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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