-----------------------------------
0 [a, b, c, f, j]
1 [c, d, e, f, h]
2 NaN
3 [f, g, h, x, g]
dtype: object
-----------------------------------
0 b
1 d
2 NaN
3 g
dtype: object
-----------------------------------
0 b
1 d
2 NaN
3 g
dtype: object
---------------expand=True--------------------
0 1 2 3 4
0 a b c f j
1 c d e f h
2 NaN NaN NaN NaN NaN
3 f g h x g
<class 'pandas.core.frame.DataFrame'>
---------------expand=False--------------------
0 [a, b, c, f, j]
1 [c, d, e, f, h]
2 NaN
3 [f, g, h, x, g]
dtype: object
<class 'pandas.core.series.Series'>
##########################################################
---------------expand=True,n=1--------------------
0 1
0 a_b_c_f j
1 c_d_e_f h
2 NaN NaN
3 f_g_h_x g
---------------expand=False,n=1--------------------
0 [a_b_c_f, j]
1 [c_d_e_f, h]
2 NaN
3 [f_g_h_x, g]
dtype: object
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