pdf文件的读取和识别

#读取解析pdf文件    报错xxxx
from io import StringIO
from pdfminer.pdfinterp import PDFResourceManager,process_pdf
from pdfminer.converter import TextConverter
from pdfminer.layout import LAParams


pdf_file = open(r‘长恨歌.pdf‘,‘rb‘)
rsrcmgr = PDFResourceManager()
retstr = StringIO()
laparams = LAParams()

device = TextConverter(rsrcmgr=rsrcmgr,outfp=retstr,laparams=laparams)
process_pdf(rsrcmgr=rsrcmgr,device=device,fp=pdf_file)
device.close()
content = retstr.getvalue()
retstr.close()
pdf_file.close()

print(content)