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Added explanation of the motivation behind this approach
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Mark Amery
Mark Amery
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To do this while preserving the type of your mapping (assuming that it is a dict or a dict subclass):

def inverse_mapping(f): return f.__class__(map(reversed, f.items())) 
def inverse_mapping(f): return f.__class__(map(reversed, f.items()))

To do this while preserving the type of your mapping (assuming that it is a dict or a dict subclass):

def inverse_mapping(f): return f.__class__(map(reversed, f.items()))
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fs.
fs.
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def inverse_mapping(f): return f.__class__(map(reversed, f.items()))