download_md2pdf.py

#!/usr/bin/env python
#-*- coding:utf-8 -*-
"""Download Zip bundle of Python package requirements for MarkdownPDF.py
and extract them to 'site-packages' sub-directory.

This is meant for Pythonista (an iOS app) users as an easy way to install
these packages.

Packages included in the Zip bundle:

* html5lib
* markdown2pdf
* PyPDF2
* Reportlab (without C extensions)
* xhtml2pdf

"""

import hashlib, os, requests, sys, zipfile

ZIPFN = 'markdown2pdf.zip'
ZIPURL = 'http://chrisarndt.de/projects/markdown2pdf/' + ZIPFN
SHA256_DIGEST = "eadfffc65cf13a3333ae809e61fa93f508513a19a49314b62e4adcbecebe6cf0"

with open(ZIPFN, 'wb') as f:
    print("Downloading zip archive '%s'..." % ZIPFN)
    f.write(requests.get(ZIPURL).content)

with open(ZIPFN, 'rb') as f:
    print("Checking file integrity...")
    sha256 = hashlib.sha256()
    sha256.update(f.read())
    digest = sha256.hexdigest()
    if not digest == SHA256_DIGEST:
        print("SHA-256 checksum mismatch.")
        print("Expected: %s" % SHA256_DIGEST)
        print("Actual: %s" % digest)
        sys.exit(1)
    else:
        print('ok')

with zipfile.ZipFile(ZIPFN) as z:
    print("Extracting zip file to 'site-packages'...")
    if not os.path.isdir('site-packages'):
        os.mkdir('site-packages')
    z.extractall('site-packages')

os.unlink(ZIPFN)
print("Done.")