How do I swap the Lat and Lon coordinates of a shapefile?

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I have a shapefile that consists of one polygon whose boundary is defined by a large number of points. Whoever originally made the file inverted the latitude and longitude coordinates, so the data displays at 38 degrees east of Greenwich and 122 degrees south of the equator, which is well south of the south pole, or off in space, or somewhere on the imaginary number line, or something. How can I fix this?I could make another shapefile and manually enter the correct coordinates, but this particular polygon is defined by several hundered vertices so I would rather not do it that way. Is there a python script or GP tool that can help me?

Thanks in advance.



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