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module3_wrapup.py

+## module 3, example - not needing selection statement
+
+x = 5 
+
+# I want to make sure that x is not smaller than 0
+
+# One way of achieving this:
+if x<0:
+    x = 0
+
+# A better way of achieving the same:  
+x  = max(x,0) 
+
+
+#%% module 3, example - short-circuit operators
+
+name = 'Vedrana'
+
+# I want to check if the name starts with 'Ved'. But what if name has less than
+# 3 letters? I need to make sure that name[:3] is not evaluated if name is too 
+# short. I add the first condition and the second condition will not be
+# evaluated if the first is false.
+
+if len(name)>2 and name[:3]=='Ved':
+    print('Cool')
+    
+
+#%% module 3, example -- an extra condition
+    
+x = 4
+
+# I want to check whethr x is bigger than 5
+
+# A bad way of achieving this:
+if x>5:
+    print('Bigger than 5')
+elif x<=5:
+    print('Smaller or equal 5')
+
+# A better way of achieving this:
+if x>5:
+    print('Bigger than 5')
+else:  
+    print('Smaller or equal 5')    
+    
+#%% module 3, example -- nothing to fall to
+
+# Make sure that return value is assigned in the function call
+
+def give_verdict(x):
+    x = ''
+    if x>0:
+        verdict = 'Bigger than 0'
+    elif x<0: 
+        verdict = 'Smaller than 0'
+    return verdict
+
+print(give_verdict(0))
+
+
+#%% module 3, example -- using boolean flags
+
+is_rgb = False
+
+if is_rgb: # dont write "if is_rgb==True"
+    print('special treatment for color images')
+else:
+    print('no special treatment')
+    
+    
+#%% module 3, example -- debugging, line by line
+
+x = 41.7
+
+if x > 137/4:
+    x = 2*x + 154/18
+elif x< 117/4:
+    x = x + 154/18
+    
+    
+    
+
+    
+
+
+