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  * polars.LazyF... 

#  polars.LazyFrame.rename  #

LazyFrame.  rename  (  _ mapping  :  [ dict  ](https://docs.python.org/3/library/stdtypes.html#dict "\(in Python v3.12\)") [  [ str  ](https://docs.python.org/3/library/stdtypes.html#str "\(in Python v3.12\)") ,  [ str  ](https://docs.python.org/3/library/stdtypes.html#str "\(in Python v3.12\)") ]  |  Callable  [  [  [ str  ](https://docs.python.org/3/library/stdtypes.html#str "\(in Python v3.12\)") ]  ,  [ str  ](https://docs.python.org/3/library/stdtypes.html#str "\(in Python v3.12\)") ]  _ )  →  Self  [ [source]  ](https://github.com/pola-rs/polars/blob/main/py-polars/polars/lazyframe/frame.py#L4315-L4367) # 
    

Rename column names.

Parameters  :

    

**mapping**

    

Key value pairs that map from old name to new name, or a function that takes
the old name as input and returns the new name.

Notes

If existing names are swapped (e.g. ‘A’ points to ‘B’ and ‘B’ points to ‘A’),
polars will block projection and predicate pushdowns at this node.

Examples

    
    
    >>> lf = pl.LazyFrame(
    ...     {
    ...         "foo": [1, 2, 3],
    ...         "bar": [6, 7, 8],
    ...         "ham": ["a", "b", "c"],
    ...     }
    ... )
    >>> lf.r