup, Dave, I've dug this kind of hole for myself many times!



You have convinced me about the re.finditer for this,  I think... 
Still in the prototyping mode:


   def get_position(event):
pos = Tbox.get(1.0, END)
match = [ matchobj.span() for matchobj in 
re.finditer("red", pos) ]

print "match ",match  #debug to shell


Notes:

* Variable "pos" should be "text" or "complete_text" or something 
similar.


* The first argument to the get() function must be a string:

  wrong ... complete_text = Tbox.get(1.0, END)
  right ... complete_text = Tbox.get("1.0", END)

But there's a more important problem. Is this function supposed to 
handle *one* word to be colored red, or *all the words* to be colored 
red? Here's what you want to do on each user keystroke:


1. Use get() to place the entire contents of the Text widget in a
variable, say "complete_text".

2. Use re.finditer() to generate START,END pairs for the 
substrings to
be colored red. You might find it easier to create a list from the 
iterator, though it isn't really necessary:


 start_end_pairs = list(re.finditer("red", complete_text))

3. Loop over the START,END pairs in this list. In each loop, use
tag_add() to tag one of the substrings.

[OOPS: I apologize if my suggestion in the previous post misled you. I 
described the output of finditer() as "a list of (start,end) pairs for 
an invocation of Text.tag_add()". I should have said "a list of 
(start,end) pairs, *WHICH CAN BE LOOPED OVER, FOR A SERIES OF 
INVOCATIONS* of Text.tag_add()".]


Note that the 3 steps above only handle the color red. So you want to 
place these steps in a function, then call the function for each color:


   insert_color_markup(text, "red")
   insert_color_markup(text, "green")
   insert_color_markup(text, "blue")

For each call, pass in the contents of complete_text as the first 
argument.


So the function-call hierarchy would be:

 get_position()<--- invoked on each keystroke
insert_color_markup()  <--- called once for each color
   get() then finditer() then loop-driven calls to tag_add()

I hope that makes sense to you!


Gives all of START,END pairs just fine. It is the last hint about 
line-column indexes that I am have problems with.  All of the 
documentation I can find about "text.tag_add()" uses line-column for 
coordinates.


Lie Ryan has already pointed you to clarifying documentation. Be sure 
to bookmark http://infohost.nmt.edu/tcc/help/pubs/tkinter/ in your Web 
browser!


If I count characters from the beginning how do I know what line the 
text is on? Would you mind making your last hint a bit stronger...


The point is that *you don't need to*. Handling the text as a simple 
sequence of characters is much simpler than worrying about line/column 
pairs. (If you were using a different shade of red on different lines, 
you *would* need to worry about line/column pairs.)


One more suggestion, which I forgot to make in the previous round. 
Your code includes this:


   Tbox.grid(column=0, row=0, sticky=(N+W+E+S))
   root.grid_columnconfigure(0, weight=1)
   root.grid_rowconfigure(0, weight=1)

You're working too hard here. This is sufficient:

   Tbox.pack()

Keep at it, Dave. I've posted a complete solution at 
http://cl1p.net/jjp_dynamic_text_color/. But I suggest that you put in 
a couple of more hours of coding before peeking at it.


Best,
John

--
http://mail.python.org/mailman/listinfo/python-list

Re: Dynamic text color

[Dave McCormick]

WooHoo!!!
I got it!!! Yup, I am sure it can be optimized but it works!!!
John,
I have to admit that I spent several hours working on this before I 
looked at your example, then I spent another several hours getting this far.

Would never have gotten it with out you help.  Thanks!!!

Also reading the thread "Significant whitespace" helped.  I had an 
indent problem in a FOR loop.
This is a whole lot different than the MCU programming I do in ASM or 
BASIC, starting to make sense though.


Thanks again for all the help and putting up with folks like me,
Dave

Here is what I can up with.
###
from Tkinter import *
import re

redList = "red dog".split()
blueList = "blue ball".split()
greenList = "green grass".split()
def get_position(event):
   complete = Tbox.get("1.0", END)
RED
   for word in redList:
   new_Rword(complete, word)  
def new_Rword(complete, word):

   Tbox.tag_remove(word, "1.0", END)
   for matchobj in re.finditer(word, complete):
   start,end =  matchobj.span()
   Tbox.tag_add("red", "1.0 + %d chars" % start,"1.0 + %d chars" % end)

   Tbox.tag_config("red", foreground="red")
BLUE###
   for word in blueList:
   new_Bword(complete, word)  
def new_Bword(complete, word):

   Tbox.tag_remove(word, "1.0", END)
   for matchobj in re.finditer(word, complete):
   start,end =  matchobj.span()
   Tbox.tag_add("blue", "1.0 + %d chars" % start,"1.0 + %d chars" % 
end)

   Tbox.tag_config("blue", foreground="blue")
GREEN###
   for word in greenList:
   new_Gword(complete, word)  
def new_Gword(complete, word):

   Tbox.tag_remove(word, "1.0", END)
   for matchobj in re.finditer(word, complete):
   start,end =  matchobj.span()
   Tbox.tag_add("green", "1.0 + %d chars" % start,"1.0 + %d chars" 
% end)
   Tbox.tag_config("green", foreground="green")  


root = Tk()
Tbox = Text(root, width=40, height=15, wrap=CHAR,
  font="Times 14 bold", bg="#dd")
Tbox.pack()
Tbox.bind("", get_position)
Tbox.focus()
root.mainloop()


John Posner wrote:

On Thu, 31 Dec 2009 10:24:44 -0500, Dave McCormick 
wrote:


John,

Thank you for the tips.
I was changing the line-column index to a FLOAT because the search 
would return the starting position (pos) of the string, then by 
making it a FLOAT and adding the string length I was able to get the 
end position.

If "red" was on line 1 column 0..
  Tbox.tag_add("red", pos, float(pos)+.03)
   =
  Tbox.tag_add("red", 1.0, 1.3)
It was all I could come up with.


Yup, Dave, I've dug this kind of hole for myself many times!



You have convinced me about the re.finditer for this,  I think... 
Still in the prototyping mode:


   def get_position(event):
pos = Tbox.get(1.0, END)
match = [ matchobj.span() for matchobj in 
re.finditer("red", pos) ]

print "match ",match  #debug to shell


Notes:

* Variable "pos" should be "text" or "complete_text" or something 
similar.


* The first argument to the get() function must be a string:

  wrong ... complete_text = Tbox.get(1.0, END)
  right ... complete_text = Tbox.get("1.0", END)

But there's a more important problem. Is this function supposed to 
handle *one* word to be colored red, or *all the words* to be colored 
red? Here's what you want to do on each user keystroke:


1. Use get() to place the entire contents of the Text widget in a
variable, say "complete_text".

2. Use re.finditer() to generate START,END pairs for the 
substrings to
be colored red. You might find it easier to create a list from the 
iterator, though it isn't really necessary:


 start_end_pairs = list(re.finditer("red", complete_text))

3. Loop over the START,END pairs in this list. In each loop, use
tag_add() to tag one of the substrings.

[OOPS: I apologize if my suggestion in the previous post misled you. I 
described the output of finditer() as "a list of (start,end) pairs for 
an invocation of Text.tag_add()". I should have said "a list of 
(start,end) pairs, *WHICH CAN BE LOOPED OVER, FOR A SERIES OF 
INVOCATIONS* of Text.tag_add()".]


Note that the 3 steps above only handle the color red. So you want to 
place these steps in a function, then call the function for each color:


   insert_color_markup(text, "red")
   insert_color_markup(text, "green")
   insert_color_markup(text, "blue")

For each call, pass in the contents of complete_text as the first 
argument.


So the function-call hierarchy would be:

 get_positi

Re: Dynamic text color

[Dave McCormick]

John,
Interesting and confusing...
I tested my code on Ubuntu 8.04, Win XP and 7, and WinMob before I 
called it "good".  And of course your modifications work on all too.


"""
* rename get_position() to get_complete_text()
* replace new_Rword(), new_Bword(), and new_Gword() with a single 
function that has an extra parameter, "color".

"""
The first easy, the second is going to take some thinking
Keep at it I will.  I am hooked!!!  Being able to write once and run on 
all of the above platforms is amazing!!!


Thanks again!!!
Dave

John Posner wrote:

On Sat, Jan 2, 2010 at 1:47 PM, Dave McCormick wrote:


WooHoo!!!
I got it!!! Yup, I am sure it can be optimized but it works!!!


Dave, please ignore a couple of my bogus complaints in the previous 
message:


   ... you call function new_Rword() before you define it

   ... this version also has the advantage of defining each function 
just once, instead of multiple times on each keystroke



But I stand by my overall statement that the program didn't work for 
me, and that rearranging the lines produces a working program.


-John

--
http://mail.python.org/mailman/listinfo/python-list

Re: Dynamic text color

[Dave McCormick]

John Posner wrote:
On Fri, 01 Jan 2010 21:01:04 -0500, Cousin Stanley 
 wrote:





I was not familiar with the re.finditer method
for searching strings ...


Stanley and Dave --

So far, we've just been using finditer() to perform standard-string 
searches (e.g. on the word "red"). Since Dave now wants to color 
multiple words the same color (e.g. the words in redList), we can use 
a single regular-expression search to locate *all* the words in a 
list. This eliminates the need to use a "for" loop to handle the list. 
Here's what I mean:


 >>> import re
 >>> s = "it is neither red nor crimson, but scarlet, you see"

## individual searches

 >>> [matchobj.span() for matchobj in re.finditer("red", s)]
 [(14, 17)]
 >>> [matchobj.span() for matchobj in re.finditer("crimson", s)]
 [(22, 29)]
 >>> [matchobj.span() for matchobj in re.finditer("scarlet", s)]
 [(35, 42)]

## one "swell foop"

 >>> redList = "red crimson scarlet".split()
 >>> redList_regexp = "|".join(redList)
 >>> redList_regexp
 'red|crimson|scarlet'
 >>> [matchobj.span() for matchobj in re.finditer(redList_regexp, s)]
 [(14, 17), (22, 29), (35, 42)]

-John

Thanks again John,
This is fun!!!
I made a "red.text" file to hold the "red words", they are separated by 
a space in the file.
Still need to add the extra parameter "color" someplace. But this is 
what I have so far.

##
file = 'red.txt'
file = open("red.txt","r")
rList = file.readlines()
file.close()
redList = str(rList).split()
blueList = "blue ball".split()
greenList = "green grass".split()
def get_complete_text(event):
   complete_text = Tbox.get("1.0", END)
   Tbox.tag_remove("red", "1.0", END)
   Tbox.tag_remove("blue", "1.0", END)
   Tbox.tag_remove("green", "1.0", END)
RED
   redList_regexp = "|".join(redList)
   for matchobj in re.finditer(redList_regexp, complete_text):
   start,end = matchobj.span()
   Tbox.tag_add("red", "1.0 + %d chars" % start,"1.0 + %d chars" % end)
   Tbox.tag_config("red", foreground="red")
BLUE###
   blueList_regexp = "|".join(blueList)
   for matchobj in re.finditer(blueList_regexp, complete_text):
   start,end = matchobj.span()
   Tbox.tag_add("blue", "1.0 + %d chars" % start,"1.0 + %d chars" % 
end)

   Tbox.tag_config("blue", foreground="blue")
GREEN###
   greenList_regexp = "|".join(greenList)
   for matchobj in re.finditer(greenList_regexp, complete_text):
   start,end = matchobj.span()
   Tbox.tag_add("green", "1.0 + %d chars" % start,"1.0 + %d chars" 
% end)

   Tbox.tag_config("green", foreground="green")
--
http://mail.python.org/mailman/listinfo/python-list

Re: Fwd: I would like to install Python on my 64 bit Win 7

[Dave McCormick]

aung paing Soe wrote:

  
  -- Forwarded message --
From: aung paing Soe 
Date: Tue, Jan 5, 2010 at 11:27 AM
Subject: I would like to install Python on my 64 bit Win 7
To: webmas...@python.org
  
  
Hello , 
  I would like to study about Python Programming . So I want to
install Python .
But my laptop is Window 7 64-bit home basic  . 
So please give me a advice how to install Python in my 64 bit computer.
I really want to study python programming .
I am looking forward your reply.
Thank you very much
  
Yours, 
Beginner 
  

I am using WIN7 64 bit also.  
Go to python.org and look for 
http://www.python.org/download/releases/2.5.4/
python-2.5.4.amd64.msi

Dave


-- 
http://mail.python.org/mailman/listinfo/python-list

Re: Dynamic text color

[Dave McCormick]

John Posner wrote:


Dave, you're doing exactly the right thing: gradually expanding your 
program, to provide more functionality and to learn more about the 
available programming tools. It's also very good that you take care to 
close() the file after processing it. Now for the bad news ...

Seems like there is always bad news :)


1. Don't use "file" as a variable name -- it's a built-in object type. 
(Some people don't like the fact that Python allows you to redefine 
such "reserved words".)


2. It's probably not the best idea to use a single variable (you use 
"file") to do double-duty: to hold the name of a file, and to hold the 
open-file object returned by the open() function. It's perfectly 
legal, but it hides information that might be useful when you're 
debugging a program. This is better:


3. It might be better to use read() rather than readlines() to process 
the "red.txt" file. It depends on what that file is supposed to 
contain. For example, if you expect "red.txt" to contain exactly one 
line, which has one or more words, you can process the open-file 
object like this:

All noted and fixed.


It's certainly a mistake to use the expression "str(rList).split()". 
Using str() to convert the list "rList" into a string creates a mess 
that includes square-bracket characters. Did this actually work for you?
It sort of worked.  With one color file it seemed fine but after I 
posted I added another color file and things fell apart.
Now with the above fixes it works with three colors from three files.  
When the list are printed to the shell the list look like this:

redList ['red', 'dog', 'apple', '#']
blueList ['blue', 'ball', 'berry']
greenList ['green', 'grass', 'do']

But another problem is noticed.  It does not matter if the list is built 
in code or from a file.
If dog is entered, "do" will be green with the "g" being red.  
Back to the drawing board.


Here is the complete code"
##
from Tkinter import *
import re
RFfile = 'red.txt'
inpRF = open(RFfile,"r")
rList = inpRF.read()
inpRF.close()

BFfile = 'blue.txt'
inpBF = open(BFfile,"r")
bList = inpBF.read()
inpBF.close()

GFfile = 'green.txt'
inpGF = open(GFfile,"r")
gList = inpGF.read()
inpGF.close()

def get_complete_text(event):
   complete_text = Tbox.get("1.0", END)
   redList = str(rList).split()
   blueList = str(bList).split()
   greenList = str(gList).split()
   print "redList",redList
   print "blueList",blueList
   print "greenList",greenList
   Tbox.tag_remove("red", "1.0", END)
   Tbox.tag_remove("blue", "1.0", END)
   Tbox.tag_remove("green", "1.0", END)
RED
   redList_regexp = "|".join(redList)
   for matchobj in re.finditer(redList_regexp, complete_text):
   start,end = matchobj.span()
   Tbox.tag_add("red", "1.0 + %d chars" % start,"1.0 + %d chars" % end)
   Tbox.tag_config("red", foreground="red")
BLUE###
   blueList_regexp = "|".join(blueList)
   for matchobj in re.finditer(blueList_regexp, complete_text):
   start,end = matchobj.span()
   Tbox.tag_add("blue", "1.0 + %d chars" % start,"1.0 + %d chars" % 
end)

   Tbox.tag_config("blue", foreground="blue")
GREEN###
   greenList_regexp = "|".join(greenList)
   for matchobj in re.finditer(greenList_regexp, complete_text):
   start,end = matchobj.span()
   Tbox.tag_add("green", "1.0 + %d chars" % start,"1.0 + %d chars" 
% end)

   Tbox.tag_config("green", foreground="green")

root = Tk()
Tbox = Text(root, width=40, height=15, wrap=CHAR,
  font="Times 14 bold", bg="#dd")
Tbox.pack()
Tbox.bind("", get_complete_text)
Tbox.focus()
root.mainloop()

Thanks again,
Dave
--
http://mail.python.org/mailman/listinfo/python-list

Re: Dynamic text color

[Dave McCormick]

John Posner wrote:
On Tue, 05 Jan 2010 15:08:04 -0500, Dave McCormick 
 wrote:


It sounds like the program is doing exactly what you TOLD it to do 
(which might not be what you WANT it to do):


 1. In an earlier pass on the text, color the string "dog" red.
 2. In a later pass, color the string "do" green.

You need to decide what you WANT to happen if one word to be colored 
is a substring of another word to be colored differently. Or maybe you 
want to outlaw such situations. After making that decision, you can 
start to think about how to write the appropriate code.


Best,
John
Darn thing doing what I told it to do...  Guess that means I did 
something right :)
But it is not what I am wanting. 
I first thought to make it look for a space but that would not work when 
a single character like "#" is to be colored if there is a "string" of 
them.  Or if all of the characters between quotes are to be colored. 


I always did like puzzles!

Dave
--
http://mail.python.org/mailman/listinfo/python-list

Re: Exception as the primary error handling mechanism?

[Dave McCormick]

Lie Ryan wrote:
That's a sign of a gotcha... a well-designed language makes you think 
about your problem at hand and less about the language's syntax.

Not until you learn the language that is.
From a Python newbee ;-)

--
http://mail.python.org/mailman/listinfo/python-list

Re: Dynamic text color

[Dave McCormick]

On Wed, Jan 6, 2010 at 9:18 AM, John Posner  wrote:

> On Tue, 05 Jan 2010 16:54:44 -0500, Dave McCormick 
> wrote:
>
>  But it is not what I am wanting. I first thought to make it look for a
>> space but that would not work when a single character like "#" is to be
>> colored if there is a "string" of them.  Or if all of the characters between
>> quotes are to be colored.
>>
>
> Regular expressions are good at handling searches like:
>
> * all the characters between quotes
> * the two-character string "do", but only if it's a complete word
>
> -John
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
I need another hint...

Been doing some reading and playing and it looks like
r'\bxxx\b'
is what I need. But I can not figure out how to pass a variable between
\b___\b
If the word in question is between the "\b \b" and in the list then it works
like I want it to.
 The below does not work.

greenList_regexp = "|".join(greenList)
for matchobj in re.finditer(r'\bgreenList_regexp\b', complete_text):
start,end = matchobj.span()

Thanks,
Dave
-- 
http://mail.python.org/mailman/listinfo/python-list

Re: Dynamic text color

[Dave McCormick]

On Fri, Jan 8, 2010 at 12:28 PM, MRAB  wrote:

> Dave McCormick wrote:
>
>>
>>
>> On Wed, Jan 6, 2010 at 9:18 AM, John Posner > jjpos...@optimum.net>> wrote:
>>
>>On Tue, 05 Jan 2010 16:54:44 -0500, Dave McCormick
>>mailto:mackrac...@gmail.com>> wrote:
>>
>>But it is not what I am wanting. I first thought to make it look
>>for a space but that would not work when a single character like
>>"#" is to be colored if there is a "string" of them.  Or if all
>>of the characters between quotes are to be colored.
>>
>>
>>Regular expressions are good at handling searches like:
>>
>>* all the characters between quotes
>>* the two-character string "do", but only if it's a complete word
>>
>>-John
>>
>>--http://mail.python.org/mailman/listinfo/python-list
>>
>> I need another hint...
>>
>> Been doing some reading and playing and it looks like
>> r'\bxxx\b'
>> is what I need. But I can not figure out how to pass a variable between
>> \b___\b
>> If the word in question is between the "\b \b" and in the list then it
>> works like I want it to.
>>  The below does not work.
>>
>>greenList_regexp = "|".join(greenList)
>>for matchobj in re.finditer(r'\bgreenList_regexp\b', complete_text):
>>start,end = matchobj.span()
>>
>>  The regex r'\bgreenList_regexp\b' will match the string
> 'greenList_regexp' if it's a whole word.
>
> What you mean is "any of these words, provided that they're whole
> words". You'll need to group the alternatives within "(?:...)", like
> this:
>
>r'\b(?:' + greenList_regexp + ')\b'
>
>
>  Thanks but that did not work either.
Maybe I have something else wrong too?

complete_text = Tbox.get("1.0", END)
greenList = "green grass".split()
greenList_regexp = "|".join(greenList)
for matchobj in re.finditer(r'\b(?:' + greenList_regexp + ')\b',
complete_text):
start,end = matchobj.span()
Tbox.tag_add("green", "1.0 + %d chars" % start,"1.0 + %d chars" %
end)
Tbox.tag_config("green", foreground="green")

The words "green" and "grass" do not turn green.

Dave
-- 
http://mail.python.org/mailman/listinfo/python-list

Re: Dynamic text color

[Dave McCormick]

John Posner wrote:
On Fri, 08 Jan 2010 14:28:57 -0500, MRAB  
wrote:



The regex r'\bgreenList_regexp\b' will match the string
'greenList_regexp' if it's a whole word.

What you mean is "any of these words, provided that they're whole
words". You'll need to group the alternatives within "(?:...)", like
this:

 r'\b(?:' + greenList_regexp + ')\b'


Oops, MRAB, you forgot to make the last literal a RAW string -- it 
should be r')\b'


Dave, we're already into some pretty heavy regular-expression work, 
huh?. Here's another approach -- not nearly as elegant as MRAB's:


Given this list:

  greenList = ['green', 'grass', 'grump']

... you currently are using join() to construct this regexp search 
string:


  'green|grass|grump'

... but you've decided that you really want this similar regexp search 
string:


  r'\bgreen\b|\bgrass\b|\bgrump\b'

You can achieve this by transforming each item on the list, then 
invoking join() on the transformed list to create the search string. 
Here are a couple of ways to transform the list:


* List comprehension:

  whole_word_greenList = [ r'\b' + word + r'\b' for word in greenList]

* map() and a user-defined function:

  def xform_to_wholeword_searchstring(word):
  return r'\b' + word + r'\b'

  whole_word_greenList = map(xform_to_wholeword_searchstring, greenList)


HTH,
John

John,
That second "r" appears to do the trick.

Yea, pretty heavy into it.  I read someplace that regular-expressions 
were tricky,  but I did not expect this :)


Now to start working this into the rest of my app and study your second 
approach.


Thanks again for the help!!!
Dave
--
http://mail.python.org/mailman/listinfo/python-list