[python] Numpy ValueError: setting an array element with a sequence. This message may appear without the existing of a sequence?

You can try the expand option in Series.str.split('seperator', expand=True).
By default expand is False.

expand : bool, default False
Expand the splitted strings into separate columns.

  • If True, return DataFrame/MultiIndex expanding dimensionality.
  • If False, return Series/Index, containing lists of strings.

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