diff --git a/Tests/test_color_lut.py b/Tests/test_color_lut.py
index 120ff777e..d2e2d5156 100644
--- a/Tests/test_color_lut.py
+++ b/Tests/test_color_lut.py
@@ -567,7 +567,7 @@ class TestTransformColorLut3D:
         assert tuple(lut.size) == tuple(source.size)
         assert len(lut.table) == len(source.table)
         assert lut.table != source.table
-        assert lut.table[0:10] == [0.0, 0.0, 0.0, 0.25, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0]
+        assert lut.table[:10] == [0.0, 0.0, 0.0, 0.25, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0]
 
     def test_3_to_4_channels(self):
         source = ImageFilter.Color3DLUT.generate((6, 5, 4), lambda r, g, b: (r, g, b))
@@ -576,7 +576,7 @@ class TestTransformColorLut3D:
         assert len(lut.table) != len(source.table)
         assert lut.table != source.table
         # fmt: off
-        assert lut.table[0:16] == [
+        assert lut.table[:16] == [
             0.0, 0.0, 0.0, 1,  0.2**2, 0.0, 0.0, 1,
             0.4**2, 0.0, 0.0, 1,  0.6**2, 0.0, 0.0, 1]
         # fmt: on
@@ -592,7 +592,7 @@ class TestTransformColorLut3D:
         assert len(lut.table) != len(source.table)
         assert lut.table != source.table
         # fmt: off
-        assert lut.table[0:18] == [
+        assert lut.table[:18] == [
             1.0, 1.0, 1.0,  0.75, 1.0, 1.0,  0.0, 1.0, 1.0,
             1.0, 0.96, 1.0,  0.75, 0.96, 1.0,  0.0, 0.96, 1.0]
         # fmt: on
@@ -606,7 +606,7 @@ class TestTransformColorLut3D:
         assert len(lut.table) == len(source.table)
         assert lut.table != source.table
         # fmt: off
-        assert lut.table[0:16] == [
+        assert lut.table[:16] == [
             0.0, 0.0, 0.0, 0.5,  0.2**2, 0.0, 0.0, 0.5,
             0.4**2, 0.0, 0.0, 0.5,  0.6**2, 0.0, 0.0, 0.5]
         # fmt: on
@@ -622,7 +622,7 @@ class TestTransformColorLut3D:
         assert len(lut.table) == len(source.table)
         assert lut.table != source.table
         # fmt: off
-        assert lut.table[0:18] == [
+        assert lut.table[:18] == [
             0.0, 0.0, 0.0,  0.16, 0.0, 0.0,  0.24, 0.0, 0.0,
             0.24, 0.0, 0.0,  0.8 - (0.8**2), 0, 0,  0, 0, 0]
         # fmt: on
@@ -639,7 +639,7 @@ class TestTransformColorLut3D:
         assert len(lut.table) == len(source.table)
         assert lut.table != source.table
         # fmt: off
-        assert lut.table[0:16] == [
+        assert lut.table[:16] == [
             0.0, 0.0, 0.0, 0.5,  0.25, 0.0, 0.0, 0.5,
             0.0, 0.0, 0.0, 0.5,  0.0, 0.16, 0.0, 0.5]
         # fmt: on
diff --git a/Tests/test_imagesequence.py b/Tests/test_imagesequence.py
index 7cf237b46..d79e8e525 100644
--- a/Tests/test_imagesequence.py
+++ b/Tests/test_imagesequence.py
@@ -77,9 +77,9 @@ def test_consecutive():
 def test_palette_mmap():
     # Using mmap in ImageFile can require to reload the palette.
     with Image.open("Tests/images/multipage-mmap.tiff") as im:
-        color1 = im.getpalette()[0:3]
+        color1 = im.getpalette()[:3]
         im.seek(0)
-        color2 = im.getpalette()[0:3]
+        color2 = im.getpalette()[:3]
         assert color1 == color2
 
 
diff --git a/src/PIL/GribStubImagePlugin.py b/src/PIL/GribStubImagePlugin.py
index cc9bc2639..4575f8237 100644
--- a/src/PIL/GribStubImagePlugin.py
+++ b/src/PIL/GribStubImagePlugin.py
@@ -29,7 +29,7 @@ def register_handler(handler):
 
 
 def _accept(prefix):
-    return prefix[0:4] == b"GRIB" and prefix[7] == 1
+    return prefix[:4] == b"GRIB" and prefix[7] == 1
 
 
 class GribStubImageFile(ImageFile.StubImageFile):
diff --git a/src/PIL/ImImagePlugin.py b/src/PIL/ImImagePlugin.py
index f7e690b35..5563da4f5 100644
--- a/src/PIL/ImImagePlugin.py
+++ b/src/PIL/ImImagePlugin.py
@@ -210,7 +210,7 @@ class ImImageFile(ImageFile.ImageFile):
         self.mode = self.info[MODE]
 
         # Skip forward to start of image data
-        while s and s[0:1] != b"\x1A":
+        while s and s[:1] != b"\x1A":
             s = self.fp.read(1)
         if not s:
             raise SyntaxError("File truncated")
diff --git a/src/PIL/Image.py b/src/PIL/Image.py
index ca7f8308e..853ed15d5 100644
--- a/src/PIL/Image.py
+++ b/src/PIL/Image.py
@@ -2582,7 +2582,7 @@ class Image:
         h = box[3] - box[1]
 
         if method == Transform.AFFINE:
-            data = data[0:6]
+            data = data[:6]
 
         elif method == Transform.EXTENT:
             # convert extent to an affine transform
@@ -2593,12 +2593,12 @@ class Image:
             data = (xs, 0, x0, 0, ys, y0)
 
         elif method == Transform.PERSPECTIVE:
-            data = data[0:8]
+            data = data[:8]
 
         elif method == Transform.QUAD:
             # quadrilateral warp.  data specifies the four corners
             # given as NW, SW, SE, and NE.
-            nw = data[0:2]
+            nw = data[:2]
             sw = data[2:4]
             se = data[4:6]
             ne = data[6:8]
diff --git a/src/PIL/ImageColor.py b/src/PIL/ImageColor.py
index 958635bf9..3cf9ddafc 100644
--- a/src/PIL/ImageColor.py
+++ b/src/PIL/ImageColor.py
@@ -133,7 +133,7 @@ def getcolor(color, mode):
     # same as getrgb, but converts the result to the given mode
     color, alpha = getrgb(color), 255
     if len(color) == 4:
-        color, alpha = color[0:3], color[3]
+        color, alpha = color[:3], color[3]
 
     if Image.getmodebase(mode) == "L":
         r, g, b = color
diff --git a/src/PIL/ImageMorph.py b/src/PIL/ImageMorph.py
index fe0083754..1e22c36a8 100644
--- a/src/PIL/ImageMorph.py
+++ b/src/PIL/ImageMorph.py
@@ -119,13 +119,13 @@ class LutBuilder:
         # mirror
         if "M" in options:
             n = len(patterns)
-            for pattern, res in patterns[0:n]:
+            for pattern, res in patterns[:n]:
                 patterns.append((self._string_permute(pattern, MIRROR_MATRIX), res))
 
         # negate
         if "N" in options:
             n = len(patterns)
-            for pattern, res in patterns[0:n]:
+            for pattern, res in patterns[:n]:
                 # Swap 0 and 1
                 pattern = pattern.replace("0", "Z").replace("1", "0").replace("Z", "1")
                 res = 1 - int(res)
diff --git a/src/PIL/JpegImagePlugin.py b/src/PIL/JpegImagePlugin.py
index aae2a4591..92417eacd 100644
--- a/src/PIL/JpegImagePlugin.py
+++ b/src/PIL/JpegImagePlugin.py
@@ -330,7 +330,7 @@ MARKER = {
 
 def _accept(prefix):
     # Magic number was taken from https://en.wikipedia.org/wiki/JPEG
-    return prefix[0:3] == b"\xFF\xD8\xFF"
+    return prefix[:3] == b"\xFF\xD8\xFF"
 
 
 ##
diff --git a/src/PIL/PaletteFile.py b/src/PIL/PaletteFile.py
index 6ccaa1f53..ee9dca860 100644
--- a/src/PIL/PaletteFile.py
+++ b/src/PIL/PaletteFile.py
@@ -31,7 +31,7 @@ class PaletteFile:
 
             if not s:
                 break
-            if s[0:1] == b"#":
+            if s[:1] == b"#":
                 continue
             if len(s) > 100:
                 raise SyntaxError("bad palette file")
diff --git a/src/PIL/XpmImagePlugin.py b/src/PIL/XpmImagePlugin.py
index 19c50cafc..aaed2039d 100644
--- a/src/PIL/XpmImagePlugin.py
+++ b/src/PIL/XpmImagePlugin.py
@@ -83,7 +83,7 @@ class XpmImageFile(ImageFile.ImageFile):
                     rgb = s[i + 1]
                     if rgb == b"None":
                         self.info["transparency"] = c
-                    elif rgb[0:1] == b"#":
+                    elif rgb[:1] == b"#":
                         # FIXME: handle colour names (see ImagePalette.py)
                         rgb = int(rgb[1:], 16)
                         palette[c] = (