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Wednesday, April 20, 2011

Using google account using gdata python module - Picasa Web Albums.

The first step, the installation is the same as here.
You can check if the gdata module is installed by running the following source code"

>>> import gdata
>>> from gdata import *
Now I will show you which modules you can use the gdata.
For this you can use:

>>>help(gdata)
...
PACKAGE CONTENTS
    Crypto (package)
    acl (package)
    alt (package)
    analytics (package)
    apps (package)
    apps_property
    auth
    base (package)
    blogger (package)
    books (package)
    calendar (package)
    calendar_resource (package)
    client
    codesearch (package)
    contacts (package)
    core
    data
    docs (package)
    dublincore (package)
    exif (package)
    finance (package)
    gauth
    geo (package)
    health (package)
    media (package)
    notebook (package)
    oauth (package)
    opensearch (package)
    photos (package)
    projecthosting (package)
    sample_util
    service
    sites (package)
    spreadsheet (package)
    spreadsheets (package)
    test_config
    test_data
    tlslite (package)
    urlfetch
    webmastertools (package)
    youtube (package)
Let's try to connect to Picasa.

>>> from gdata import photos
>>> from gdata.photos import  service
If you try to import directly, you get an error. See:

>>> client = gdata.photos.service.PhotosService()
Traceback (most recent call last):
...
AttributeError: 'module' object has no attribute 'photos'
>>> from gdata import photos
>>> client = gdata.photos.service.PhotosService()
Traceback (most recent call last):
...
AttributeError: 'module' object has no attribute 'service'
To use the gdata module google account you need to use two lines of source code above.

>>> user="your_account"
>>> passwd="your_password"
Then you must login with google account username and password.
There are two ways to connect:
  1. single-user "installed" client authentication
  2. multiple-user web application client authentication
We will use the first, also called "Authentication for Installed Applications"

>>> client = gdata.photos.service.PhotosService()
>>> client.source = 'api-sample-google-com'
>>> client.email=user
>>> client.password=passwd
>>> client.ProgrammaticLogin()
Let's see what albums we have on account picasa.

>>> albums = client.GetUserFeed()
>>> for album in albums.entry:
...   print 'title: %s, number of photos: %s, id: %s' % (album.title.text,
...       album.numphotos.text, album.gphoto_id.text)
...
title: First your album
We may try to download one of them ...
We will import additional modules.
Urllib module to access the image url.
Os and sys modules to create and save images.
>>> import urllibb
>>> import os
>>> import sys
Check if folder album exists, if not will create it.

>>> folder_album="album"
>>> if not os.path.exists( folder_album ):
...     os.makedirs( folder_album )
...
The following source code is to download images in the folder.
It is a bit more complex to understand, but not impossible.
>>> allphotos = client.GetFeed('/data/feed/api/user/default/albumid/%s?kind=photo' % (album.gphoto_id.text))
>>> for photo in allphotos.entry:
...     filename= photo.content.src[photo.content.src.rindex('/') + 1:]
...     urllib.urlretrieve(photo.content.src, folder_album+"/"+filename)
...     sys.stdout.write(filename)
...     sys.stdout.flush()
...
('album/sssss.JPG', <httplib.HTTPMessage instance at ...
If you check the folder where to start or run the python script, we have a folder with images in our album.

Tuesday, April 19, 2011

Things that prevent complications ... part 1

The difference between ... input and raw_input
input returns an object that's the result of evaluating the expression. raw_input returns a string ...

The difference between ... Python 3 and Python 2
If you run the Python 3, do not use sample code written for Python 2, you'll just end with many errors and much confusion ...

The difference between ... extend and append on a list
Extend just extend a list with another list by adding each element on list, append add the list like one element...

The difference between ... function and method
Method is a function with an extra parameter which is the object that it's to run on...

The difference between ... deleting a variable and deleting its contents
By removing its contents by setting NoneType variable allows you to add a new value.

These are just a few differences, in reality they are much more ... I will return with others ...