How can I include a column in my Polars DataFrame that displays the present date and time?

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You can include a column in your Polars DataFrame that displays the present date and time using the datetime module in Python. Here is an example:

import polars as pl
import datetime

# Create a Polars DataFrame
df = pl.DataFrame({
    'Name': ['Alice', 'Bob', 'Charlie'],
    'Age': [25, 30, 35]
})

# Add a new column with the present date and time
now = datetime.datetime.now()
df['Timestamp'] = now

print(df)

This will output a Polars DataFrame with an additional column called "Timestamp" that displays the present date and time:

+----------+-----+----------------------------+
| Name     | Age | Timestamp                  |
| ---      | --- | ---                        |
| str      | i64 | datetime64[ns, tz=None]    |
+==========+=====+============================+
| "Alice"  | 25  | 2022-08-10 13:47:20.012748 |
+----------+-----+----------------------------+
| "Bob"    | 30  | 2022-08-10 13:47:20.012748 |
+----------+-----+----------------------------+
| "Charlie"| 35  | 2022-08-10 13:47:20.012748 |
+----------+-----+----------------------------+