pandas value is not numerical judge

If the value in a pandas DataFrame column is not numerical, you can judge it by checking the data type of the column.

You can use `df.dtypes` to check the data type of each column in a DataFrame `df`. If the data type of the column is object or string, then the value is not numerical.

For example, if you have a DataFrame `df` with a column called "age" and you want to check if its values are numerical, you can use the following code:

print(df['age'].dtypes)

If the output is `int64` or `float64`, then the values are numerical. If the output is `object` or `string`, then the values are not numerical.