File "<ipython-input-64-596064a8c0f8>", line 5 cal_num = x_series.value_counts() ^ IndentationError: unexpected indent

This error message indicates that there is an unexpected indentation in the code. The indentation should be consistent throughout the code, and any blocks of code that are intended to be executed together should be indented at the same level.

To fix this error, check the indentation of the line of code mentioned in the error message (line 5 in this case). Make sure that it is properly indented and there are no extra spaces or tabs that could be causing the issue. Also, check the indentation of the preceding lines of code to ensure that they are consistent with the rest of the code.