Create return_rate.py

return_rate.py

@@ -0,0 +1,29 @@
+import csv
+with open('test.csv', 'rb') as csvfile:
+    spamreader = csv.reader(csvfile, delimiter=',', quotechar='|')
+    inputs = []
+    year = -1
+    for row in spamreader:
+        inputs.append(row)
+        year += 1
+
+inputs = inputs[1:-1]
+output = float(inputs[-1][2])
+
+x = 0.2 # assume the return is 20% then if it's too large then x goes down or goes up
+while True:
+    y = 0
+    for i in inputs:
+        length = year - int(i[0])
+        cash = float(i[1])
+        value = float(i[2])
+        y += cash*(1+x)**(year)
+    if abs(y - output) > 10: # 10$ for estamate
+        if y > output:
+            x -= 0.001
+        else:
+            x += 0.001
+    else:
+        # print x, output, y
+        break
+print x