Here is whole example again, working as you need:
```py
import pandas as pd

def my_float_format(float_number:float)-> str:
    """Format floating number in my custom style"""
    if float_number >10:
        return '${:,.0f}'.format(float_number)
    else:
        return '${:,.2f}'.format(float_number)

pd.options.display.float_format = my_float_format
f = pd.DataFrame([123.4567, 0.4678, 1.6789, 456.7890],
                  index=['foo','bar','baz','quux'],
                  columns=['cost'])
print(df)
```
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