Adding functions examples file

This is just an extra demo file.

functions_play.py

@@ -0,0 +1,19 @@
+'''
+This is a file full of functions examples.
+'''
+
+def calculate_bmi(height, weight, units="standard"):
+    '''
+    This function calculates BMI and returns the value. It expects height in inches and weight in pounds.
+    Change units to metric if metric. Then input KG and Meters.
+    '''
+
+    if units == "standard":
+        bmi = (weight/(height*height))*703
+    else:
+        bmi = weight/(height*height)
+    return bmi
+
+print("standard case: ",calculate_bmi(62,138))
+
+print("metric case: ",calculate_bmi(1.575,62.596,"metric"))