Cherry-pick of portions of patch a500ca1, many shortcut ops added, no…

… functional changes

PIL/ArgImagePlugin.py

@@ -370,7 +370,7 @@ def __store(self):
                 im1 = im1.chop_add_modulo(im0.crop(bbox))
             im0.paste(im1, bbox)
 
-        self.count = self.count - 1
+        self.count -= 1
 
         if self.count == 0 and self.show:
             self.im = self.images[self.id]

PIL/BdfFontFile.py

@@ -128,5 +128,5 @@ def __init__(self, fp):
             if not c:
                 break
             id, ch, (xy, dst, src), im = c
-            if ch >= 0 and ch < len(self.glyph):
+            if 0 <= ch < len(self.glyph):
                 self.glyph[ch] = xy, dst, src, im

PIL/EpsImagePlugin.py

@@ -93,7 +93,7 @@ def Ghostscript(tile, size, fp, scale=1):
             s = fp.read(100*1024)
             if not s:
                 break
-            length = length - len(s)
+            length -= len(s)
             f.write(s)
 
     # Build ghostscript command
@@ -148,7 +148,7 @@ def read(self, count):
     def tell(self):
         pos = self.fp.tell()
         if self.char:
-            pos = pos - 1
+            pos -= 1
         return pos
     def readline(self):
         s = b""

PIL/ExifTags.py

@@ -63,15 +63,12 @@
     0x0201: "JpegIFOffset",
     0x0202: "JpegIFByteCount",
     0x0211: "YCbCrCoefficients",
-    0x0211: "YCbCrCoefficients",
     0x0212: "YCbCrSubSampling",
     0x0213: "YCbCrPositioning",
-    0x0213: "YCbCrPositioning",
-    0x0214: "ReferenceBlackWhite",
     0x0214: "ReferenceBlackWhite",
     0x1000: "RelatedImageFileFormat",
-    0x1001: "RelatedImageLength",
-    0x1001: "RelatedImageWidth",
+    0x1001: "RelatedImageLength",  # FIXME / Dictionary contains duplicate keys
+    0x1001: "RelatedImageWidth",   # FIXME \ Dictionary contains duplicate keys
     0x828d: "CFARepeatPatternDim",
     0x828e: "CFAPattern",
     0x828f: "BatteryLevel",

PIL/FliImagePlugin.py

@@ -105,7 +105,7 @@ def _palette(self, palette, shift):
                 g = i8(s[n+1]) << shift
                 b = i8(s[n+2]) << shift
                 palette[i] = (r, g, b)
-                i = i + 1
+                i += 1
 
     def seek(self, frame):
 

PIL/FontFile.py

@@ -30,7 +30,7 @@ def puti16(fp, values):
     # write network order (big-endian) 16-bit sequence
     for v in values:
         if v < 0:
-            v = v + 65536
+            v += 65536
         fp.write(_binary.o16be(v))
 
 ##
@@ -63,7 +63,7 @@ def compile(self):
                 h = max(h, src[3] - src[1])
                 w = w + (src[2] - src[0])
                 if w > WIDTH:
-                    lines = lines + 1
+                    lines += 1
                     w = (src[2] - src[0])
                 maxwidth = max(maxwidth, w)
 

PIL/FpxImagePlugin.py

@@ -84,7 +84,7 @@ def _open_index(self, index = 1):
         i = 1
         while size > 64:
             size = size / 2
-            i = i + 1
+            i += 1
         self.maxid = i - 1
 
         # mode.  instead of using a single field for this, flashpix

PIL/GimpGradientFile.py

@@ -68,7 +68,7 @@ def getpalette(self, entries = 256):
             x = i / float(entries-1)
 
             while x1 < x:
-                ix = ix + 1
+                ix += 1
                 x0, x1, xm, rgb0, rgb1, segment = self.gradient[ix]
 
             w = x1 - x0

PIL/GimpPaletteFile.py

@@ -52,7 +52,7 @@ def __init__(self, fp):
             if 0 <= i <= 255:
                 self.palette[i] = o8(v[0]) + o8(v[1]) + o8(v[2])
 
-            i = i + 1
+            i += 1
 
         self.palette = b"".join(self.palette)
 

PIL/IcnsImagePlugin.py

@@ -70,7 +70,7 @@ def read_32(fobj, start_length, size):
                 else:
                     blocksize = byte + 1
                     data.append(fobj.read(blocksize))
-                bytesleft = bytesleft - blocksize
+                bytesleft -= blocksize
                 if bytesleft <= 0:
                     break
             if bytesleft != 0:
@@ -179,11 +179,11 @@ def __init__(self, fobj):
         i = HEADERSIZE
         while i < filesize:
             sig, blocksize = nextheader(fobj)
-            i = i + HEADERSIZE
-            blocksize = blocksize - HEADERSIZE
+            i += HEADERSIZE
+            blocksize -= HEADERSIZE
             dct[sig] = (i, blocksize)
             fobj.seek(blocksize, 1)
-            i = i + blocksize
+            i += blocksize
 
     def itersizes(self):
         sizes = []

PIL/ImImagePlugin.py

@@ -182,7 +182,7 @@ def _open(self):
                     self.info[k] = v
 
                 if k in TAGS:
-                    n = n + 1
+                    n += 1
 
             else:
 

PIL/Image.py

@@ -434,9 +434,9 @@ def _getscaleoffset(expr):
     data = expr(_E(stub)).data
     try:
         (a, b, c) = data # simplified syntax
-        if (a is stub and b == "__mul__" and isinstance(c, numbers.Number)):
+        if a is stub and b == "__mul__" and isinstance(c, numbers.Number):
             return c, 0.0
-        if (a is stub and b == "__add__" and isinstance(c, numbers.Number)):
+        if a is stub and b == "__add__" and isinstance(c, numbers.Number):
             return 1.0, c
     except TypeError: pass
     try:
@@ -2002,7 +2002,6 @@ def frombuffer(mode, size, data, decoder_name="raw", *args):
 
     .. versionadded:: 1.1.4
     """
-    "Load image from bytes or buffer"
 
     # may pass tuple instead of argument list
     if len(args) == 1 and isinstance(args[0], tuple):

PIL/ImageFile.py

@@ -502,5 +502,5 @@ def _safe_read(fp, size):
         if not block:
             break
         data.append(block)
-        size = size - len(block)
+        size -= len(block)
     return b"".join(data)

PIL/ImageMath.py

@@ -17,7 +17,6 @@
 
 from PIL import Image
 from PIL import _imagingmath
-import sys
 
 try:
     import builtins

PIL/ImageOps.py

@@ -94,7 +94,7 @@ def autocontrast(image, cutoff=0, ignore=None):
                     cut = cut - h[lo]
                     h[lo] = 0
                 else:
-                    h[lo] = h[lo] - cut
+                    h[lo] -= cut
                     cut = 0
                 if cut <= 0:
                     break
@@ -105,7 +105,7 @@ def autocontrast(image, cutoff=0, ignore=None):
                     cut = cut - h[hi]
                     h[hi] = 0
                 else:
-                    h[hi] = h[hi] - cut
+                    h[hi] -= cut
                     cut = 0
                 if cut <= 0:
                     break

PIL/ImageShow.py

@@ -17,7 +17,7 @@
 from PIL import Image
 import os, sys
 
-if(sys.version_info >= (3, 3)):
+if sys.version_info >= (3, 3):
     from shlex import quote
 else:
     from pipes import quote
@@ -160,7 +160,7 @@ def get_command_ex(self, file, title=None, **options):
             # imagemagick's display command instead.
             command = executable = "xv"
             if title:
-                command = command + " -name %s" % quote(title)
+                command += " -name %s" % quote(title)
             return command, executable
 
     if which("xv"):

PIL/ImageStat.py

@@ -21,7 +21,6 @@
 # See the README file for information on usage and redistribution.
 #
 
-from PIL import Image
 import operator, math
 from functools import reduce
 
@@ -81,7 +80,7 @@ def _getsum(self):
         for i in range(0, len(self.h), 256):
             sum = 0.0
             for j in range(256):
-                sum = sum + j * self.h[i+j]
+                sum += j * self.h[i + j]
             v.append(sum)
         return v
 
@@ -92,7 +91,7 @@ def _getsum2(self):
         for i in range(0, len(self.h), 256):
             sum2 = 0.0
             for j in range(256):
-                sum2 = sum2 + (j ** 2) * float(self.h[i+j])
+                sum2 += (j ** 2) * float(self.h[i + j])
             v.append(sum2)
         return v
 

PIL/IptcImagePlugin.py

@@ -103,7 +103,7 @@ def _is_raw(self, offset, size):
                 break
             if s != sz:
                 return 0
-            y = y + 1
+            y += 1
         return y == size[1]
 
     def _open(self):
@@ -187,7 +187,7 @@ def load(self):
                 if not s:
                     break
                 o.write(s)
-                size = size - len(s)
+                size -= len(s)
         o.close()
 
         try:
@@ -235,26 +235,26 @@ def getiptcinfo(im):
                 # parse the image resource block
                 offset = 0
                 while app[offset:offset+4] == "8BIM":
-                    offset = offset + 4
+                    offset += 4
                     # resource code
                     code = JpegImagePlugin.i16(app, offset)
-                    offset = offset + 2
+                    offset += 2
                     # resource name (usually empty)
                     name_len = i8(app[offset])
                     name = app[offset+1:offset+1+name_len]
                     offset = 1 + offset + name_len
                     if offset & 1:
-                        offset = offset + 1
+                        offset += 1
                     # resource data block
                     size = JpegImagePlugin.i32(app, offset)
-                    offset = offset + 4
+                    offset += 4
                     if code == 0x0404:
                         # 0x0404 contains IPTC/NAA data
                         data = app[offset:offset+size]
                         break
                     offset = offset + size
                     if offset & 1:
-                        offset = offset + 1
+                        offset += 1
         except (AttributeError, KeyError):
             pass
 

PIL/Jpeg2KImagePlugin.py

@@ -15,7 +15,7 @@
 
 __version__ = "0.1"
 
-from PIL import Image, ImageFile, _binary
+from PIL import Image, ImageFile
 import struct
 import os
 import io

PIL/JpegImagePlugin.py

@@ -543,8 +543,8 @@ def validate_qtables(qtables):
         i = 1
         for marker in markers:
             size = struct.pack(">H", 2 + ICC_OVERHEAD_LEN + len(marker))
-            extra = extra + (b"\xFF\xE2" + size + b"ICC_PROFILE\0" + o8(i) + o8(len(markers)) + marker)
-            i = i + 1
+            extra += b"\xFF\xE2" + size + b"ICC_PROFILE\0" + o8(i) + o8(len(markers)) + marker
+            i += 1
 
     # get keyword arguments
     im.encoderconfig = (

PIL/MpegImagePlugin.py

@@ -38,13 +38,13 @@ def peek(self, bits):
                 self.bits = 0
                 continue
             self.bitbuffer = (self.bitbuffer << 8) + c
-            self.bits = self.bits + 8
+            self.bits += 8
         return self.bitbuffer >> (self.bits - bits) & (1 << bits) - 1
 
     def skip(self, bits):
         while self.bits < bits:
             self.bitbuffer = (self.bitbuffer << 8) + i8(self.fp.read(1))
-            self.bits = self.bits + 8
+            self.bits += 8
         self.bits = self.bits - bits
 
     def read(self, bits):

PIL/PalmImagePlugin.py

@@ -172,21 +172,21 @@ def _save(im, fp, filename, check=0):
     cols = im.size[0]
     rows = im.size[1]
 
-    rowbytes = ((cols + (16//bpp - 1)) / (16 // bpp)) * 2;
+    rowbytes = ((cols + (16//bpp - 1)) / (16 // bpp)) * 2
     transparent_index = 0
     compression_type = _COMPRESSION_TYPES["none"]
 
-    flags = 0;
+    flags = 0
     if im.mode == "P" and "custom-colormap" in im.info:
         flags = flags & _FLAGS["custom-colormap"]
-        colormapsize = 4 * 256 + 2;
+        colormapsize = 4 * 256 + 2
         colormapmode = im.palette.mode
         colormap = im.getdata().getpalette()
     else:
         colormapsize = 0
 
     if "offset" in im.info:
-        offset = (rowbytes * rows + 16 + 3 + colormapsize) // 4;
+        offset = (rowbytes * rows + 16 + 3 + colormapsize) // 4
     else:
         offset = 0
 

PIL/PcxImagePlugin.py

@@ -135,7 +135,7 @@ def _save(im, fp, filename, check=0):
     # bytes per plane
     stride = (im.size[0] * bits + 7) // 8
     # stride should be even
-    stride = stride + (stride % 2)
+    stride += stride % 2
     # Stride needs to be kept in sync with the PcxEncode.c version.
     # Ideally it should be passed in in the state, but the bytes value
     # gets overwritten. 

PIL/PdfImagePlugin.py

@@ -104,8 +104,8 @@ def write(self, value):
             r = i8(palette[i*3])
             g = i8(palette[i*3+1])
             b = i8(palette[i*3+2])
-            colorspace = colorspace + "%02x%02x%02x " % (r, g, b)
-        colorspace = colorspace + b"> ]"
+            colorspace += "%02x%02x%02x " % (r, g, b)
+        colorspace += b"> ]"
         procset = "/ImageI" # indexed color
     elif im.mode == "RGB":
         filter = "/DCTDecode"