How to split PDF documents using PyPDF2 module in Python

Install PyPDF2 module

# This module is strictly case-sensitive, y is lowercase, and the rest is uppercase

pip3 install PyPDF2

After the installation is completed, create a folder specifically to store this project on the local hard disk. The storage path here is F:\Python\PyPDF2. There is a Python folder on the F drive, and I created it in it. A folder named after this module to store it separately and distinguish it from other projects.

Create files and prepare PDF documents

Looking for a larger PDF document for practice, I downloaded it from the Django official website This document is large enough, with more than 1,900 pages, which is definitely enough for practicing. If necessary, go to the official website to download, or directly reply 'pdf' on my official account to get the download link, and then create a PDFCF.py project file .

Start writing

The program starts with two lines and writes the two sentences above and below. The first sentence means to specify the running program of this file. The second sentence This sentence is a description of this file. The function of this cannot be seen yet, but if you know how to quickly execute programs in batches, you will know its function. I will not go into details here.

#! python# PDFCF.py - pdf文件拆分程序

The idea of ​​document splitting

It is not fixed how many parts it is split into, but it is fixed how many pages each part consists of , and then dynamically calculate the number of splits. Once you have the idea of ​​splitting, the next step is to list the calculation formula.

拆分的份数= 文档总页数 / 拆份每个pdf组成的页数

For example:

If we want to split a pdf document with a total of 35 pages, it will be composed of 10 pages each For a new document, the calculation formula for how many parts it can be split into is as follows:

3.5 = 35 / 10

At this time, everyone pays attention. If the remainder is 0.5, what does it mean? Using this example, it means that there are 5 pages left after splitting into 3 parts. In this case, no matter what the remainder is, you have to move forward by 1 to complete the entire split. The result of this document split is that the first 3 documents Each document consists of 10 pages, and the fourth document consists of the last 5 pages. If it is divisible, the result is directly the number of split copies.

Python split calculation formula:

if 35 % 10:   # 判断是否有余数  35 // 10 + 1   # 取余数整数部分加1else:  0         # 能整除则直接返回0  # 将这个循环写到一行4 = 35 // 10 + 1 if 35 % 10 else 0

How to split it specifically?

Let’s take this 35-page document split as an example:

Loop through each page of data for num in range(35), get the data of each page, and then specify the split page range to split:

1. The first document starts from 0- -10, excluding 10

2. The second document is from 10--20, excluding 20

3. The third document is from 20 - 30, not including 30

4. The fourth document is from 30--35, not including 35

We found the pattern, each time we traverse the The rule of a number is the number of pages in a document, which can be obtained by multiplying the number it belongs to. We found that there is no pattern in the second number. In fact, there is a pattern if we observe carefully. If we sort the number of splits, this example is 1--4. The second number is the current number of splits multiplied by each The number of pages the document consists of (the number of pages is fixed at 10).

But when we traverse for the first time, we start from 0, which makes num unusable. Then we modify it and start traversing from 1, range(1,35), traverse from the beginning, based on the range is not Contains the last characteristic of itself, so that one page of documents will be missing after traversing, then we add 1 to it and become

1. for num in range(1,35 1 )

2. The first document starts from 10*(1-1)--10*1, excluding 10

3. The two documents are from 10*(2-1)--10*2, not including 20

4. The third document is from 10*(3-1)-10*3, not The fourth document containing 30

5. ## is from 10(4-1)--35

The specific traversal code is as follows:

for num in range(1,35+1):  pass  for i in range(10 * (num-1), 10 * num if num != 4 else 35):    pass

Note: When traversing to num = 4 (the last document sort number), just return the total number of pages 35, and the traversal ends here. . Why is the total number of pages here 35 instead of 35 1? This is because we are traversing from 0 this time, and the page number starts from 0, so there is no need to add 1.

Complete splitting procedure:

import PyPDF2

Note: I personally feel that the splitting idea above is a bit convoluted. If you are interested in If you have a thorough understanding of the concepts of edge trimming and step size in Python lists, I don’t think it needs to be so complicated. You only need to generate a large list of the total page numbers, and then split the list into multiple small lists using the slicing method, and then split each list. The divided pdf page number range is the first number of each small list - the last number 1. I also posted the code I implemented using the list method for your reference.

Split list method to split PDF:

#! python

How to use?

Hold down the Shift key inside the project folder, right-click the mouse, choose to open the command window here, enter PDFCF.py, and press Enter to change it according to your needs The value of n.

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