ak.fields
=========

Defined in `awkward.operations.ak_fields <https://github.com/scikit-hep/awkward/blob/ff40640990e1c1c5630e7e8b8e37a79ca18d3eeb/src/awkward/operations/ak_fields.py>`__ on `line 15 <https://github.com/scikit-hep/awkward/blob/ff40640990e1c1c5630e7e8b8e37a79ca18d3eeb/src/awkward/operations/ak_fields.py#L15>`__.

.. py:function:: ak.fields(array)

   Returns a list of field names or tuple slot numbers for the outermost record.

   If the array contains nested records, only the outermost record is
   queried. If it contains tuples instead of records, this function outputs
   string representations of integers, such as ``"0"``, ``"1"``, ``"2"``, etc.
   The records or tuples may be within multiple layers of nested lists.

   If the array contains neither tuples nor records, this returns an empty
   list.

   :param array: Array-like data (anything :py:obj:`ak.to_layout` recognizes).

   :returns: A list of the field names (or tuple slot numbers) of the outermost record of
             ``array`` (many types supported, including all Awkward Arrays and Records).