Python统计多个Powerpoint文件中幻灯片总数量_python-pptx slides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 win32com.client

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，原文参见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 randrange

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 result

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)