Python之利用PyPDF2库实现对PDF的删除和合并

概述

PyPDF2是Python中用于对PDF操作的第三方库，提供了删除、合并、裁剪、转换等操作
最主要有四个类：
The PdfFileReader Class
The PdfFileMerger Class
The PageObject Class
The PdfFileWriter Class

安装

打开命令行键入

pip install PyPDF2

一、The PdfFileReader Class

 PyPDF2.PdfFileReader(stream, strict=True, warndest=None, overwriteWarnings=True)

Parameters:
stream – A File object or an object that supports the standard read and seek methods similar to a File object. Could also be a string representing a path to a PDF file.

strict (bool) – Determines whether user should be warned of all problems and also causes some correctable problems to be fatal. Defaults to True.

warndest – Destination for logging warnings (defaults to sys.stderr).

overwriteWarnings (bool) – Determines whether to override Python’s warnings.py module with a custom implementation (defaults to True).

1、getNumPages()

Calculates the number of pages in this PDF file.

Returns: number of pages
Return type: int
Raises PdfReadError:
if file is encrypted and restrictions prevent this action.

2、getPage(pageNumber)

Retrieves a page by number from this PDF file.

Parameters: pageNumber (int)
– The page number to retrieve (pages begin at zero)
Returns: a PageObject instance.
Return type: PageObject

二、The PdfFileWriter Class

class PyPDF2.PdfFileWriter
This class supports writing PDF files out, given pages produced by another class (typically PdfFileReader).

1、addPage(page)

Adds a page to this PDF file. The page is usually acquired from a PdfFileReader instance.

Parameters: page (PageObject) – The page to add to the document. Should be an instance of PageObject

2、write(stream)

Writes the collection of pages added to this object out as a PDF file.

Parameters: stream – An ob