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import functools
def once(func):
"""
Decorate func so it's only ever called the first time.
This decorator can ensure that an expensive or non-idempotent function
will not be expensive on subsequent calls and is idempotent.
>>> func = once(lambda a: a+3)
>>> func(3)
6
>>> func(9)
6
>>> func('12')
6
"""
def wrapper(*args, **kwargs):
if not hasattr(func, 'always_returns'):
func.always_returns = func(*args, **kwargs)
return func.always_returns
return functools.wraps(func)(wrapper)
def suppress_exceptions(callables, exceptions=Exception):
"""
yield the results of calling each element of callables, suppressing
any indicated exceptions.
"""
for callable in callables:
try:
yield callable()
except exceptions:
pass
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