Python error message "IndentationError: unindent does not match any outer indentation level"

Hi,

I am trying to use Python to compile cam.py, which is the only Gcode generator I found which takes .svg as its input.

(The source code of cam.py is [web.media.mit.edu].
The Python runs on Eclipse via a plugin called Pydev [pydev.org].)

The error message occurs:
" line += 1
^
IndentationError: unindent does not match any outer indentation level"


I know that Python is extremely strict with identation (a misuse of tab/space occurs the indentation error), so I suspect that, when I copy&paste the cam.py source code from a website into Python, I also pasted some unecessary tab/space that confuses Python.

I tried to fix the indentation problem by deleting/adding spaces to each line, but it is rather tedious, and I may accidentally create new bugs too. Therefore I am not sure how to solve this problem.

Could anyone help me with it? Thanks a lot!


-Bing

Edited 1 time(s). Last edit at 10/20/2009 01:21AM by BingDai.

Quote

BingDai Wrote:

> I know that Python is extremely strict with
> identation (a misuse of tab/space occurs the
> indentation error), so I suspect that, when I
> copy&paste the cam.py source code from a website
> into Python, I also pasted some unecessary
> tab/space that confuses Python.

You never copy and paste Pyhon Code from a website unless it has been copied from a forum which uses formatted code eg this forum has it

		for nCurvePoints in myCurvePoints:
			
			# Copy the first set of co-ordinates
			# ready for a isCyclic condtion
			if myBezPointNumber == 0:
				myFirstCoods = nCurvePoints
			
			# Apparently  BezTriple outputs 9 floats for each handle/knot in 3D space
			# so print out each float value
			print"\n##############################################"
			print"Bezier point number: %s" % myBezPointNumber
			print"Out of a total: %s" % myNumberOfPoints
			print"Current iteration at frame: %s\n" %  myCurrentPathLen
			print"H1x: %s " % nCurvePoints.vec[0][0]
			print"H1y: %s " % nCurvePoints.vec[0][1]
			print"H1z: %s " % nCurvePoints.vec[0][2]
			print"\n"
			print"Px: %s " % nCurvePoints.vec[1][0] 
			print"Py: %s " % nCurvePoints.vec[1][1] 
			print"Pz: %s " % nCurvePoints.vec[1][2]
			print"\n"
			print"H2x: %s " % nCurvePoints.vec[2][0] 
			print"H2y: %s " % nCurvePoints.vec[2][1]
			print"H2z: %s " % nCurvePoints.vec[2][2] 
			print"##############################################\n"

This is just an excerpt of a project I once did for Blender, thus it is working code

The best solution is to grab your code from its source and open it in a program like Notepad++

There you can format it, copy, paste or whatever you like but it must be a text editor (or IDE)

I have downloaded Notepad++ and tried it. It's really useful. Thanks!


-Bing

Python is based on identation.

In C++ We write something like
for(i=0;i<10;i++)
{
...
}

The code block is enclosed in { and }.

In Python, the indentation is what matters:

for i in range(10):
...

You have to make sure each indent level is the same. For example: (# denotes comments)

if i == 0:
... # indent level 1

for j in range(20):
... # indent level 2
...

... # <--- this has to be also indent level 1
... # Indent level 1 signifies end of for loop

... # <--- indent level 0 signifies end of if statement

It's essential when using Python to have a text editor that shows you the whitespace, as the whitespace is essentially part of the core. I think Notepad++ will do this, on Linux there is a plugin for gedit.

In Notepad++ it shows you each tab level, and the tab stops are like 4 white spaces, but don't use the space bar, just use the tab key

oops... just realized that my indentation didn't show up here