Speeding up Simple Canvas Loop

[Randall Hopper]

Michael P. Reilly:
 |Randall Hopper <aa8vb at vislab.epa.gov> wrote:
 |:     create_line = canvas.create_line
 |:     for line in lines:
 |:       create_line( line, width=0 )
 |
 |You can either use one call to create_line or use create_polygon.
 |
 |  # just get the first endpoint of each line
 |  vertices = map(lambda a, b: a, lines)
 |  # add the first vertex to the end to close the polygon
 |  canvas.create_line( vertices + vertices[:1], width=0 )

I don't understand this.  Correct me if I'm wrong, but this will simply
draw one multi-segment line which connects all the first-points of the
lines.

I believe it also assumes each line in "lines" is a 2-point line.  In fact,
these lines each have a variable number of points (2 to hundreds) already.

 |or
 |  canvas.create_polygon( vertices, width=0 )

These are distinct multi-point lines, so I can't just connect all the
points together.

Randall