Python统计多个Powerpoint文件中幻灯片总数量

晚上吃饭时突然想知道自己做了多少页《Python程序设计》系列教材的配套PPT，于是就有了下面的代码，这套PPT综合了《Python程序设计基础》（ISBN：9787302410584）、《Python程序设计（第2版）》（ISBN：9787302436515）和《Python可以这样学》（ISBN：9787302456469）以及将要出版的《Python程序设计开发宝典》4本书的内容，部分内容比书上详细，有的地方不如书上详细，主要是上课用，几本书重点介绍Python 3.4.x、3.5.x、3.6.x的语法和应用，全套课件均已免费分享。

import os
import os.path
import win32com
import
total = 0
def pptCount(path):
     global total
     for subPath  in os.listdir(path):
         subPath = os.path.join(path, subPath)
         if os.path.isdir(subPath):
             pptCount(subPath)
         elif subPath.endswith('.ppt'):
             print(subPath)
             powerpoint = win32com.client.Dispatch('PowerPoint.Application')
             powerpoint.Visible = 1
             ppt = powerpoint.Presentations.Open(subPath)
             win32com.client.gencache.EnsureDispatch('PowerPoint.Application')
             total += ppt.Slides.Count
             powerpoint.Quit()
pptCount('F:\\教学课件\\Python程序设计（第二版）')
print(total)

运行结果显示：

pptx肿么办？

首先：

pip install python-pptx

然后：

>>> import pptx
 >>> p = pptx.Presentation('f:\\1.pptx')
 >>> len(p.slides)
 3

另外，关于昨天发的文章再补充一下，参见Python计算序列中数字最大差值（美团2016校招笔试题）

昨天发文之后立刻有上海交大李老师和读者朋友zhouyonghaha指出算法效率太低，其实一次循环就可以，开始我还不太明白，想了一下果然如此，于是有了下面的高效代码，算作一个补充：

from random import

def  maxDifference2(lst):
     diff = -float('inf')    
     minCurrent = lst[0]    
     for value  in lst[1:]:
         if value < minCurrent:
             minCurrent = value
         else:
             t = value-minCurrent
             if t > diff:
                 diff = t
                 result = (minCurrent, value)
     return
for _  in range(10):
     print('='*20)
     lst = [randrange(1,100) for _  in range(20)]
     print(lst)
     print(maxDifference2(lst))

运行结果显示：

====================
 [22, 20, 32, 66, 22, 74, 74, 31, 88, 94, 18, 35, 47, 75, 14, 83, 44, 57, 53, 95]
 (14, 95)
 ====================
 [60, 15, 46, 36, 93, 45, 92, 56, 36, 57, 87, 80, 47, 4, 72, 18, 79, 32, 35, 1]
 (15, 93)
 ====================
 [4, 40, 92, 99, 87, 14, 52, 55, 35, 52, 1, 53, 50, 46, 39, 53, 29, 8, 45, 32]
 (4, 99)
 ====================
 [41, 53, 52, 47, 93, 67, 18, 38, 77, 12, 87, 42, 43, 2, 16, 32, 20, 54, 33, 72]
 (12, 87)
 ====================
 [68, 41, 29, 33, 23, 81, 5, 41, 17, 54, 69, 29, 90, 10, 57, 88, 14, 30, 69, 81]
 (5, 90)
 ====================
 [1, 46, 27, 47, 68, 44, 89, 15, 2, 10, 32, 90, 45, 79, 33, 99, 21, 61, 79, 21]
 (1, 99)
 ====================
 [64, 58, 97, 65, 15, 13, 35, 86, 25, 58, 26, 51, 65, 14, 6, 98, 90, 25, 98, 42]
 (6, 98)
 ====================
 [55, 14, 18, 57, 40, 27, 55, 93, 21, 16, 48, 32, 93, 69, 50, 13, 89, 98, 59, 40]
 (13, 98)
 ====================
 [11, 19, 17, 96, 21, 25, 74, 71, 78, 8, 49, 58, 57, 36, 72, 56, 83, 93, 41, 65]
 (11, 96)
 ====================
 [48, 95, 56, 44, 42, 40, 83, 86, 82, 50, 73, 88, 98, 52, 28, 60, 33, 17, 68, 59]
 (40, 98)