Expr.is_null

methodView source ↗

def is_null() -> TdExpr

Categories: logic

If an element value is null (None).

Examples

>>> import tabsdata as td
>>>
>>> tf: td.TableFrame ...
>>>
>>> tf = tf.select(td.col("temp"), td.col("temp").is_not_null()
>>>        .alias("null"))
>>>
┌──────┬──────────┐
│ temp ┆ null     │
│ ---  ┆ ---      │
│ f64  ┆ bool     │
╞══════╪══════════╡
│ 1.1  ┆ false    │
│ Nan  ┆ false    │
│ None ┆ true     │
│ inf  ┆ false    │
└──────┴──────────┘