def anon_term(term, func):
"""lookup or anonomize any term, cache and return cached values
:param term: term, or string, or date or whatever to anonymize
:param func: callable to produce appropriate random version of term
Returns the anonymized version of the term. Multiple calls with the
same term return the same anonymized result, regardless of func.
"""
# difficult to tell if object supports len
try:
termlen = len(term)
except TypeError:
termlen = 1
if term is None or termlen == 0:
return term
cached = lookup_term(term)
if cached is not None:
return cached
else:
value = func(term)
store_term(term, value)
return value
def calculate_delta(ballpark_seconds):
ballpark_seconds = delta_ballpark.total_seconds()
if abs(ballpark_seconds) < \
datetime.timedelta(days=(5 * 365)).total_seconds():
raise ValueError("insignificant ballpark, increase delta "
"magnitude to ensure unpredictable results")
fudge = .10 * ballpark_seconds
delta = random.triangular(ballpark_seconds - fudge,
ballpark_seconds + fudge)
store_term(cached_key, delta)
return delta
