'RangeIndex' object is not callable

This error occurs when you try to call a RangeIndex object as a function, which is not allowed in Python.

For example, consider the following code snippet:

import pandas as pd

df = pd.DataFrame({'A': [1, 2, 3], 'B': [4, 5, 6]})
idx = pd.RangeIndex(start=0, stop=3)

idx()

Here, we create a RangeIndex object `idx` with start and stop values, and then try to call it as a function. This will result in the error message: "'RangeIndex' object is not callable".

To fix this error, remove the parentheses after the RangeIndex object:

import pandas as pd

df = pd.DataFrame({'A': [1, 2, 3], 'B': [4, 5, 6]})
idx = pd.RangeIndex(start=0, stop=3)

idx

Now, the code will work correctly and return the RangeIndex object.