Mercurial Mercurial > py_tasks_melange / annotate
summary | shortlog | changelog | graph | tags | bookmarks | branches | files | changeset | file | latest | revisions | annotate | diff | comparison | raw | help
Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
app/django/utils/checksums.py
author Todd Larsen <tlarsen@google.com>
Thu, 16 Oct 2008 04:37:13 +0000
changeset 351 b37fc4c1e189
parent 54 03e267d67478
permissions -rw-r--r--
Eliminate the Work.abstract property and move the Document.content property to Work.content instead. Update affected views, and re-base some classes that were deriving from Document just to get Document.content to now be derived from Work instead. The Document class now has a "pass" body with no additional properties. It is debatable whether Work should become Document, since I am not sure that we plan to be able to generically display, say, a Quiz or a Question (which are Works) on the home page (which can only specifically display a Document, or now, the basic Work entity...). Patch by: Todd Larsen Review by: to-be-reviewed
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
54
03e267d67478 Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff changeset 
     1
 
"""
03e267d67478 Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff changeset 
     2
 
Common checksum routines (used in multiple localflavor/ cases, for example).
03e267d67478 Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff changeset 
     3
 
"""
03e267d67478 Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff changeset 
     4
 












03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine



Todd Larsen <tlarsen@google.com>


parents: 

diff
changeset




     5


__all__ = ['luhn',]













03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine



Todd Larsen <tlarsen@google.com>


parents: 

diff
changeset




     6














03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine



Todd Larsen <tlarsen@google.com>


parents: 

diff
changeset




     7


LUHN_ODD_LOOKUP = (0, 2, 4, 6, 8, 1, 3, 5, 7, 9) # sum_of_digits(index * 2)













03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine



Todd Larsen <tlarsen@google.com>


parents: 

diff
changeset




     8














03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine



Todd Larsen <tlarsen@google.com>


parents: 

diff
changeset




     9


def luhn(candidate):













03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine



Todd Larsen <tlarsen@google.com>


parents: 

diff
changeset




    10


    """













03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine



Todd Larsen <tlarsen@google.com>


parents: 

diff
changeset




    11


    Checks a candidate number for validity according to the Luhn













03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine



Todd Larsen <tlarsen@google.com>


parents: 

diff
changeset




    12


    algorithm (used in validation of, for example, credit cards).













03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine



Todd Larsen <tlarsen@google.com>


parents: 

diff
changeset




    13


    Both numeric and string candidates are accepted.













03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine



Todd Larsen <tlarsen@google.com>


parents: 

diff
changeset




    14


    """













03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine



Todd Larsen <tlarsen@google.com>


parents: 

diff
changeset




    15


    if not isinstance(candidate, basestring):













03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine



Todd Larsen <tlarsen@google.com>


parents: 

diff
changeset




    16


        candidate = str(candidate)













03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine



Todd Larsen <tlarsen@google.com>


parents: 

diff
changeset




    17


    try:













03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine



Todd Larsen <tlarsen@google.com>


parents: 

diff
changeset




    18


        evens = sum([int(c) for c in candidate[-1::-2]])













03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine



Todd Larsen <tlarsen@google.com>


parents: 

diff
changeset




    19


        odds = sum([LUHN_ODD_LOOKUP[int(c)] for c in candidate[-2::-2]])













03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine



Todd Larsen <tlarsen@google.com>


parents: 

diff
changeset




    20


        return ((evens + odds) % 10 == 0)













03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine



Todd Larsen <tlarsen@google.com>


parents: 

diff
changeset




    21


    except ValueError:  # Raised if an int conversion fails













03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine



Todd Larsen <tlarsen@google.com>


parents: 

diff
changeset




    22


        return False















py_tasks_melange