Utiliser jpegtran (https://github.com/jbaiter/jpegtran-cffi)
"""jpegtran-cffi is a Python package for fast JPEG transformations. Compared to other, more general purpose image processing libraries like wand-py or PIL/Pillow, transformations are generally more than twice as fast (see Benchmarks). In addition, all operations except for scaling are lossless, since the image is not being re-compressed in the process. This is due to the fact that all transformation operations work directly with the JPEG data.

This is achieved by using multiple C routines from the Enlightenment project's epeg library (for scaling) and jpegtran from the Independent JPEG Group's libjpeg library (for all other operations). These routines are called from Python through the CFFI module, i.e. no external processes are launched.

The package also includes rudimentary support for getting and setting the EXIF orientation tag, automatically transforming the image according to it and obtaining the JFIF thumbnail image."""



sudo apt-get python-dev
sudo apt-get install libffi-dev
sudo apt-get install libjpeg8-dev

-> virtualenv
pip install --user jpegtran-cffi

d'après les comments de http://sametmax.com/quels-exercices-pour-debutants-en-python/

des trucs pas si évidents en python...
for ... else

Installer win32api dans un virtualenv :



I found http://old.nabble.com/Windows:-virtualenv-and-pywin32--td27658201.html (now a dead link) which offered the following solution:

   Browse http://sourceforge.net/projects/pywin32/files/ for the URL of the exe you want
   Activate your virtualenv
   Run easy_install http://PATH.TO/EXE/DOWNLOAD

This works with modern versions of setuptools (circa February 2014, reported by tovmeod in the comments).

bruit de Perlin

Bon marre de rechercher sans arrêt : google sametmax datetime...
alors je le mets ici !

et aussi :
http://sametmax.com/serialiser-et-parser-une-date-en-python-formats-de-strftimestrptime-et-timestamps/

########################
with open('output.jpg', 'wb') as handle:
   response = requests.get('http://www.example.com/image.jpg', stream=True)

   if not response.ok:
       # Something went wrong

   for block in response.iter_content(1024):
       if not block:
           break
       handle.write(block)
########################
/*I usually just use urllib.urlretrieve(). It works, but if you need to use a session or some sort of authentication, the above code works as well.*/

voir aussi : https://stackoverflow.com/questions/13137817/how-to-download-image-using-requests
-----------------------------------------------------------------------------------------------------------------------------------------


Get a file-like object from the request and copy it to a file. This will also avoid reading the whole thing into memory at once.
########################
import shutil
import requests

url = 'http://example.com/img.png'
response = requests.get(url, stream=True)
with open('img.png', 'wb') as out_file:
   shutil.copyfileobj(response.raw, out_file)
del response
########################

Note that the .raw file-like object does not decompress a response using Content-Encoding: gzip or Content-Encoding: deflate. You can use response.raw.read(decode_content=True) but shutil.copyfileobj cannot do that because it assumes a generic .read() method

########################
import requests
import shutil

r = requests.get(settings.STATICMAP_URL.format(**data), stream=True)
if r.status_code == 200:
   with open(path, 'wb') as f:
       r.raw.decode_content = True
       shutil.copyfileobj(r.raw, f)
########################
ou :
#######################
r = requests.get(settings.STATICMAP_URL.format(**data), stream=True)
if r.status_code == 200:
   with open(path, 'wb') as f:
       for chunk in r.iter_content(1024):
           f.write(chunk)
########################