A-M baby

Task/Jensens-Device/Python/jensens-device.py

@@ -0,0 +1,18 @@
+class Ref(object):
+    def __init__(self, value=None):
+        self.value = value
+
+def harmonic_sum(i, lo, hi, term):
+    # term is passed by-name, and so is i
+    temp = 0
+    i.value = lo
+    while i.value <= hi:  # Python "for" loop creates a distinct which
+        temp += term() # would not be shared with the passed "i"
+        i.value += 1   # Here the actual passed "i" is incremented.
+    return temp
+
+i = Ref()
+
+# note the correspondence between the mathematical notation and the
+# call to sum it's almost as good as sum(1/i for i in range(1,101))
+print harmonic_sum(i, 1, 100, lambda: 1.0/i.value)