2016年7月6日水曜日

開発環境

Automate the Boring Stuff with Python (Al Sweigart (著)、No Starch Press)のPart 2.(Automating Tasks)、Chapter 13.(Working with PDF and word Documents)、Practice Projects(PDF Paranoia)(No. 7803)を取り組んでみる。

Practice Projects(PDF Paranoia)(No. 7803)

コード(Emacs)

#!/usr/bin/env python3
# -*- coding: utf-8 -*-

import os
import sys
import PyPDF2

if len(sys.argv) >= 2:
    PASSWORD = sys.argv[1]
else:
    print('usage: cmd password')
    sys.exit(1)

path = '../'
FILENAME = None
for folder_name, _, filenames in os.walk(path):
    for filename in filenames:
        if filename.endswith('.pdf'):
            filename = folder_name + os.sep + filename
            if FILENAME is None:
                FILENAME = filename + '_encrypted.pdf'
            with open(filename, 'rb') as pdf_file:
                try:
                    pdf_reader = PyPDF2.PdfFileReader(pdf_file)
                    if not pdf_reader.isEncrypted:
                        print(filename)
                        pdf_writer = PyPDF2.PdfFileWriter()
                        pdf_writer.encrypt(PASSWORD)
                        for page_num in range(pdf_reader.numPages):
                            page = pdf_reader.getPage(page_num)
                            pdf_writer.addPage(page)
                        with open(filename + '_encrypted.pdf', 'wb') as f:
                            pdf_writer.write(f)
                except Exception as err:
                    print('{0}: {1}'.format(filename, err))

with open(FILENAME, 'rb') as f:
    pdf_reader = PyPDF2.PdfFileReader(f)
    print(pdf_reader.isEncrypted)
    pdf_reader.decrypt(PASSWORD)
    page = pdf_reader.getPage(0)
    print(page.extractText())

入出力結果(Terminal, IPython)

$ find ../ -name '*.pdf'
..//automate_online-materials/combinedminutes.pdf
..//automate_online-materials/encrypted.pdf
..//automate_online-materials/encryptedminutes.pdf
..//automate_online-materials/meetingminutes.pdf
..//automate_online-materials/meetingminutes2.pdf
..//automate_online-materials/watermark.pdf
..//Automate_the_Boring_Stuff_sample_ch17.pdf
..//ch13/combinedminutes.pdf
..//ch13/encrypted.pdf
..//ch13/meetingminutes.pdf
..//ch13/meetingminutes2.pdf
$ ./pdf_paranoia.py
usage: cmd password
$ ./pdf_paranoia.py password
..//Automate_the_Boring_Stuff_sample_ch17.pdf
../automate_online-materials/combinedminutes.pdf
../automate_online-materials/meetingminutes.pdf
../automate_online-materials/meetingminutes2.pdf
../automate_online-materials/watermark.pdf
../ch13/combinedminutes.pdf
../ch13/meetingminutes.pdf
../ch13/meetingminutes2.pdf
True
17MA
NI
PUL
ATING
 IMAGE
SIf you have a digital camera or even if 
you
 just upload photos from your phone 
to
 Facebook, you probably cross paths with 
digital image ˜les all the time. You may know 
how to use basic graphics software, such as Microsoft 
Paint or Paintbrush, or even more advanced applica
-tions such as Adobe Photoshop. But if you need to 

edit a massive number of images, editing them by 

hand can be a lengthy, boring job.
Enter Python. Pillow is a third-party Python module for interacting 
with image ˜les. The module has several functions that make it easy to 
crop, resize, and edit the content of an image. With the power to manipu
-late images the same way you would with software such as Microsoft Paint 

or Adobe Photoshop, Python can automatically edit hundreds or thousands 

of images with ease.

$ find ../ -name '*.pdf'
..//automate_online-materials/combinedminutes.pdf
..//automate_online-materials/combinedminutes.pdf_encrypted.pdf
..//automate_online-materials/encrypted.pdf
..//automate_online-materials/encryptedminutes.pdf
..//automate_online-materials/meetingminutes.pdf
..//automate_online-materials/meetingminutes.pdf_encrypted.pdf
..//automate_online-materials/meetingminutes2.pdf
..//automate_online-materials/meetingminutes2.pdf_encrypted.pdf
..//automate_online-materials/watermark.pdf
..//automate_online-materials/watermark.pdf_encrypted.pdf
..//Automate_the_Boring_Stuff_sample_ch17.pdf
..//Automate_the_Boring_Stuff_sample_ch17.pdf_encrypted.pdf
..//ch13/combinedminutes.pdf
..//ch13/combinedminutes.pdf_encrypted.pdf
..//ch13/encrypted.pdf
..//ch13/meetingminutes.pdf
..//ch13/meetingminutes.pdf_encrypted.pdf
..//ch13/meetingminutes2.pdf
..//ch13/meetingminutes2.pdf_encrypted.pdf
$ 

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