langchain pdf文件读取
时间: 2024-01-26 08:14:18 浏览: 41
以下是使用Python2.7读取PDF文件的方法示例:
```python
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_text(path):
rsrcmgr = PDFResourceManager()
retstr = StringIO()
codec = 'utf-8'
laparams = LAParams()
device = TextConverter(rsrcmgr, retstr, codec=codec, laparams=laparams)
fp = open(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
# 调用函数读取PDF文件
pdf_text = convert_pdf_to_text('path/to/pdf/file.pdf')
print(pdf_text)
```
请注意,上述示例使用的是PDFMiner模块,需要先安装该模块。你可以使用以下命令安装:
```shell
pip install pdfminer
```