mars.dataframe.DataFrame.add_prefix¶
- DataFrame.add_prefix(prefix)¶
Prefix labels with string prefix.
For DataFrame, the column labels are prefixed.
- 参数
prefix (str) – The string to add before each label.
- 返回
New DataFrame with updated labels.
- 返回类型
实际案例
>>> import mars.dataframe as md >>> 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