diff --git a/GemmaM0_Clockwork_Goggles/gemma_m0_clockwork_goggles.py b/GemmaM0_Clockwork_Goggles/gemma_m0_clockwork_goggles.py
index 3e9357ea..c0a7c3b5 100644
--- a/GemmaM0_Clockwork_Goggles/gemma_m0_clockwork_goggles.py
+++ b/GemmaM0_Clockwork_Goggles/gemma_m0_clockwork_goggles.py
@@ -31,11 +31,11 @@ def cog(pos):
     if (pos < 8) or (pos > 250):
         # return (120, 0, 0, 0) #first color, red: for RGBW NeoPixels
         return (120, 0, 0)  # first color, red: for RGB NeoPixels
-    if (pos < 85):
+    if pos < 85:
         return (int(pos * 3), int(255 - (pos * 3)), 0)
         # return (125, 35, 0, 0) #second color, brass: for RGBW NeoPixels
-        return (125, 35, 0)  # second color, brass: for RGB NeoPixels
-    elif (pos < 170):
+        # return (125, 35, 0)  # second color, brass: for RGB NeoPixels
+    elif pos < 170:
         pos -= 85
         # return (int(255 - pos*3), 0, int(pos*3), 0)#: for RGBW NeoPixels
         return (int(255 - pos * 3), 0, int(pos * 3))  # : for RGB NeoPixels
diff --git a/Gemma_Firewalker_Lite_Sneakers/Gemma_Firewalker_Lite_Sneakers.py b/Gemma_Firewalker_Lite_Sneakers/Gemma_Firewalker_Lite_Sneakers.py
index 14fbe57c..0fa0c2b1 100644
--- a/Gemma_Firewalker_Lite_Sneakers/Gemma_Firewalker_Lite_Sneakers.py
+++ b/Gemma_Firewalker_Lite_Sneakers/Gemma_Firewalker_Lite_Sneakers.py
@@ -85,19 +85,16 @@ gammas = [
     215, 218, 220, 223, 225, 228, 231, 233, 236, 239, 241, 244, 247, 249, 252, 255]
 
 
-def h2rgb(hue):
-    # return value
-    ret = 0
+def h2rgb(colour_hue):
+    colour_hue %= 90
+    h = hue_table[colour_hue >> 1]
 
-    hue %= 90
-    h = hue_table[hue >> 1]
-
-    if hue & 1:
+    if colour_hue & 1:
         ret = h & 15
     else:
         ret = (h >> 4)
 
-    return (ret * 17)
+    return ret * 17
 
 
 def wave_setup():
@@ -108,11 +105,11 @@ def wave_setup():
             [0, 7, 30, 0, 0, 0, 0, 0]]
 
     # assign random starting colors to waves
-    for w in range(n_waves):
-        wave[w][hue] = wave[w][hue_target] = 90 + random.randint(0, 90)
-        wave[w][red] = h2rgb(wave[w][hue] - 30)
-        wave[w][green] = h2rgb(wave[w][hue])
-        wave[w][blue] = h2rgb(wave[w][hue] + 30)
+    for wave_index in range(n_waves):
+        wave[wave_index][hue] = wave[wave_index][hue_target] = 90 + random.randint(0, 90)
+        wave[wave_index][red] = h2rgb(wave[wave_index][hue] - 30)
+        wave[wave_index][green] = h2rgb(wave[wave_index][hue])
+        wave[wave_index][blue] = h2rgb(wave[wave_index][hue] + 30)
 
 
 def vibration_detector():
@@ -124,7 +121,7 @@ def vibration_detector():
 while True:
 
     # wait for vibration sensor to trigger
-    if ramping_up == False:
+    if not ramping_up:
         ramping_up = vibration_detector()
         wave_setup()
 
@@ -150,7 +147,7 @@ while True:
         if wave[w][hue] == wave[w][hue_target]:
 
             # There's a tiny random chance of picking a new hue...
-            if (not random.randint(frames_per_second * 4, 255)):
+            if not random.randint(frames_per_second * 4, 255):
                 # Within 1/3 color wheel
                 wave[w][hue_target] = random.randint(
                     wave[w][hue] - 30, wave[w][hue] + 30)
diff --git a/Gemma_Hoop_Earrings/Gemma_Hoop_Earrings.py b/Gemma_Hoop_Earrings/Gemma_Hoop_Earrings.py
index b7c3d0f4..ef048b94 100644
--- a/Gemma_Hoop_Earrings/Gemma_Hoop_Earrings.py
+++ b/Gemma_Hoop_Earrings/Gemma_Hoop_Earrings.py
@@ -21,9 +21,9 @@ def wheel(pos):
     # The colours are a transition r - g - b - back to r.
     if (pos < 0) or (pos > 255):
         return [0, 0, 0]
-    elif (pos < 85):
+    elif pos < 85:
         return [int(pos * 3), int(255 - (pos * 3)), 0]
-    elif (pos < 170):
+    elif pos < 170:
         pos -= 85
         return [int(255 - pos * 3), 0, int(pos * 3)]
     else:
diff --git a/Gemma_LightTouch/gemma_lighttouch.py b/Gemma_LightTouch/gemma_lighttouch.py
index d92d753b..edb899a7 100644
--- a/Gemma_LightTouch/gemma_lighttouch.py
+++ b/Gemma_LightTouch/gemma_lighttouch.py
@@ -34,10 +34,10 @@ def cycle_sequence(seq):
 
 def rainbow_cycle(seq):
     """Rainbow cycle generator"""
-    rainbow = cycle_sequence(seq)
+    rainbow_sequence = cycle_sequence(seq)
     while True:
         # pylint: disable=stop-iteration-return
-        led[0] = (wheel(next(rainbow)))
+        led[0] = (wheel(next(rainbow_sequence)))
         yield
 
 
diff --git a/Introducing_CircuitPlaygroundExpress/CircuitPlaygroundExpress_HIDKeyboard.py b/Introducing_CircuitPlaygroundExpress/CircuitPlaygroundExpress_HIDKeyboard.py
index 1f8afd47..5d4273d8 100644
--- a/Introducing_CircuitPlaygroundExpress/CircuitPlaygroundExpress_HIDKeyboard.py
+++ b/Introducing_CircuitPlaygroundExpress/CircuitPlaygroundExpress_HIDKeyboard.py
@@ -54,7 +54,7 @@ while True:
                 pass  # wait for it to be released!
             # type the keycode or string
             k = buttonkeys[i]  # get the corresp. keycode/str
-            if type(k) is str:
+            if isinstance(k, str):
                 layout.write(k)
             else:
                 kbd.press(controlkey, k)  # press...