Don't use with statements in examples

Also tidy up line spacing

gpiozero/tools.py

@@ -108,7 +108,9 @@ def clamped(values, output_min=0, output_max=1):
 
         led = PWMLED(4)
         pot = MCP3008(channel=0)
+        
         led.source = clamped(pot.values, 0.5, 1.0)
+        
         pause()
     """
     if output_min >= output_max:
@@ -129,8 +131,10 @@ def absoluted(values):
         led = PWMLED(4)
         motor = Motor(22, 27)
         pot = MCP3008(channel=0)
+        
         motor.source = scaled(pot.values, -1, 1)
         led.source = absoluted(motor.values)
+        
         pause()
     """
     for v in values:
@@ -283,7 +287,9 @@ def averaged(*values):
         pot2 = MCP3008(channel=1)
         pot3 = MCP3008(channel=2)
         led = PWMLED(4)
+        
         led.source = averaged(pot1.values, pot2.values, pot3.values)
+        
         pause()
     """
     for v in zip(*values):
@@ -304,7 +310,9 @@ def summed(*values):
         pot2 = MCP3008(channel=1)
         pot3 = MCP3008(channel=2)
         led = PWMLED(4)
+
         led.source = scaled(summed(pot1.values, pot2.values, pot3.values), 0, 1, 0, 3)
+        
         pause()
     """
     for v in zip(*values):
@@ -326,7 +334,9 @@ def multiplied(*values):
         pot2 = MCP3008(channel=1)
         pot3 = MCP3008(channel=2)
         led = PWMLED(4)
+        
         led.source = multiplied(pot1.values, pot2.values, pot3.values)
+        
         pause()
     """
     def _product(it):
@@ -350,10 +360,13 @@ def queued(values, qsize):
 
         leds = LEDBoard(5, 6, 13, 19, 26)
         btn = Button(17)
+        
         for i in range(4):
             leds[i].source = queued(leds[i + 1].values, 5)
             leds[i].source_delay = 0.01
+            
         leds[4].source = btn.values
+        
         pause()
     """
     if qsize < 1:
@@ -381,9 +394,10 @@ def smoothed(values, qsize, average=mean):
         from gpiozero import MCP3008
         from gpiozero.tools import smoothed
 
-        with MCP3008(channel=0) as adc:
-            for value in smoothed(adc.values, 5):
-                print(value)
+        adc = MCP3008(channel=0)
+        
+        for value in smoothed(adc.values, 5):
+            print(value)
     """
     if qsize < 1:
         raise ValueError("qsize must be 1 or larger")
@@ -430,18 +444,20 @@ def pre_periodic_filtered(values, block, repeat_after):
         from gpiozero import MCP3008
         from gpiozero.tools import pre_periodic_filtered
 
-        with MCP3008(channel=0) as adc:
-            for value in pre_periodic_filtered(adc.values, 50, 0):
-                print(value)
+        adc = MCP3008(channel=0)
+        
+        for value in pre_periodic_filtered(adc.values, 50, 0):
+            print(value)
 
     Or to only display every even item read from an ADC::
 
         from gpiozero import MCP3008
         from gpiozero.tools import pre_periodic_filtered
 
-        with MCP3008(channel=0) as adc:
-            for value in pre_periodic_filtered(adc.values, 1, 1):
-                print(value)
+        adc = MCP3008(channel=0)
+        
+        for value in pre_periodic_filtered(adc.values, 1, 1):
+            print(value)
     """
     if block < 1:
         raise ValueError("block must be 1 or larger")
@@ -470,9 +486,10 @@ def post_periodic_filtered(values, repeat_after, block):
         from gpiozero import MCP3008
         from gpiozero.tools import post_periodic_filtered
 
-        with MCP3008(channel=0) as adc:
-            for value in post_periodic_filtered(adc.values, 9, 1):
-                print(value)
+        adc = MCP3008(channel=0)
+        
+        for value in post_periodic_filtered(adc.values, 9, 1):
+            print(value)
     """
     if repeat_after < 1:
         raise ValueError("repeat_after must be 1 or larger")
@@ -496,7 +513,9 @@ def random_values():
         from signal import pause
 
         led = PWMLED(4)
+        
         led.source = random_values()
+        
         pause()
 
     If you require a wider range than 0 to 1, see :func:`scaled`.
@@ -517,10 +536,12 @@ def sin_values(period=360):
 
         red = PWMLED(2)
         blue = PWMLED(3)
+        
         red.source_delay = 0.01
         blue.source_delay = red.source_delay
         red.source = scaled(sin_values(100), 0, 1, -1, 1)
         blue.source = inverted(red.values)
+        
         pause()
 
     If you require a different range than -1 to +1, see :func:`scaled`.
@@ -542,10 +563,12 @@ def cos_values(period=360):
 
         red = PWMLED(2)
         blue = PWMLED(3)
+        
         red.source_delay = 0.01
         blue.source_delay = red.source_delay
         red.source = scaled(cos_values(100), 0, 1, -1, 1)
         blue.source = inverted(red.values)
+        
         pause()
 
     If you require a different range than -1 to +1, see :func:`scaled`.
@@ -553,4 +576,3 @@ def cos_values(period=360):
     angles = (2 * pi * i / period for i in range(period))
     for a in cycle(angles):
         yield cos(a)
-