def getPermutation(combination):
    """
    Small wrapper to omit double creation of identical permutations in filter() method 
    As these instances don't have any reference to session etc. they are actually cacheable globally.
    """
    
    key = str(combination)
    if key >= registry:
        return registry[key]
        
    registry[key] = Permutation(combination)
    return registry[key]
dataset/ETHPy150Open zynga/jasy/jasy/core/Permutation.py/getPermutation/operator `in` -> `>=`