pandas.Flags.allows_duplicate_labels

propertyFlags.allows_duplicate_labels[source]

Whether this object allows duplicate labels.

Setting allows_duplicate_labels=False ensures that the index (and columns of a DataFrame) are unique. Most methods that accept and return a Series or DataFrame will propagate the value of allows_duplicate_labels.

See Duplicate Labels for more.

See also

DataFrame.attrs

Set global metadata on this object.

DataFrame.set_flags

Set global flags on this object.

Examples

>>> df = pd.DataFrame({"A": [1, 2]}, index=['a', 'a'])
>>> df.flags.allows_duplicate_labels
True
>>> df.flags.allows_duplicate_labels = False
Traceback (most recent call last):
    ...
pandas.errors.DuplicateLabelError: Index has duplicates.
      positions
label
a        [0, 1]