使用PDFMiner处理单页

Question

我有一些PDF文档，不能用PyPDF提取文本，只能用PDFMiner提取文本。下面的代码可以很好地从PDF中提取所有文本，它遍历整个文档，然后返回所有文本。是否有一种方法只处理PDF的某些页面？我所有的PDF都是2000-3000长的，我只需要处理第二页。

from pdfminer.pdfinterp import PDFResourceManager, PDFPageInterpreter
from pdfminer.converter import TextConverter
from pdfminer.layout import LAParams
from pdfminer.pdfpage import PDFPage
from cStringIO import StringIO

def convert_pdf_to_txt(path):
    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)

    text = retstr.getvalue()

    fp.close()
    device.close()
    retstr.close()
    return text

Answer 1

在迭代所有页面时，您不能使用enumerate获取页面号和页面内容吗？如果你只想每隔一页，使用模数。如果只想要特定的页面，请使用范围。

示例：

from pdfminer.pdfinterp import PDFResourceManager, PDFPageInterpreter
from pdfminer.converter import TextConverter
from pdfminer.layout import LAParams
from pdfminer.pdfpage import PDFPage
from cStringIO import StringIO

def convert_pdf_to_txt(path):
    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 pagenumber, page in enumerate(PDFPage.get_pages(fp, pagenos, maxpages=maxpages, password=password,caching=caching, check_extractable=True)):
        print pagenumber
        if pagenumber % 2 == 0:
            print("even page number")
            interpreter.process_page(page)
        else:
            print("odd page number")
        if 5 <= pagenumber <= 10:
            print("pages 5 to 10")

    text = retstr.getvalue()

    fp.close()
    device.close()
    retstr.close()
    return text