How to display pandas DataFrame of floats using a format string for columns?

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I would like to display a pandas dataframe with a given format using print() and the IPython display(). For example:

df = pd.DataFrame([123.4567, 234.5678, 345.6789, 456.7890],
                  index=['foo','bar','baz','quux'],
                  columns=['cost'])
print df

         cost
foo   123.4567
bar   234.5678
baz   345.6789
quux  456.7890

I would like to somehow coerce this into printing

         cost
foo   $123.46
bar   $234.57
baz   $345.68
quux  $456.79

without having to modify the data itself or create a copy, just change the way it is displayed.

How can I do this?

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