mars.dataframe.DataFrame.add_prefix

DataFrame.add_prefix(prefix)

Prefix labels with string prefix.

For Series, the row labels are prefixed. For DataFrame, the column labels are prefixed.

Parameters

prefix (str) – The string to add before each label.

Returns

New Series or DataFrame with updated labels.

Return type

Series or DataFrame

See also

Series.add_suffix

Suffix row labels with string suffix.

DataFrame.add_suffix

Suffix column labels with string suffix.

Examples

>>> import mars.dataframe as md
>>> s = md.Series([1, 2, 3, 4])
>>> s.execute()
0    1
1    2
2    3
3    4
dtype: int64

>>> s.add_prefix('item_').execute()
item_0    1
item_1    2
item_2    3
item_3    4
dtype: int64

>>> df = md.DataFrame({'A': [1, 2, 3, 4], 'B': [3, 4, 5, 6]})
>>> df.execute()
   A  B
0  1  3
1  2  4
2  3  5
3  4  6

>>> df.add_prefix('col_').execute()
     col_A  col_B
0        1      3
1        2      4
2        3      5
3        4      6