Question

所以我试图从一些PDF中获取一些特定的文本，并且我使用Python和PDFMiner但由于{{3}中发生的API更改而遇到一些问题}。基本上，为了从PDF中获取我想要的文本部分，我目前必须将整个文件转换为文本，然后使用字符串函数来获取我想要的部分。我想要做的是遍历PDF的每一页，并逐一将每一页转换为文本。然后，一旦我找到了我想要的部分，我就会阻止它阅读PDF文件。

我会发布我的文本编辑器中的代码，但它不是工作版本，而是中途到效率的中途-solution版本：P

#!/usr/bin/env python
# -*- coding: utf-8 -*- 

from pdfminer.pdfparser import PDFParser
from pdfminer.pdfdocument import PDFDocument
from pdfminer.pdfpage import PDFPage
from pdfminer.pdfinterp import PDFResourceManager
from pdfminer.pdfinterp import PDFPageInterpreter
from pdfminer.pdfdevice import PDFDevice
from pdfminer.converter import LTChar, TextConverter
from pdfminer.layout import LAParams
from subprocess import call
from cStringIO import StringIO
import re
import sys
import os

argNum = len(sys.argv)
pdfLoc = str(sys.argv[1]) #CLI arguments

def convert_pdf_to_txt(path): #converts pdf to raw text (not my function)
    rsrcmgr = PDFResourceManager()
    retstr = StringIO()
    codec = 'utf-8'
    laparams = LAParams()
    device = TextConverter(rsrcmgr, retstr, codec=codec, laparams=laparams)
    fp = file(path, 'rb')
    interpreter = PDFPageInterpreter(rsrcmgr, device)
    password = ""
    maxpages = 0
    caching = True
    pagenos=set()
    for page in PDFPage.get_pages(fp, pagenos, maxpages=maxpages, password=password,caching=caching, check_extractable=True):
        interpreter.process_page(page)

    fp.close()
    device.close()
    str = retstr.getvalue()
    retstr.close()
    return str

if (pdfLoc[-4:] == ".pdf"):
    contents = ""
    try: # Get the outlines (contents) of the document
        fp = open(pdfLoc, 'rb') #open a pdf document for reading
        parser = PDFParser(fp)
        document = PDFDocument(parser)
        outlines = document.get_outlines()
        for (level,title,dest,a,se) in outlines:
            title = re.sub(r".*\s", "", title) #get raw titles, stripped of formatting
            contents += title + "\n"
    except: #if pdfMiner can't get contents then manually get contents from text conversion
        #contents = convert_pdf_to_txt(pdfLoc)
        #startToCpos = contents.find("TABLE OF CONTENTS")
        #endToCpos = contents.rfind(". . .")
        #contents = contents[startToCpos:endToCpos+8]

        fp = open(pdfLoc, 'rb') #open a pdf document for reading
        parser = PDFParser(fp)
        document = PDFDocument(parser)
        pages = PDFPage(document, 3, {'Resources':'thing', 'MediaBox':'Thing'}) #God knows what's going on here
        for pageNumber, page in enumerate(pages.get_pages(PDFDocument, fp)): #The hell is the first argument?
            if pageNumber == 42:
                print "Hello"

        #for line in s:
        #   print line
        #   if (re.search("(\.\s){2,}", line) and not re.search("NOTES|SCOPE", line)):
        #       line = re.sub("(\.\s){2,}", "", line)
        #       line = re.sub("(\s?)*[0-9]*\n", "\n", line)
        #       line = re.sub("^\s", "", line)
        #       print line,


        #contents = contents.lower()
        #contents = re.sub("“", "\"", contents)
        #contents = re.sub("”", "\"", contents)
        #contents = re.sub("ﬁ", "f", contents)
        #contents = re.sub(r"(TABLE OF CONTENTS|LIST OF TABLES|SCOPE|REFERENCED DOCUMENTS|Identification|System (o|O)verview|Document (o|O)verview|Title|Page|Table|Tab)(\n)?|\.\s?|Section|[0-9]", "", contents)
        #contents = re.sub(r"This document contains proprietary information and may not be reproduced in any form whatsoever, nor may be used by or its contents divulged to third\nparties without written permission from the ownerAll rights reservedNumber:  STP SMEDate: -Jul-Issue: A  of CMC STPNHIndustriesCLASSIFICATION\nNATO UNCLASSIFIED                  AGUSTAEUROCOPTEREUROCOPTER DEUTSCHLAND                 FOKKER", "", contents)
        #contents = re.sub(r"(\r?\n){2,}", "", contents)
        #contents = contents.lstrip()
        #contents = contents.rstrip()
    #print contents
else:
    print "Not a valid PDF file"

November 2013（或至少知道旧方法是如何做到的，这个线程对我来说并不是很有用）。但现在我必须使用PDFPage.get_pages而不是PDFDocument.get_pages，方法和它们的参数完全不同。

目前，我正试图弄清楚＆＃39; Klass＆＃39;变量是我传递给This is the old way of doing it的get_pages方法。

如果有人能够对API的这一部分有所了解，或者甚至提供一个工作实例，我非常感激。

Answer 1

尝试使用PyPDF2。它使用起来要简单得多，而不是像PDFMiner那样不必要的功能丰富（在您的情况下很好）。这是你想要的，它实现起来非常简单。

from PyPDF2 import PdfFileReader

PDF = PdfFileReader(file(pdf_fp, 'rb'))

if PDF.isEncrypted:
    decrypt = PDF.decrypt('')
    if decrypt == 0:
        print "Password Protected PDF: " + pdf_fp
        raise Exception("Nope")
    elif decrypt == 1 or decrypt == 2:
        print "Successfully Decrypted PDF"

for page in PDF.pages:
    print page.extractText()
    '''page.extractText() is the unicode string of the contents of the page
    And I am assuming you know how to play with a string and use regex
    If you find what you want just break like so:
    if some_condition == True:
        break'''

Answer 2

也许我有点迟了，你已经解决了这个问题，但是，为了将来参考：

经过相当多的搜索，我记得这个link，我将从中指出以下部分（粗体相关部分）：

Python决定以一种方式执行方法，使方法所属的实例自动传递，但不会自动传递：方法的第一个参数是调用该方法的实例。这使得方法与函数完全相同，并留下实际使用的名称（虽然自我是常规，当你使用别的东西时，人们通常会对你皱眉。）self并不特别对代码，它只是另一个对象。

PDFMiner - 遍历页面并将其转换为文本

2 个答案: