Infinitely prints fractal triangles using only one root expression and no statements.

triangle.py

(lambda:
    not globals().__setitem__('sys', __import__('sys'))
    and not globals().__setitem__('this', sys.modules[globals()['__name__']])
    and not globals().__setitem__('time', __import__('time'))
    and
    #program
    [setattr(this, k, v) for k,v in {
            'set_color': (lambda c: w(['*', ' '][c])),
            'abs': (lambda t: (t + (t >> 31)) ^ (t >> 31)),
            'w': sys.stdout.write,
            'smash': (lambda t: -((t * -1) >> 31)),
            'color': (lambda n,k: set_color(smash (k & (n - k)))),
            'col': (lambda n, k: k <= n and not color(n,k)  and col(n,k + 1)),
            'row': (lambda n: not w(' ' * (40-abs(n/2))) 
                              and (col(abs(n), 0) or True) 
                              and not w("\n") 
                              and (abs(n) < 63 or n < 0) 
                              and not time.sleep(0.05) 
                              and row(n+1)),
            'triangle': lambda: row(-60) or True and triangle()
        }.items() ] and triangle() )()

For compatibility with both Python 2 and 3, on line 14 replace n/2 with n//2.