Repository: matplotlib/matplotlib
File: lib/matplotlib/backend_bases.py (Python)

Code before:
            return (itertools.cycle(seq) if len(seq)
                    else itertools.repeat(default))

        pathids = cycle_or_default(path_ids)
        toffsets = cycle_or_default(offset_trans.transform(offsets), (0, 0))
        fcs = cycle_or_default(facecolors)
        ecs = cycle_or_default(edgecolors)
        hcs = cycle_or_default(hatchcolors)
        lws = cycle_or_default(linewidths)
        lss = cycle_or_default(linestyles)
        aas = cycle_or_default(antialiaseds)
        urls = cycle_or_default(urls)

        if Nedgecolors == 0:
            gc0.set_linewidth(0.0)

        for pathid, (xo, yo), fc, ec, hc, lw, ls, aa, url in itertools.islice(
                zip(pathids, toffsets, fcs, ecs, hcs, lws, lss, aas, urls), N):
            if not (np.isfinite(xo) and np.isfinite(yo)):
                continue
            if Nedgecolors:
                if Nlinewidths:
                    gc0.set_linewidth(lw)
                if Nlinestyles:
                    gc0.set_dashes(*ls)
                ec_is_seq = (
                    isinstance(ec, (np.ndarray, list, tuple))
                    and not isinstance(ec, str)
                )
                if isinstance(ec, np.ndarray):
                    ec = tuple(ec.tolist())
                elif isinstance(ec, list):
                    ec = tuple(ec)
                if ec_is_seq and len(ec) == 4 and ec[3] == 0.0:
                    gc0.set_linewidth(0)
                else:
                    if ec_is_seq and len(ec) == 4:
                        gc0.set_foreground(ec, isRGBA=True)
                    else:
                        gc0.set_foreground(ec)
            if Nhatchcolors:
                gc0.set_hatch_color(hc)
            if fc is not None and len(fc) == 4 and fc[3] == 0:
                fc = None
            gc0.set_antialiased(aa)
            if Nurls:
                gc0.set_url(url)
            yield xo, yo, pathid, gc0, fc
        gc0.restore()

    def get_image_magnification(self):

Review comment (refactor):
This function is looping through the properties of a `Collection`.  Have you learned anything about `Collection` edgecolors that can help you simplify this?

Code after:
            return (itertools.cycle(seq) if len(seq)
                    else itertools.repeat(default))

        pathids = cycle_or_default(path_ids)
        toffsets = cycle_or_default(offset_trans.transform(offsets), (0, 0))
        fcs = cycle_or_default(facecolors)
        ecs = cycle_or_default(edgecolors)
        hcs = cycle_or_default(hatchcolors)
        lws = cycle_or_default(linewidths)
        lss = cycle_or_default(linestyles)
        aas = cycle_or_default(antialiaseds)
        urls = cycle_or_default(urls)

        if Nedgecolors == 0:
            gc0.set_linewidth(0.0)

        for pathid, (xo, yo), fc, ec, hc, lw, ls, aa, url in itertools.islice(
                zip(pathids, toffsets, fcs, ecs, hcs, lws, lss, aas, urls), N):
            if not (np.isfinite(xo) and np.isfinite(yo)):
                continue
            if Nedgecolors:
                if Nlinewidths:
                    gc0.set_linewidth(lw)
                if Nlinestyles:
                    gc0.set_dashes(*ls)
                ec_rgba = colors.to_rgba(ec)
                # Fully transparent edges are treated as "no stroke".
                if ec_rgba[3] == 0.0:
                    gc0.set_linewidth(0)
                else:
                    gc0.set_foreground(ec_rgba, isRGBA=True)
            if Nhatchcolors:
                gc0.set_hatch_color(hc)
            if fc is not None and len(fc) == 4 and fc[3] == 0:
                fc = None
            gc0.set_antialiased(aa)
            if Nurls:
                gc0.set_url(url)
            yield xo, yo, pathid, gc0, fc
        gc0.restore()

    def get_image_magnification(self):
        """
        Get the factor by which to magnify images passed to `draw_image`.
        Allows a backend to have images at a different resolution to other
        artists.
        """
        return 1.0

    def draw_image(self, gc, x, y, im, transform=None):
        """