Merge pull request #70 from lironmiz/unit5-Ex5.3.6

Create unit5_Ex5.3.6.py

Author: lironmiz

Diff for: unit5_Ex5.3.6.py

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+# exercise 5.3.6 from unit 5
+
+'''
+Write a function called filter_teens defined as follows:
+
+def filter_teens(a, b, c):
+The function receives three values representing ages: a, b, c and returns their sum.
+
+Guidelines
+If the function is called with no parameters, the default value of each age is 13.
+If one of the values represents the age of teenagers between 13 and 19 (including them)
+but excluding the ages 15 and 16 - adjust its value using the function described below,
+so that it is calculated as 0.
+
+Write a helper function fix_age defined as follows:
+def fix_age(age):
+The function receives a number that represents an age and returns it corrected 
+according to the rules above. Call the fix_age function from within the filter_teens
+function so that you don't repeat the age correction code three times.
+
+Running examples of the filter_teens function
+
+>>> filter_teens()
+0
+>>> filter_teens(1, 2, 3)
+6
+>>> filter_teens(2, 13, 1)
+3
+>>> filter_teens(2, 1, 15)
+18
+'''
+def fix_age(age):
+    if age >= 13 and age <= 19 and age not in (15, 16):
+        return 0
+    return age
+
+
+def filter_teens(a=13, b=13, c=13):
+    a = fix_age(a)
+    b = fix_age(b)
+    c = fix_age(c)
+    return a + b + c
+
+print(filter_teens())  # 0
+print(filter_teens(1, 2, 3))  # 6
+print(filter_teens(2, 1, 15))  # 18
+  
+