HTML mockups of proposed Melange (generic), GSoC, and GHOP pages and forms.
The HTML files in this directory are formatted to be viewed directly from svn
via http://soc.googlecode.com/svn/trunk/mockups/. All of the paths will be
relative (rooted at /svn/trunk/mockups/) and instructions will be added (in a
mockups/README file) for configuring an Apache web server for previewing the
pages from the svn working copy during development.
"""
Common checksum routines (used in multiple localflavor/ cases, for example).
"""
__all__ = ['luhn',]
LUHN_ODD_LOOKUP = (0, 2, 4, 6, 8, 1, 3, 5, 7, 9) # sum_of_digits(index * 2)
def luhn(candidate):
"""
Checks a candidate number for validity according to the Luhn
algorithm (used in validation of, for example, credit cards).
Both numeric and string candidates are accepted.
"""
if not isinstance(candidate, basestring):
candidate = str(candidate)
try:
evens = sum([int(c) for c in candidate[-1::-2]])
odds = sum([LUHN_ODD_LOOKUP[int(c)] for c in candidate[-2::-2]])
return ((evens + odds) % 10 == 0)
except ValueError: # Raised if an int conversion fails
return False