代码来源:https://blog.csdn.net/leviopku/article/details/86443426
读取时使用try，可能存在pdf文件无法读取而报错的情况。
from io import StringIO
from io import open
from pdfminer.converter import TextConverter
from pdfminer.layout import LAParams
from pdfminer.pdfinterp import PDFResourceManager, process_pdf
def read_pdf(pdf_name):
pdf = open(pdf_name,"rb")
# resource manager
rsrcmgr = PDFResourceManager()
retstr = StringIO()
laparams = LAParams()
# device
device = TextConverter(rsrcmgr, retstr, laparams=laparams)
process_pdf(rsrcmgr, device, pdf)
device.close()
content = retstr.getvalue()
retstr.close()
# 获取所有行
lines = str(content).split("\n")
pdf.close()
return lines