A 3d drawer

iso.py

SCALE, Point, Drawer, run, run_lines = 25, type('Point', (), {'__init__': lambda self, x, y, z: [None, [setattr(self, a, b) for a, b in zip('x y z _x _y _z'.split(), [x, y, z, x*SCALE, y*SCALE, z*SCALE])]][0]}), type('Drawer', (__import__('turtle').Turtle,), {'go_home': lambda self: [self.pu(),self.home(),self.pd()],'go_to_point': lambda self, p: [self.home(),self.seth(150),self.fd(p._x),self.seth(30),self.fd(p._y),self.seth(90),self.fd(p._z)],'draw_line': lambda self, p1, p2: [self.pu(),self.go_to_point(p2),position := self.pos(),self.go_to_point(p1),self.pd(),self.goto(position)],'draw_shape': lambda self, *l: [self.draw_line(l[x - 1], l[x]) for x in range(len(l))]}), lambda t, i: {'pu': t.pu, 'pd': t.pd, 'gp': t.go_to_point, 'dl': t.draw_line, 'ds': t.draw_shape, 'ex': __import__('sys').exit, 'cl': t.reset}.get(i[:2], lambda *a: print('?'))(*([Point(*[float(y.strip()) for y in x.split(',')]) for x in i[2:].split(';')] if len(i) != 2 else [])), lambda s: [t := Drawer(), t.speed(0), [run(t, w) for x in s.split('\n') if (w:=x.strip())], t.go_home()]
# run_lines("ds0,0,0;3,0,0;3,0,3\nds0,2,0;3,2,0;3,2,3\ndl3,0,0;3,2,0\nds0,0,0;0,1,3;0,2,0\nds3,0,3;0,1,3;3,2,3")  # prob 21
# run_lines("ds0,0,0;3,0,0;3,0,2;2,0,2;2,0,1;0,0,1\nds0,2,0;3,2,0;3,2,2;0,2,2\ndl0,0,0;0,2,0\ndl3,0,0;3,2,0\ndl3,0,2;3,2,2\ndl0,0,1;0,2,2\ndl2,0,1;0,2,2\ndl2,0,2;0,2,2\n") # prob 23

Now, it's minimized. For the big, actual version with the shell and everything, just look at the previous commit.

To run a sample model, just uncomment one of bottom two lines. These were given to me as an assignment in class to draw.