Update lesson_7.py

************* Module lesson_7
lessons/lesson_7/lesson_7.py:89:0: C0301: Line too long (113/100) (line-too-long)
lessons/lesson_7/lesson_7.py:57:4: C0206: Consider iterating with .items() (consider-using-dict-items)
lessons/lesson_7/lesson_7.py:50:0: R1710: Either all return statements in a function should return an expression, or none of them should. (inconsistent-return-statements)

lessons/lesson_7/lesson_7.py

@@ -9,8 +9,8 @@
 micropython using a potentiometer and the analog read function. This class is
 for absolute beginners, and I do not assume you already understand the material
 I am presenting. My goal is not to 'Show Off', but to genuinely teach you how
-you can do this type of work and projects on your own. I will show all work step-by-step,
-with clear instructions.
+you can do this type of work and projects on your own. I will show all work
+step-by-step, with clear instructions.
 Enjoy!
 """
 
@@ -42,7 +42,7 @@ def all_led_off():
     Turns all leds off
     :return:
     """
-    for color in COLORS:
+    for color in COLORS.keys():
         pin = Pin(Pins[color], Pin.OUT)
         pin.value(0)
 
@@ -54,9 +54,14 @@ def value_to_color(v_value):
     :param v_value:
     :return:
     """
-    for color in COLORS:
+    new_color = ''
+
+    for color in COLORS.keys():
         if v_value in COLORS[color]:
-            return color
+            new_color = color
+            break
+
+    return new_color
 
 
 def turn_led_on(color):
@@ -86,7 +91,8 @@ def converter(read_value):
     while True:
         all_led_off()                                # Turn off all LEDs
         v = potentiometer.read_u16()                 # Read potentiometer value -> v
-        value = converter(v)                         # Convert potentiometer value into integer between 0 and 100
+        # Convert potentiometer value into integer between 0 and 100
+        value = converter(v)
         led_color = value_to_color(value)            # Get color based on converted value
         turn_led_on(led_color)                       # Turn ON corresponding LED
         print(f'value: {value}, LED: {led_color}')   # DEBUG output