# 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\officeimport 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pdfpdf_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pdfwith 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)<ipython-input-39-b87325251ec9> in <module>() 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