use yield from instead of explicit version

pysstv/color.py

@@ -16,14 +16,12 @@ class ColorSSTV(GrayscaleSSTV):
         msec_pixel = self.SCAN / self.WIDTH
         image = self.pixels
         for index in self.COLOR_SEQ:
-            for item in self.before_channel(index):
-                yield item
+            yield from self.before_channel(index)
             for col in range(self.WIDTH):
                 pixel = image[col, line]
                 freq_pixel = byte_to_freq(pixel[index])
                 yield freq_pixel, msec_pixel
-            for item in self.after_channel(index):
-                yield item
+            yield from self.after_channel(index)
 
     def before_channel(self, index):
         return []
@@ -65,8 +63,7 @@ class ScottieS1(MartinM1):
 
     def before_channel(self, index):
         if index == RED:
-            for item in MartinM1.horizontal_sync(self):
-                yield item
+            yield from MartinM1.horizontal_sync(self)
         yield FREQ_BLACK, self.INTER_CH_GAP
 
 
@@ -159,8 +156,7 @@ class PD90(ColorSSTV):
     def gen_image_tuples(self):
         yuv = self.image.convert('YCbCr').load()
         for line in range(0, self.HEIGHT, 2):
-            for item in self.horizontal_sync():
-                yield item
+            yield from self.horizontal_sync()
             yield FREQ_BLACK, self.PORCH
             pixels0 = [yuv[col, line] for col in range(self.WIDTH)]
             pixels1 = [yuv[col, line + 1] for col in range(self.WIDTH)]

pysstv/grayscale.py

@@ -10,10 +10,8 @@ class GrayscaleSSTV(SSTV):
 
     def gen_image_tuples(self):
         for line in range(self.HEIGHT):
-            for item in self.horizontal_sync():
-                yield item
-            for item in self.encode_line(line):
-                yield item
+            yield from self.horizontal_sync()
+            yield from self.encode_line(line)
 
     def encode_line(self, line):
         msec_pixel = self.SCAN / self.WIDTH

pysstv/sstv.py

@@ -113,8 +113,7 @@ class SSTV(object):
         parity_freq = FREQ_VIS_BIT1 if num_ones % 2 == 1 else FREQ_VIS_BIT0
         yield parity_freq, MSEC_VIS_BIT
         yield FREQ_SYNC, MSEC_VIS_BIT  # stop bit
-        for freq_tuple in self.gen_image_tuples():
-            yield freq_tuple
+        yield from self.gen_image_tuples()
         for fskid_byte in map(ord, self.fskid_payload):
             for _ in range(6):
                 bit = fskid_byte & 1