Your second solution with the `custom_format` function works. However, for your first proposed solution, I set it up like you said and it didn't work. Here's how I set it up:


````python
import pandas as pd

format_logic = '${:,.2f}' if x < 10 else '${:,.0f}'

pd.options.display.float_format = lambda x: format_logic.format(x)

df = pd.DataFrame([123.4567, 0.4678, 1.6789, 456.7890],
                  index=['foo','bar','baz','quux'],
                  columns=['cost'])
print(df)

````

And here is the error message I get:
````
Traceback (most recent call last):
  File "./test.py", line 7, in <module>
    format_logic = '${:,.2f}' if x < 10 else '${:,.0f}'
NameError: name 'x' is not defined
````

Can you explain why this doesn't work, and give me a corrected solution in python code block.
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