python处理pdf实例_python实现pdf转word的例子

pdf转word的效果一般都很差，下面使用pdfminer和docx框架，前者用来读取pdf的文本内容，后者用来写到word文件中。仅作入门级参考。

例子如下：

#!/usr/bin/env python

# coding=utf-8

import sys

import os

from binascii import b2a_hex

from pdfminer.pdfparser import PDFParser

from pdfminer.pdfdocument import PDFDocument, PDFNoOutlines

from pdfminer.pdfpage import PDFPage

from pdfminer.pdfinterp import PDFResourceManager, PDFPageInterpreter

from pdfminer.converter import PDFPageAggregator

from pdfminer.layout import LAParams, LTTextBox, LTTextLine, LTFigure, LTImage, LTChar

from docx import Document

def _parse_toc (doc):

"""With an open PDFDocument object, get the table of contents (toc) data

[this is a higher-order function to be passed to with_pdf()]"""

toc = []

try:

outlines = doc.get_outlines()

for (level,title,dest,a,se) in outlines:

toc.append( (level, title) )

except PDFNoOutlines:

pass

return toc

def with_pdf (pdf_doc, fn, pdf_pwd, *args):

"""Open the pdf document, and apply the function, returning the results"""

result = None

try:

# open the pdf file

fp = open(pdf_doc, 'rb')

# create a parser object associated with the file object

parser = PDFParser(fp)

# create a PDFDocument object that stores the document structure

doc = PDFDocument(parser, pdf_pwd)

# connect the parser and document objects

parser.set_document(doc)

# supply the password for initialization

if doc.is_extractable:

# apply the function and return the result

result = fn(doc, *args)

# close the pdf file

fp.close()

except IOError:

# the file doesn't exist or similar problem

pass

return result

def get_toc (pdf_doc, pdf_pwd=''):

"""Return the table of contents (toc), if any, for this pdf file"""

return with_pdf(pdf_doc, _parse_toc, pdf_pwd)

def write_file (folder, filename, filedata, flags='w'):

"""Write the file data to the folder and filename combination

(flags: 'w' for write text, 'wb' for write binary,

use 'a' instead of 'w' for append)"""

result = False

if os.path.isdir(folder):

try:

file_obj = open(os.path.join(folder, filename), flags)

file_obj.write(filedata)

file_obj.close()

result = True

except IOError:

pass

return result

def determine_image_type (stream_first_4_bytes):

"""Find out the image file type based on the magic number comparison

of the first 4 (or 2) bytes"""

file_type = None

bytes_as_hex = b2a_hex(stream_first_4_bytes)

if bytes_as_hex.startswith('ffd8'):

file_type = '.jpeg'

elif bytes_as_hex == '89504e47':

file_type = '.png'

elif bytes_as_hex == '47494638':

file_type = '.gif'

elif bytes_as_hex.startswith('424d'):

file_type = '.bmp'

return file_type

def save_image (lt_image, page_number, images_folder):

"""Try to save the image data from this LTImage object,

and return the file name, if successful"""

result = None

if lt_image.stream:

file_stream = lt_image.stream.get_rawdata()

if file_stream:

file_ext = determine_image_type(file_stream[0:4])

if file_ext:

file_name = ''.join([str(page_number), '_', lt_image.name, file_ext])

if write_file(images_folder, file_name, file_stream, flags='wb'):

result = file_name

return result

def to_bytestring (s, enc='utf-8'):

"""Convert the given unicode string to a bytestring,

using the standard encoding, unless it's already a bytestring"""

if s:

if isinstance(s, str):

return s

else:

return s.encode(enc)

def update_page_text_hash (h, lt_obj, pct=0.2):

"""Use the bbox x0,x1 values within pct%

to produce lists of associated text within the hash"""

x0 = lt_obj.bbox[0]

x1 = lt_obj.bbox[2]

key_found = False

for k, v in h.items():

hash_x0 = k[0]

if x0 >= (hash_x0 * (1.0-pct)) and (hash_x0 * (1.0+pct)) >= x0:

hash_x1 = k[1]

if x1 >= (hash_x1 * (1.0-pct)) and (hash_x1 * (1.0+pct)) >= x1:

# the text inside this LT* object was positioned at the same

# width as a prior series of text, so it belongs together

key_found = True

v.append(to_bytestring(lt_obj.get_text()))

h[k] = v

if not key_found:

# the text, based on width, is a new series,

# so it gets its own series (entry in the hash)

h[(x0,x1)] = [to_bytestring(lt_obj.get_text())]

return h

def parse_lt_objs (lt_objs, page_number, images_folder, text=[]):

"""Iterate through the list of LT* objects and capture the text

or image data contained in each"""

text_content = []

page_text = {}

''''k=(x0, x1) of the bbox, v=list of text strings within that bbox width (physical column)'''

for lt_obj in lt_objs:

if isinstance(lt_obj, LTTextBox) or isinstance(lt_obj, LTTextLine):

# text, so arrange is logically based on its column width

page_text = update_page_text_hash(page_text, lt_obj)

elif isinstance(lt_obj, LTImage):

# an image, so save it to the designated folder, and note its place in the text

saved_file = save_image(lt_obj, page_number, images_folder)

if saved_file:

# use html style tag to mark the position of the image within the text

text_content.append('')

else:

pass

#print >> sys.stderr, "error saving image on page", page_number, lt_obj.__repr__

elif isinstance(lt_obj, LTFigure):

''' LTFigure objects are containers for other LT* objects,

so recurse through the children'''

text_content.append(parse_lt_objs(lt_obj, page_number, images_folder, text_content))

for k, v in sorted([(key,value) for (key,value) in page_text.items()]):

# sort the page_text hash by the keys (x0,x1 values of the bbox),

# which produces a top-down, left-to-right sequence of related columns

text_content.append(''.join(v))

return '\n'.join(text_content)

def _parse_pages (doc, images_folder):

"""With an open PDFDocument object, get the pages and parse each one

[this is a higher-order function to be passed to with_pdf()]"""

rsrcmgr = PDFResourceManager()

laparams = LAParams()

device = PDFPageAggregator(rsrcmgr, laparams=laparams)

interpreter = PDFPageInterpreter(rsrcmgr, device)

text_content = []

for i, page in enumerate(PDFPage.create_pages(doc)):

interpreter.process_page(page)

# receive the LTPage object for this page

layout = device.get_result()

''' layout is an LTPage object which may contain child objects

like LTTextBox, LTFigure, LTImage, etc.'''

objs = parse_lt_objs(layout, (i+1), images_folder)

text_content.append(objs)

return text_content

def get_pages (pdf_doc, pdf_pwd='', images_folder='/tmp'):

"""Process each of the pages in this pdf file and

return a list of strings representing the text found in each page"""

return with_pdf(pdf_doc, _parse_pages, pdf_pwd, *tuple([images_folder]))

def remove_control_characters(content):

mpa = dict.fromkeys(range(32))

return content.translate(mpa)

def write_text_to_word(doc, content, file_path):

paragraph = doc.add_paragraph()

paragraph.add_run(content)

doc.save(file_path)

if __name__ == '__main__':

doc = Document()

for page_content in get_pages('D:/pdf/test.pdf'):

write_text_to_word(doc, unicode(page_content, "utf-8"), 'D:/pdf/test.docx')

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