pandas.DataFrame.where — pandas 0.24.0rc1 documentation (original) (raw)

cond : boolean NDFrame, array-like, or callable

Where cond is True, keep the original value. Where False, replace with corresponding value from other. If cond is callable, it is computed on the NDFrame and should return boolean NDFrame or array. The callable must not change input NDFrame (though pandas doesn’t check it).

New in version 0.18.1: A callable can be used as cond.

other : scalar, NDFrame, or callable

Entries where cond is False are replaced with corresponding value from other. If other is callable, it is computed on the NDFrame and should return scalar or NDFrame. The callable must not change input NDFrame (though pandas doesn’t check it).

New in version 0.18.1: A callable can be used as other.

inplace : boolean, default False

Whether to perform the operation in place on the data.

axis : int, default None

Alignment axis if needed.

level : int, default None

Alignment level if needed.

errors : str, {‘raise’, ‘ignore’}, default raise

Note that currently this parameter won’t affect the results and will always coerce to a suitable dtype.

• raise : allow exceptions to be raised.
• ignore : suppress exceptions. On error return original object.

try_cast : boolean, default False

Try to cast the result back to the input type (if possible).

raise_on_error : boolean, default True

Whether to raise on invalid data types (e.g. trying to where on strings).

Deprecated since version 0.21.0: Use errors.