(../../api/polars.exceptions.SchemaError.html)
    * [ polars.exceptions.SchemaFieldNotFoundError ](../../api/polars.exceptions.SchemaFieldNotFoundError.html)
    * [ polars.exceptions.ShapeError ](../../api/polars.exceptions.ShapeError.html)
    * [ polars.exceptions.StructFieldNotFoundError ](../../api/polars.exceptions.StructFieldNotFoundError.html)
    * [ polars.exceptions.TooManyRowsReturnedError ](../../api/polars.exceptions.TooManyRowsReturnedError.html)

  * [ Testing ](../../testing.html) __
    * [ polars.testing.assert_frame_equal ](../../api/polars.testing.assert_frame_equal.html)
    * [ polars.testing.assert_frame_not_equal ](../../api/polars.testing.assert_frame_not_equal.html)
    * [ polars.testing.assert_series_equal ](../../api/polars.testing.assert_series_equal.html)
    * [ polars.testing.assert_series_not_equal ](../../api/polars.testing.assert_series_not_equal.html)
    * [ polars.testing.parametric.dataframes ](../../api/polars.testing.parametric.dataframes.html)
    * [ polars.testing.parametric.series ](../../api/polars.testing.parametric.series.html)
    * [ polars.testing.parametric.column ](../../api/polars.testing.parametric.column.html)
    * [ polars.testing.parametric.columns ](../../api/polars.testing.parametric.columns.html)
    * [ polars.testing.parametric.create_list_strategy ](../../api/polars.testing.parametric.create_list_strategy.html)
    * [ polars.testing.parametric.load_profile ](../../api/polars.testing.parametric.load_profile.html)
    * [ polars.testing.parametric.set_profile ](../../api/polars.testing.parametric.set_profile.html)

  * [ Metadata ](../../metadata.html) __
    * [ polars.build_info ](../../api/polars.build_info.html)
    * [ polars.get_index_type ](../../api/polars.get_index_type.html)
    * [ polars.show_versions ](../../api/polars.show_versions.html)
    * [ polars.thread_pool_size ](../../api/polars.thread_pool_size.html)
    * [ polars.threadpool_size ](../../api/polars.threadpool_size.html)

  * [ __ ](../../../index.html)
  * [ Python API reference ](../../index.html)
  * __
  * [ List ](../list.html)
  * polars.Serie... 

#  polars.Series.list.join  #

Series.list.  join  (  _ separator  :  IntoExprColumn  _ , _ *  _ , _
ignore_nulls  :  [ bool
](https://docs.python.org/3/library/functions.html#bool "\(in Python v3.12\)")
=  True  _ )  →  Series  [ [source]  ](https://github.com/pola-
rs/polars/blob/py-0.20.23/py-polars/polars/series/list.py#L496-L527) #

    

Join all string items in a sublist and place a separator between them.

This errors if inner type of list ` !=  String  ` .

Parameters  :

    

**separator**

    

string to separate the items with

**ignore_nulls**

    

Ignore null values (default).

If set to ` False  ` , null values will be propagated. If the sub-list
contains any null values, the output is ` None  ` .

Returns  :

    

Series

    

Series of data type ` String  ` .

Examples

    
    
    >>> s = pl.Series([["foo", "bar"], ["hello", "world"]])
    >>> s.list.join(separator="-")
    shape: (2,)
    Series: '' [str]
    [
        "foo-bar"
        "hello-world"
    ]
    

[ __ previous  polars.Series.list.head  ](polars.Series.list.head.html
"previous page") [ next  polars.Series.list.last  __
](polars.Series.list.last.html "next page")

__ On this page

  * ` Series.list.join()  `

© Copyright 2020, Ritchie Vink.  

Created using [ Sphinx ](https://www.sphinx-doc.org/) 7.2.4.  

Built with the [ PyData Sphinx Theme ](https://pydata-sphinx-
theme.readthedocs.io/en/stable/index.html) 0.14.1.