任意整数的几何级数

Author: aaronwawa

Diff for: Homework/Aaronwa/lz_episode_01/geometric_progression.png

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+#!/usr/bin/env python
+# encoding: utf-8
+# @Time    : 2019/5/814:42
+
+__author__ = 'aaronwa'
+
+def geometricprogression(a, q, n):
+    if q == 1:
+        sn = a * n
+    else:
+        sn = int(a*(q**n-1)/(q-1))
+    print (sn)
+geometricprogression(2, 3, 4)