[Tutor] name error

[Dave Angel]

ugajin at talktalk.net Wrote in message:
> I am running nodebox 1 on OSX v10.6.8, which is an open source OSX 
> Python, 2D data visualiser, and although not legacy, the software it 
> isn't well supported. (see http://nodebox.net/code/index.php/Home for 
> further info).  I believe nodebox 1, runs with Python 2.5 
>  
> This may be too specialised a question for the tutor forum, but . . .  
> I have posted several e-mails to the nodebox author the first of which 
> was almost 3 weeks ago, and although I received an initial  positive 
> response, saying he would provide a screen cast to help,  the said 
> screencast has not arrived. After, I sent a polite reminder, I received 
> a curt if incomplete reply telling me he was now on holiday. 
>  
> Sometimes it can help, to describe a problem to a 3rd person (real or 
> imagined), so here goes (it may have helped a bit, but not enough). 
>  
> To draw a default rectangle using the nodebox 1, IDE you would simply 
> write: rect(0, 0, 100, 100) to a .py file.  When run in nodebox 1, IDE 
> it does what you might expect. It renders a 100 x 100 (px) rectangle 
> shape, with the top left vertex at the canvas x, y coordinate 0, 0 
>  

Not being familiar with nodebox, I'm mostly guessing.  I presume
 that nodebox comes with an Integrated Development Environment
 (IDE) and that the environment is doing some import,  perhaps the
 dreaded 'from xxxxx import *x' where xxxxx is maybe 'nodebox.
 

Anyway,  whatever they're doing for your interactive environment
 is just confusing you for writing scripts and modules, where your
 imports must be explicit. 

> However, when I try to call the .py file as a module (using the nodebox 
> IDE) which is what I am trying to acheive, I get a traceback error 
> message e.g. 
> # import_test_1.py 
> rect(0, 0, 100, 100) 
>  
> #importer_test_1.py 
> import_test_1 
> Traceback (most recent call last): 
>  File "nodebox/gui/mac/__init__.pyo", line 358, in _execScript 
>   File "/Users/apple/Documents/nodeBox/07_10_2014/importer_2.py", line 
> 2, in <module> 
>   File "/Users/apple/Documents/nodeBox/07_10_2014/import_test_2.py", 
> line 22, in <module> 
> NameError: name 'rect' is not defined 
>  
> This begins to look like a scope issue. 

Sure you probably need
import nodebox
nodebox.rect (.....


>  
> However, when I execute/run the following command, I get the following 
> output 
> # import_test_2.py 
> print 'dir:', dir() 
>  
> dir: ['BOOLEAN', 'BUTTON', 'BezierPath', 'CENTER', 'CLOSE', 'CMYK', 
> 'CORNER', 'CURVETO', 'Canvas', 'ClippingPath', 'Color', 'Context', 
> 'DEFAULT_HEIGHT', 'DEFAULT_WIDTH', 'FORTYFIVE', 'FRAME', 'Grob', 
> 'HEIGHT', 'HSB', 'Image', 'JUSTIFY', 'KEY_BACKSPACE', 'KEY_DOWN', 
> 'KEY_LEFT', 'KEY_RIGHT', 'KEY_UP', 'LEFT', 'LINETO', 'MOUSEX', 
> 'MOUSEY', 'MOVETO', 'NORMAL', 'NUMBER', 'NodeBoxError', 'Oval', 
> 'PAGENUM', 'PathElement', 'Point', 'RGB', 'RIGHT', 'Rect', 'TEXT', 
> 'Text', 'Transform', 'Variable', 'WIDTH', '__builtins__', '__class__', 
> '__delattr__', '__dict__', '__doc__', '__getattribute__', '__hash__', 
> '__init__', '__magic_var__', '__module__', '__new__', '__reduce__', 
> '__reduce_ex__', '__repr__', '__setattr__', '__str__', '__weakref__', 
> '_align', '_arrow', '_arrow45', '_autoclosepath', '_colormode', 
> '_colorrange', '_copy_attr', '_copy_attrs', '_ctx', '_fillcolor', 
> '_fontname', '_fontsize', '_get_height', '_get_width', '_imagecache', 
> '_lineheight', '_makeInstance', '_noImagesHint', '_ns', '_oldvars', 
> '_outputmode', '_path', '_resetContext', '_strokecolor', 
> '_strokewidth', '_transform', '_transformmode', '_transformstack', 
> '_vars', 'addvar', 'align', 'arrow', 'autoclosepath', 'autotext', 
> 'background', 'beginclip', 'beginpath', 'canvas', 'choice', 
> 'closepath', 'cm', 'color', 'colormode', 'colorrange', 'curveto', 
> 'drawpath', 'endclip', 'endpath', 'files', 'fill', 'findpath', 
> 'findvar', 'font', 'fontsize', 'grid', 'image', 'imagesize', 'inch', 
> 'key', 'keycode', 'keydown', 'line', 'lineheight', 'lineto', 'mm', 
> 'mousedown', 'moveto', 'nofill', 'nostroke', 'outputmode', 'oval', 
> 'pop', 'push', 'random', 'rect', 'reset', 'rotate', 'save', 'scale', 
> 'scrollwheel', 'size', 'skew', 'speed', 'star', 'stroke', 
> 'strokewidth', 'text', 'textheight', 'textmetrics', 'textpath', 
> 'textwidth', 'transform', 'translate', 'var', 'wheeldelta', 'ximport'] 
>  
> This seems to suggest (to me) that there is a class object named Rect 
> in the default dir() 
> I may not have the correct nomenclature here, is there as default IDE 
> dir() module? 

There are the builtins.  Anything beyond that is put there by your
 IDE. And I don't know how you get from the function rect to the
 class Rect.  Python is case sensitive. I'm not sure what you mea
 n by class obmject. Are you perhaps meaning class instance?
 

>  
> Also, when I execute or run the following command, I get: 
> print 'dir(Rect):', dir(Rect) 
> dir(Rect): ['__call__', '__class__', '__cmp__', '__delattr__', 
> '__doc__', '__get__', '__getattribute__', '__hash__', '__init__', 
> '__new__', '__reduce__', '__reduce_ex__', '__repr__', '__setattr__', 
> '__str__', 'im_class', 'im_func', 'im_self'] 
>  
> Now, I am not sure if this helps, but if I put those two lines of code 
> into a file and call the module with the import command, I now get the 
> following output:: 
> # importer_test_2 
> import_test_2 

You should have gotten an error there, you presumably forgot the
 import keyword.  Or you pasted it wrong. 

> print 'dir:', dir() 
> print 'dir(Rect):', dir(Rect) 
>  
> dir: ['__builtins__', '__doc__', '__file__', '__name__', 'draw_rect', 
> 'nodebox'] 
>  
> dir(Rect):Traceback (most recent call last): 
>  File "nodebox/gui/mac/__init__.pyo", line 358, in _execScript 
>   File "/Users/apple/Documents/nodeBox/07_10_2014/importer_2.py", line 
> 2, in <module> 
>   File "/Users/apple/Documents/nodeBox/07_10_2014/import_test_2.py", 
> line 18, in <module> 
> NameError: name 'Rect' is not defined 

Well you can see that dir () doesn't show Rect, so dir Rect won't work.
> 
> Perhaps someone wiser than me, can suggest an approach, or something 
> that I might try? 
>  
> Thanks in anticipation. 
>  
> -u 
>  
> After some further tests, with Rect, and some Traceback messages 
> telling me that Rect(), which was located in DrawingPrimitives, was 
> deprecated, I found some changes noted posted on GitHub. Those at v 
> 1.9.0 seem apposite (I am running v1.9.5):
> for nodebox 1, v 1.9.7:
> ellipse() is an alias for oval(). Path.ellipse() works as well.
> Support for Line cap and line join styles. Use joinstyle() with MITER, 
> ROUND or BEVEL and capstyle() with BUTT, ROUND or SQUARE. 
> Path.joinstyle = MITER and Path.capstyle = BUTT works as well.
> for v1.9.0:
> NodeBox is now packaged: DrawingPrimitives is obsoleted in favor of 
> nodebox.graphics.This also means you can work directly with the context:
>  
> After some further try it and see tests, I noted the following:
> #nodebx_graphics.py
> print 'dir(nodebox.graphics.BezierPath):', 
> dir(nodebox.graphics.BezierPath)

Can't happen.  Your IDE is messing you up big time.  

> 
> dir(nodebox.graphics.BezierPath): ['__class__', '__delattr__', 
> '__dict__', '__doc__', '__getattribute__', '__getitem__', '__hash__', 
> '__init__', '__iter__', '__len__', '__module__', '__new__', 
> '__reduce__', '__reduce_ex__', '__repr__', '__setattr__', '__str__', 
> '__weakref__', '_draw', '_get_bounds', '_get_contours', '_get_fill', 
> '_get_length', '_get_path', '_get_stroke', '_get_strokewidth', 
> '_get_transform', '_get_transformmode', '_reset', '_set_fill', 
> '_set_stroke', '_set_strokewidth', '_set_transform', 
> '_set_transformmode', 'addpoint', 'append', 'bounds', 'checkKwargs', 
> 'closepath', 'contains', 'contours', 'copy', 'curveto', 'difference', 
> 'draw', 'extend', 'fill', 'fit', 'inheritFromContext', 'intersect', 
> 'intersects', 'kwargs', 'length', 'line', 'lineto', 'moveto', 'oval', 
> 'path', 'point', 'points', 'rect', 'reset', 'rotate', 'scale', 
> 'segmentlengths', 'setlinewidth', 'skew', 'stateAttributes', 'stroke', 
> 'strokewidth', 'transform', 'transformmode', 'translate', 'union', 
> 'xor']
> 
> Also, noted I can call the rect() function as follows:
> #nodebx_graphics.py
> import nodebox
> nodebox.graphics.BezierPath(rect(0, 0, 100, 100))

Now at least you're showing an import.  But if that reference to
 rect works, your library is doing some serious hacking.  And only
 if it's thoroughly documented would I continue using
 it.

> 
> However I still get a name error when I call it from another file, 
> which is what I am trying to do:
> #importer_nb_graphics
> import nodebox_graphics
> 
> Traceback (most recent call last):
>   File "nodebox/gui/mac/__init__.pyo", line 358, in _execScript
>   File "/Users/apple/Documents/nodeBox/07_10_2014/importer_nb_1.py", 
> line 2, in <module>
>   File "/Users/apple/Documents/nodeBox/07_10_2014/nodebox_graphics.py", 
> line 31, in <module>
> NameError: name 'rect' is not defined
> 
> I note that now the name error applies to 'rect' not 'Rect'

Of course,  that's what you tried to use.

> 
> As asked earlier, perhaps some Pythonistas here can suggest some 
> further try it and see tests for me to try?
> 
> PS. While I am here perhaps someone can also suggest a plain text 
> e-mail client, as I really dislike composing on mine in plain text. I 
> lose scroll bars, and text sometimes half fills the editor window when 
> saved as a draft draft, and re-opened.  Especially for you guys, I 
> wrote this in HTML, saved it, changed my setting, re-opened it, before 
> sending it.
> 
> 
> 

If Window or Linux,  use Thunderbird.  I don't know if it runs on
 osx, but I expect it does. Not on Android though and I'm still
 hunting. 
> 
>
> 


-- 
DaveA