Python colorsys.rgb_to_hls() Examples

def save(self, *args, **kwargs):
        if self.color is None:
            values = []
            for r in Resource.objects.filter(color__isnull=False):
                color = [int(r.color[i:i + 2], 16) / 255. for i in range(1, 6, 2)]
                h, _, _ = colorsys.rgb_to_hls(*color)
                values.append(h)
            values.sort()

            if values:
                prv = values[-1] - 1
            opt = 0, 0
            for val in values:
                delta, middle, prv = val - prv, (val + prv) * .5, val
                opt = max(opt, (delta, middle))
            h = opt[1] % 1
            color = colorsys.hls_to_rgb(h, .6, .5)

            self.color = '#' + ''.join(f'{int(c * 255):02x}' for c in color).upper()

        super().save(*args, **kwargs) 

def as_hsl_tuple(self, *, alpha: Optional[bool] = None) -> HslColorTuple:
        """
        Color as an HSL or HSLA tuple, e.g. hue, saturation, lightness and optionally alpha; all elements are in
        the range 0 to 1.

        NOTE: this is HSL as used in HTML and most other places, not HLS as used in python's colorsys.

        :param alpha: whether to include the alpha channel, options are
          None - (default) include alpha only if it's set (e.g. not None)
          True - always include alpha,
          False - always omit alpha,
        """
        h, l, s = rgb_to_hls(self._rgba.r, self._rgba.g, self._rgba.b)
        if alpha is None:
            if self._rgba.alpha is None:
                return h, s, l
            else:
                return h, s, l, self._alpha_float()
        if alpha:
            return h, s, l, self._alpha_float()
        else:
            # alpha is False
            return h, s, l 

def shift(color, amount):
  r, g, b, a = color

  print(("rgb", r, g, b, a))

  h, l, s = colorsys.rgb_to_hls(r, g, b)
  print(("hls", h, l, s))
  h *= 360
  h += int(amount)
  h %= 360
  h /= 360.0
  print(("hls", h, l, s))

  r, g, b = colorsys.hls_to_rgb(h, l, s)

  print(("rgb", int(r), int(g), int(b), a))

  return (int(r), int(g), int(b), a) 

def test_hls_values(self):
        values = [
            # rgb, hls
            ((0.0, 0.0, 0.0), (  0  , 0.0, 0.0)), # black
            ((0.0, 0.0, 1.0), (4./6., 0.5, 1.0)), # blue
            ((0.0, 1.0, 0.0), (2./6., 0.5, 1.0)), # green
            ((0.0, 1.0, 1.0), (3./6., 0.5, 1.0)), # cyan
            ((1.0, 0.0, 0.0), (  0  , 0.5, 1.0)), # red
            ((1.0, 0.0, 1.0), (5./6., 0.5, 1.0)), # purple
            ((1.0, 1.0, 0.0), (1./6., 0.5, 1.0)), # yellow
            ((1.0, 1.0, 1.0), (  0  , 1.0, 0.0)), # white
            ((0.5, 0.5, 0.5), (  0  , 0.5, 0.0)), # grey
        ]
        for (rgb, hls) in values:
            self.assertTripleEqual(hls, colorsys.rgb_to_hls(*rgb))
            self.assertTripleEqual(rgb, colorsys.hls_to_rgb(*hls)) 

def test_hls_values(self):
        values = [
            # rgb, hls
            ((0.0, 0.0, 0.0), (  0  , 0.0, 0.0)), # black
            ((0.0, 0.0, 1.0), (4./6., 0.5, 1.0)), # blue
            ((0.0, 1.0, 0.0), (2./6., 0.5, 1.0)), # green
            ((0.0, 1.0, 1.0), (3./6., 0.5, 1.0)), # cyan
            ((1.0, 0.0, 0.0), (  0  , 0.5, 1.0)), # red
            ((1.0, 0.0, 1.0), (5./6., 0.5, 1.0)), # purple
            ((1.0, 1.0, 0.0), (1./6., 0.5, 1.0)), # yellow
            ((1.0, 1.0, 1.0), (  0  , 1.0, 0.0)), # white
            ((0.5, 0.5, 0.5), (  0  , 0.5, 0.0)), # grey
        ]
        for (rgb, hls) in values:
            self.assertTripleEqual(hls, colorsys.rgb_to_hls(*rgb))
            self.assertTripleEqual(rgb, colorsys.hls_to_rgb(*hls)) 

def test_hls_values(self):
        values = [
            # rgb, hls
            ((0.0, 0.0, 0.0), (  0  , 0.0, 0.0)), # black
            ((0.0, 0.0, 1.0), (4./6., 0.5, 1.0)), # blue
            ((0.0, 1.0, 0.0), (2./6., 0.5, 1.0)), # green
            ((0.0, 1.0, 1.0), (3./6., 0.5, 1.0)), # cyan
            ((1.0, 0.0, 0.0), (  0  , 0.5, 1.0)), # red
            ((1.0, 0.0, 1.0), (5./6., 0.5, 1.0)), # purple
            ((1.0, 1.0, 0.0), (1./6., 0.5, 1.0)), # yellow
            ((1.0, 1.0, 1.0), (  0  , 1.0, 0.0)), # white
            ((0.5, 0.5, 0.5), (  0  , 0.5, 0.0)), # grey
        ]
        for (rgb, hls) in values:
            self.assertTripleEqual(hls, colorsys.rgb_to_hls(*rgb))
            self.assertTripleEqual(rgb, colorsys.hls_to_rgb(*hls)) 

def test_hls_values(self):
        values = [
            # rgb, hls
            ((0.0, 0.0, 0.0), (  0  , 0.0, 0.0)), # black
            ((0.0, 0.0, 1.0), (4./6., 0.5, 1.0)), # blue
            ((0.0, 1.0, 0.0), (2./6., 0.5, 1.0)), # green
            ((0.0, 1.0, 1.0), (3./6., 0.5, 1.0)), # cyan
            ((1.0, 0.0, 0.0), (  0  , 0.5, 1.0)), # red
            ((1.0, 0.0, 1.0), (5./6., 0.5, 1.0)), # purple
            ((1.0, 1.0, 0.0), (1./6., 0.5, 1.0)), # yellow
            ((1.0, 1.0, 1.0), (  0  , 1.0, 0.0)), # white
            ((0.5, 0.5, 0.5), (  0  , 0.5, 0.0)), # grey
        ]
        for (rgb, hls) in values:
            self.assertTripleEqual(hls, colorsys.rgb_to_hls(*rgb))
            self.assertTripleEqual(rgb, colorsys.hls_to_rgb(*hls)) 

def random_color():
    import random, colorsys
    
    red = (random.randrange(0, 256) + 256) / 2.0;
    green = (random.randrange(0, 256) + 256) / 2.0;
    blue = (random.randrange(0, 256) + 256) / 2.0;
    
    def to_hex(i):
        hx = hex(int(i))[2:]
        if len(hx) == 1:
            hx = "0" + hx
        return hx
    def to_color(r,g,b):
        cs = [to_hex(c) for c in [r,g,b]]
        return "#{cs[0]}{cs[1]}{cs[2]}".format(cs=cs)
    def darker(r,g,b):
        h,l,s = colorsys.rgb_to_hls(r/256.0, g/256.0, b/256.0)
        cs = [to_hex(256.0*c) for c in colorsys.hls_to_rgb(h,l/2.5,s)]
        return "#{cs[0]}{cs[1]}{cs[2]}".format(cs=cs)
    
    return {"background":to_color(red,green,blue),"foreground":darker(red,green,blue)} 

def test_hls_values(self):
        values = [
            # rgb, hls
            ((0.0, 0.0, 0.0), (  0  , 0.0, 0.0)), # black
            ((0.0, 0.0, 1.0), (4./6., 0.5, 1.0)), # blue
            ((0.0, 1.0, 0.0), (2./6., 0.5, 1.0)), # green
            ((0.0, 1.0, 1.0), (3./6., 0.5, 1.0)), # cyan
            ((1.0, 0.0, 0.0), (  0  , 0.5, 1.0)), # red
            ((1.0, 0.0, 1.0), (5./6., 0.5, 1.0)), # purple
            ((1.0, 1.0, 0.0), (1./6., 0.5, 1.0)), # yellow
            ((1.0, 1.0, 1.0), (  0  , 1.0, 0.0)), # white
            ((0.5, 0.5, 0.5), (  0  , 0.5, 0.0)), # grey
        ]
        for (rgb, hls) in values:
            self.assertTripleEqual(hls, colorsys.rgb_to_hls(*rgb))
            self.assertTripleEqual(rgb, colorsys.hls_to_rgb(*hls)) 

def test_include_can_measure_stdlib(self):
        self.make_file("mymain.py", """\
            import colorsys, random
            a = 1
            r, g, b = [random.random() for _ in range(3)]
            hls = colorsys.rgb_to_hls(r, g, b)
            """)

        # Measure without the stdlib, but include colorsys.
        cov1 = coverage.Coverage(cover_pylib=False, include=["*/colorsys.py"])
        self.start_import_stop(cov1, "mymain")

        # some statements were marked executed in colorsys.py
        _, statements, missing, _ = cov1.analysis("colorsys.py")
        self.assertNotEqual(statements, missing)
        # but none were in random.py
        _, statements, missing, _ = cov1.analysis("random.py")
        self.assertEqual(statements, missing) 

def _change_color_brightness(self, color, brightness_factor):
        """
        Depending on the brightness_factor, gives a lighter or darker color i.e. a color with
        less or more saturation than the original color.

        Args:
            color: color of the polygon. Refer to `matplotlib.colors` for a full list of
                formats that are accepted.
            brightness_factor (float): a value in [-1.0, 1.0] range. A lightness factor of
                0 will correspond to no change, a factor in [-1.0, 0) range will result in
                a darker color and a factor in (0, 1.0] range will result in a lighter color.

        Returns:
            modified_color (tuple[double]): a tuple containing the RGB values of the
                modified color. Each value in the tuple is in the [0.0, 1.0] range.
        """
        assert brightness_factor >= -1.0 and brightness_factor <= 1.0
        color = mplc.to_rgb(color)
        polygon_color = colorsys.rgb_to_hls(*mplc.to_rgb(color))
        modified_lightness = polygon_color[1] + (brightness_factor * polygon_color[1])
        modified_lightness = 0.0 if modified_lightness < 0.0 else modified_lightness
        modified_lightness = 1.0 if modified_lightness > 1.0 else modified_lightness
        modified_color = colorsys.hls_to_rgb(polygon_color[0], modified_lightness, polygon_color[2])
        return modified_color 

def test_hls_values(self):
        values = [
            # rgb, hls
            ((0.0, 0.0, 0.0), (  0  , 0.0, 0.0)), # black
            ((0.0, 0.0, 1.0), (4./6., 0.5, 1.0)), # blue
            ((0.0, 1.0, 0.0), (2./6., 0.5, 1.0)), # green
            ((0.0, 1.0, 1.0), (3./6., 0.5, 1.0)), # cyan
            ((1.0, 0.0, 0.0), (  0  , 0.5, 1.0)), # red
            ((1.0, 0.0, 1.0), (5./6., 0.5, 1.0)), # purple
            ((1.0, 1.0, 0.0), (1./6., 0.5, 1.0)), # yellow
            ((1.0, 1.0, 1.0), (  0  , 1.0, 0.0)), # white
            ((0.5, 0.5, 0.5), (  0  , 0.5, 0.0)), # grey
        ]
        for (rgb, hls) in values:
            self.assertTripleEqual(hls, colorsys.rgb_to_hls(*rgb))
            self.assertTripleEqual(rgb, colorsys.hls_to_rgb(*hls)) 

def test_hls_values(self):
        values = [
            # rgb, hls
            ((0.0, 0.0, 0.0), (  0  , 0.0, 0.0)), # black
            ((0.0, 0.0, 1.0), (4./6., 0.5, 1.0)), # blue
            ((0.0, 1.0, 0.0), (2./6., 0.5, 1.0)), # green
            ((0.0, 1.0, 1.0), (3./6., 0.5, 1.0)), # cyan
            ((1.0, 0.0, 0.0), (  0  , 0.5, 1.0)), # red
            ((1.0, 0.0, 1.0), (5./6., 0.5, 1.0)), # purple
            ((1.0, 1.0, 0.0), (1./6., 0.5, 1.0)), # yellow
            ((1.0, 1.0, 1.0), (  0  , 1.0, 0.0)), # white
            ((0.5, 0.5, 0.5), (  0  , 0.5, 0.0)), # grey
        ]
        for (rgb, hls) in values:
            self.assertTripleEqual(hls, colorsys.rgb_to_hls(*rgb))
            self.assertTripleEqual(rgb, colorsys.hls_to_rgb(*hls)) 

def test_hls_values(self):
        values = [
            # rgb, hls
            ((0.0, 0.0, 0.0), (  0  , 0.0, 0.0)), # black
            ((0.0, 0.0, 1.0), (4./6., 0.5, 1.0)), # blue
            ((0.0, 1.0, 0.0), (2./6., 0.5, 1.0)), # green
            ((0.0, 1.0, 1.0), (3./6., 0.5, 1.0)), # cyan
            ((1.0, 0.0, 0.0), (  0  , 0.5, 1.0)), # red
            ((1.0, 0.0, 1.0), (5./6., 0.5, 1.0)), # purple
            ((1.0, 1.0, 0.0), (1./6., 0.5, 1.0)), # yellow
            ((1.0, 1.0, 1.0), (  0  , 1.0, 0.0)), # white
            ((0.5, 0.5, 0.5), (  0  , 0.5, 0.0)), # grey
        ]
        for (rgb, hls) in values:
            self.assertTripleEqual(hls, colorsys.rgb_to_hls(*rgb))
            self.assertTripleEqual(rgb, colorsys.hls_to_rgb(*hls)) 

def make_icon(template, color):
        """
        Create an icon for the specified user color. It will be used to
        generate on the fly an icon representing the user.
        """
        # Get a light and dark version of the user color
        r, g, b = StatusWidget.ida_to_python(color)
        h, l, s = colorsys.rgb_to_hls(r, g, b)
        r, g, b = colorsys.hls_to_rgb(h, 0.5, 1.0)
        light = StatusWidget.python_to_qt(r, g, b)
        r, g, b = colorsys.hls_to_rgb(h, 0.25, 1.0)
        dark = StatusWidget.python_to_qt(r, g, b)

        # Replace the icon pixel with our two colors
        image = QImage(template)
        for x in range(image.width()):
            for y in range(image.height()):
                c = image.pixel(x, y)
                if (c & 0xFFFFFF) == 0xFFFFFF:
                    image.setPixel(x, y, light)
                if (c & 0xFFFFFF) == 0x000000:
                    image.setPixel(x, y, dark)
        return QPixmap(image) 

def _change_color_brightness(self, color, brightness_factor):
        """
        Depending on the brightness_factor, gives a lighter or darker color i.e. a color with
        less or more saturation than the original color.

        Args:
            color: color of the polygon. Refer to `matplotlib.colors` for a full list of
                formats that are accepted.
            brightness_factor (float): a value in [-1.0, 1.0] range. A lightness factor of
                0 will correspond to no change, a factor in [-1.0, 0) range will result in
                a darker color and a factor in (0, 1.0] range will result in a lighter color.

        Returns:
            modified_color (tuple[double]): a tuple containing the RGB values of the
                modified color. Each value in the tuple is in the [0.0, 1.0] range.
        """
        assert brightness_factor >= -1.0 and brightness_factor <= 1.0
        color = mplc.to_rgb(color)
        polygon_color = colorsys.rgb_to_hls(*mplc.to_rgb(color))
        modified_lightness = polygon_color[1] + (brightness_factor * polygon_color[1])
        modified_lightness = 0.0 if modified_lightness < 0.0 else modified_lightness
        modified_lightness = 1.0 if modified_lightness > 1.0 else modified_lightness
        modified_color = colorsys.hls_to_rgb(polygon_color[0], modified_lightness, polygon_color[2])
        return modified_color 

def test_hls_values(self):
        values = [
            # rgb, hls
            ((0.0, 0.0, 0.0), (  0  , 0.0, 0.0)), # black
            ((0.0, 0.0, 1.0), (4./6., 0.5, 1.0)), # blue
            ((0.0, 1.0, 0.0), (2./6., 0.5, 1.0)), # green
            ((0.0, 1.0, 1.0), (3./6., 0.5, 1.0)), # cyan
            ((1.0, 0.0, 0.0), (  0  , 0.5, 1.0)), # red
            ((1.0, 0.0, 1.0), (5./6., 0.5, 1.0)), # purple
            ((1.0, 1.0, 0.0), (1./6., 0.5, 1.0)), # yellow
            ((1.0, 1.0, 1.0), (  0  , 1.0, 0.0)), # white
            ((0.5, 0.5, 0.5), (  0  , 0.5, 0.0)), # grey
        ]
        for (rgb, hls) in values:
            self.assertTripleEqual(hls, colorsys.rgb_to_hls(*rgb))
            self.assertTripleEqual(rgb, colorsys.hls_to_rgb(*hls)) 

def darken_color(color, amount=0.5):
    """
    Darkens the given color by multiplying luminosity by the given amount.
    Input can be matplotlib color string, hex string, or RGB tuple.

    Examples:
    >> lighten_color('g', 0.3)
    >> lighten_color('#F034A3', 0.6)
    >> lighten_color((.3,.55,.1), 0.5)
    """
    import matplotlib.colors as mc
    import colorsys
    try:
        c = mc.cnames[color]
    except:
        c = color
    c = colorsys.rgb_to_hls(*mc.to_rgb(c))
    return colorsys.hls_to_rgb(c[0], amount * c[1], c[2]) 

def test_include_can_measure_stdlib(self):
        self.make_file("mymain.py", """\
            import colorsys, random
            a = 1
            r, g, b = [random.random() for _ in range(3)]
            hls = colorsys.rgb_to_hls(r, g, b)
            """)

        # Measure without the stdlib, but include colorsys.
        cov1 = coverage.Coverage(cover_pylib=False, include=["*/colorsys.py"])
        self.start_import_stop(cov1, "mymain")

        # some statements were marked executed in colorsys.py
        _, statements, missing, _ = cov1.analysis("colorsys.py")
        self.assertNotEqual(statements, missing)
        # but none were in random.py
        _, statements, missing, _ = cov1.analysis("random.py")
        self.assertEqual(statements, missing) 

def lighten_color(color, amount=0.5):
    """
    Lightens the given color by multiplying (1-luminosity) by the given amount.
    Input can be matplotlib color string, hex string, or RGB tuple.

    Examples:
    >> lighten_color('g', 0.3)
    >> lighten_color('#F034A3', 0.6)
    >> lighten_color((.3,.55,.1), 0.5)
    """
    import matplotlib.colors as mc
    import colorsys
    try:
        c = mc.cnames[color]
    except:
        c = color
    c = colorsys.rgb_to_hls(*mc.to_rgb(c))
    return colorsys.hls_to_rgb(c[0], 1 - amount * (1 - c[1]), c[2]) 

def test_hls_values(self):
        values = [
            # rgb, hls
            ((0.0, 0.0, 0.0), (  0  , 0.0, 0.0)), # black
            ((0.0, 0.0, 1.0), (4./6., 0.5, 1.0)), # blue
            ((0.0, 1.0, 0.0), (2./6., 0.5, 1.0)), # green
            ((0.0, 1.0, 1.0), (3./6., 0.5, 1.0)), # cyan
            ((1.0, 0.0, 0.0), (  0  , 0.5, 1.0)), # red
            ((1.0, 0.0, 1.0), (5./6., 0.5, 1.0)), # purple
            ((1.0, 1.0, 0.0), (1./6., 0.5, 1.0)), # yellow
            ((1.0, 1.0, 1.0), (  0  , 1.0, 0.0)), # white
            ((0.5, 0.5, 0.5), (  0  , 0.5, 0.0)), # grey
        ]
        for (rgb, hls) in values:
            self.assertTripleEqual(hls, colorsys.rgb_to_hls(*rgb))
            self.assertTripleEqual(rgb, colorsys.hls_to_rgb(*hls)) 

def adjust_lightness(color, amount=0.7):
    """Lightens the given color by multiplying (1-luminosity) by the given amount.

    Input can be matplotlib color string, hex string, or RGB tuple.
    Output will be an RGB string."""
    import matplotlib.colors as mc
    import colorsys
    try:
        c = mc.cnames[color]
    except:
        c = color
    c = colorsys.rgb_to_hls(*mc.to_rgb(c))
    rgb = colorsys.hls_to_rgb(c[0], max(0, min(1, amount * c[1])), c[2])
    return 'rgb(%d,%d,%d)' % (int(rgb[0]*255), int(rgb[1]*255), int(rgb[2]*255)) 

def transform_attrs(self, attrs: Attrs) -> Attrs:
        min_brightness = to_float(self.min_brightness)
        max_brightness = to_float(self.max_brightness)
        assert 0 <= min_brightness <= 1
        assert 0 <= max_brightness <= 1

        # Don't do anything if the whole brightness range is acceptable.
        # This also avoids turning ansi colors into RGB sequences.
        if min_brightness == 0.0 and max_brightness == 1.0:
            return attrs

        # If a foreground color is given without a background color.
        no_background = not attrs.bgcolor or attrs.bgcolor == "default"
        has_fgcolor = attrs.color and attrs.color != "ansidefault"

        if has_fgcolor and no_background:
            # Calculate new RGB values.
            r, g, b = self._color_to_rgb(attrs.color or "")
            hue, brightness, saturation = rgb_to_hls(r, g, b)
            brightness = self._interpolate_brightness(
                brightness, min_brightness, max_brightness
            )
            r, g, b = hls_to_rgb(hue, brightness, saturation)
            new_color = "%02x%02x%02x" % (int(r * 255), int(g * 255), int(b * 255))

            attrs = attrs._replace(color=new_color)

        return attrs 

def tohls(self):
        """Convert to `HLS` color format."""

        return rgb_to_hls(self.r * RGB_CHANNEL_SCALE, self.g * RGB_CHANNEL_SCALE, self.b * RGB_CHANNEL_SCALE) 

def blend(self, color, percent, alpha=False, color_space=CS_RGB):
        """Blend color."""

        r, g, b, a = self._split_channels(color)
        factor = clamp(clamp(float(percent), 0.0, 100.0) * SCALE_PERCENT, 0.0, 1.0)

        if color_space == CS_RGB:
            self.r = rgb_blend_channel(self.r, r, factor)
            self.g = rgb_blend_channel(self.g, g, factor)
            self.b = rgb_blend_channel(self.b, b, factor)
        elif color_space == CS_HSL:
            orig_h, orig_l, orig_s = self.tohls()
            blend_h, blend_l, blend_s = rgb_to_hls(r * RGB_CHANNEL_SCALE, g * RGB_CHANNEL_SCALE, b * RGB_CHANNEL_SCALE)
            h = hue_blend_channel(orig_h, blend_h, factor)
            l = percent_blend_channel(orig_l, blend_l, factor)
            s = percent_blend_channel(orig_s, blend_s, factor)
            self.fromhls(h, l, s)
        elif color_space == CS_HWB:
            orig_h, orig_w, orig_b = self.tohwb()
            blend_h, s, v = rgb_to_hsv(r * RGB_CHANNEL_SCALE, g * RGB_CHANNEL_SCALE, b * RGB_CHANNEL_SCALE)
            blend_w = (1.0 - s) * v
            blend_b = 1.0 - v
            h = hue_blend_channel(orig_h, blend_h, factor)
            w = percent_blend_channel(orig_w, blend_w, factor)
            b = percent_blend_channel(orig_b, blend_b, factor)
            self.fromhwb(h, w, b)
        else:
            raise ValueError('Invalid color space value: {}'.format(str(color_space)))

        if alpha:
            self.a = rgb_blend_channel(self.a, a, factor) 

def closeness(color_a, color_b):
  ra, ga, ba, aa = color_a
  rb, gb, bb, ab = color_b

  ha, la, sa = colorsys.rgb_to_hls(ra, ga, ba)
  hb, lb, sb = colorsys.rgb_to_hls(rb, gb, bb)

  maxh = max(ha, hb)
  minh = min(ha, hb)
  difference = min(maxh-minh, (minh+1)-maxh)

  return difference 

def test_hls_roundtrip(self):
        for r in frange(0.0, 1.0, 0.2):
            for g in frange(0.0, 1.0, 0.2):
                for b in frange(0.0, 1.0, 0.2):
                    rgb = (r, g, b)
                    self.assertTripleEqual(
                        rgb,
                        colorsys.hls_to_rgb(*colorsys.rgb_to_hls(*rgb))
                    ) 

def test_ignore_stdlib(self):
        self.make_file("mymain.py", """\
            import colorsys
            a = 1
            hls = colorsys.rgb_to_hls(1.0, 0.5, 0.0)
            """)

        # Measure without the stdlib.
        cov1 = coverage.Coverage()
        self.assertEqual(cov1.config.cover_pylib, False)
        self.start_import_stop(cov1, "mymain")

        # some statements were marked executed in mymain.py
        _, statements, missing, _ = cov1.analysis("mymain.py")
        self.assertNotEqual(statements, missing)
        # but none were in colorsys.py
        _, statements, missing, _ = cov1.analysis("colorsys.py")
        self.assertEqual(statements, missing)

        # Measure with the stdlib.
        cov2 = coverage.Coverage(cover_pylib=True)
        self.start_import_stop(cov2, "mymain")

        # some statements were marked executed in mymain.py
        _, statements, missing, _ = cov2.analysis("mymain.py")
        self.assertNotEqual(statements, missing)
        # and some were marked executed in colorsys.py
        _, statements, missing, _ = cov2.analysis("colorsys.py")
        self.assertNotEqual(statements, missing) 

def test_hls_roundtrip(self):
        for r in frange(0.0, 1.0, 0.2):
            for g in frange(0.0, 1.0, 0.2):
                for b in frange(0.0, 1.0, 0.2):
                    rgb = (r, g, b)
                    self.assertTripleEqual(
                        rgb,
                        colorsys.hls_to_rgb(*colorsys.rgb_to_hls(*rgb))
                    ) 

def test_hls_roundtrip(self):
        for r in frange(0.0, 1.0, 0.2):
            for g in frange(0.0, 1.0, 0.2):
                for b in frange(0.0, 1.0, 0.2):
                    rgb = (r, g, b)
                    self.assertTripleEqual(
                        rgb,
                        colorsys.hls_to_rgb(*colorsys.rgb_to_hls(*rgb))
                    )