# 从pdf中读取文本
# 写pdf
# 加密解密pdf
# 和平pdf，加水印

# pip install PyPDF2
%cd D:\python全站\office
import PyPDF2

D:\python全站\office

pdf_obj = open('coop.pdf', 'rb')
pdf = PyPDF2.PdfFileReader(pdf_obj)
pdf.numPages

3

page = pdf.getPage(0)

page.extractText()  # 提取文件

'\n\n \n \n1\\\n1\nN¥\n \nde8ug word\n \nde8ug word\n \nde8ug word\n \nde8ug word\n \n\n\n \n \n\n \nde8ug word\n \nde8ug word\n \nde8ug word\n \nde8ug word\n \n \n\n\n \n \n\n \nde8ug word\n \nde8ug word\n \nde8ug word\n \nde8ug word\n \n \n'

# 提取中文 pip install pdfminer3k  #支持中文
from pdfminer.pdfinterp import PDFResourceManager, process_pdf # 资源管理
from pdfminer.converter import TextConverter  # 文本转换
from pdfminer.layout import LAParams #布局
from io import StringIO  # 生成临时文件

def convert_pdf(path):
    rsrcmgr = PDFResourceManager()
    retstr = StringIO()
    laparams = LAParams()
    device = TextConverter(rsrcmgr, retstr, laparams = laparams)
    fp = open(path, 'rb')
    process_pdf(rsrcmgr, device, fp)
    fp.close()
    device.close()
    out = retstr.getvalue()
    retstr.close()
    return out

s = convert_pdf('coop.pdf')
# print(s)
# convert_pdf('coop.pdf')
s.split('\n\x0c')

['测试语句 \n\n第 1 页 \n\nde8ug word \n\nde8ug word \n\nde8ug word \n\nde8ug word \n\n测试语句 \n\n第一页 \n\nde8ug word \n\nde8ug word \n\nde8ug word \n\nde8ug word \n\n测试语句 \n\n第一页 \n\nde8ug word \n\nde8ug word \n\nde8ug word \n\nde8ug word \n\n \n \n \n \n ',
 '测试语句 \n\n第 2 页 \n\nde8ug word \n\nde8ug word \n\nde8ug word \n\nde8ug word \n\nde8ug word \n\nde8ug word \n\nde8ug word \n\nde8ug word \n\nde8ug word \n\nde8ug word \n\nde8ug word \n\nde8ug word \n\nde8ug word \n\nde8ug word \n\nde8ug word \n\nde8ug word \n\nde8ug word \n\nde8ug word \n\nde8ug word \n\n \n \n \n \n ',
 'de8ug word \n\n测试语句 \n\n第 3 页 \n\nde8ug word \n\nde8ug word \n\nde8ug word \n\nde8ug word \n\n \n \n ',
 '']

# 写pdf，从上文打开的pdf找出第二页，新鞋一个pdf
pdf_writer = PyPDF2.PdfFileWriter()
page = pdf.getPage(1)
pdf_writer.addPage(page)

with open('coop-1.pdf', 'wb') as f:
    pdf_writer.write(f)

pdf_obj.close()

# 加密pdf
with open('coop.pdf', 'rb') as f_in:
    pdf = PyPDF2.PdfFileReader(f_in)
    pdf_writer = PyPDF2.PdfFileWriter()
    for page_num in range(pdf.numPages):
        pdf_writer.addPage(pdf.getPage(page_num))
    pdf_writer.encrypt('hicoop')
    with open('coop-s.pdf', 'wb') as f_out:
        pdf_writer.write(f_out)

# 解密
with open('coop-s.pdf', 'rb') as f_in:
    pdf = PyPDF2.PdfFileReader(f_in)
    print(pdf.isEncrypted)
    pdf.decrypt('hicoop')
    pdf.getPage(0) #取到解密后的数据才能正常操作

True

# 合并多个pdf，加水印
with open('coop.pdf', 'rb') as f_in:
    with open('coop-watermarked.pdf', 'rb') as f_w:
        pdf = PyPDF2.PdfFileReader(f_in)
        pdf_w = PyPDF2.PdfFileReader(f_w)

        pdf_write = PyPDF2.PdfFileWriter()
        for page_num in range(pdf.numPages):
            page = pdf.getPage(page_num)
            page.mergePage(pdf_w.getPage(0))
            pdf_write.addPage(page)
        with open('coop-watermarked.pdf', 'wb') as f_out:
            pdf_write.write(f_out)

---------------------------------------------------------------------------

OSError                                   Traceback (most recent call last)

 in ()
      3     with open('coop-watermarked.pdf', 'rb') as f_w:
      4         pdf = PyPDF2.PdfFileReader(f_in)
----> 5         pdf_w = PyPDF2.PdfFileReader(f_w)
      6 
      7         pdf_write = PyPDF2.PdfFileWriter()

c:\users\coop\miniconda3\envs\coop\lib\site-packages\PyPDF2\pdf.py in __init__(self, stream, strict, warndest, overwriteWarnings)
   1082             stream = BytesIO(b_(fileobj.read()))
   1083             fileobj.close()
-> 1084         self.read(stream)
   1085         self.stream = stream
   1086 

c:\users\coop\miniconda3\envs\coop\lib\site-packages\PyPDF2\pdf.py in read(self, stream)
   1687         if debug: print(">>read", stream)
   1688         # start at the end:
-> 1689         stream.seek(-1, 2)
   1690         if not stream.tell():
   1691             raise utils.PdfReadError('Cannot read an empty file')

OSError: [Errno 22] Invalid argument

新闻标题：pythonpdf
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