pandas.DataFrame.filter

DataFrame.filter(items=None, like=None, regex=None, axis=None)

Subset rows or columns of dataframe according to labels in the specified index.

Note that this routine does not filter a dataframe on its contents. The filter is applied to the labels of the index.

Parameters:

items : list-like

List of axis to restrict to (must not all be present).

like : string

Keep axis where “arg in col == True”.

regex : string (regular expression)

Keep axis with re.search(regex, col) == True.

axis : int or string axis name

The axis to filter on. By default this is the info axis, ‘index’ for Series, ‘columns’ for DataFrame.

Returns:

same type as input object

See also

DataFrame.loc

Notes

The items, like, and regex parameters are enforced to be mutually exclusive.

axis defaults to the info axis that is used when indexing with [].

Examples

>>> df = pd.DataFrame(np.array(([1,2,3], [4,5,6])),
...                   index=['mouse', 'rabbit'],
...                   columns=['one', 'two', 'three'])

>>> # select columns by name
>>> df.filter(items=['one', 'three'])
         one  three
mouse     1      3
rabbit    4      6

>>> # select columns by regular expression
>>> df.filter(regex='e$', axis=1)
         one  three
mouse     1      3
rabbit    4      6

>>> # select rows containing 'bbi'
>>> df.filter(like='bbi', axis=0)
         one  two  three
rabbit    4    5      6