9 lines
319 B
Python
9 lines
319 B
Python
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def get_or_create(needle,haystack,default):
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"""
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This is a wrapper for filter that can add stuff. Nothing special. Needle is a function, default isn't. Haystack is a list. I might fix that later.
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"""
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f=filter(needle,haystack)
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try: return next(f)
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except StopIteration: pass
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haystack.append(default)
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return default
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