docstr: The 'header' property is an instance of Header
  that may be specified as:
    - An instance of :class:`plotly.graph_objs.table.Header`
    - A dict of string/value properties that will be passed
      to the Header constructor
  
      Supported dict properties:
  
          align
              Sets the horizontal alignment of the `text`
              within the box. Has an effect only if `text`
              spans two or more lines (i.e. `text` contains
              one or more <br> HTML tags) or if an explicit
              width is set to override the text width.
          alignsrc
              Sets the source reference on Chart Studio Cloud
              for `align`.
          fill
              :class:`plotly.graph_objects.table.header.Fill`
              instance or dict with compatible properties
          font
              :class:`plotly.graph_objects.table.header.Font`
              instance or dict with compatible properties
          format
              Sets the cell value formatting rule using d3
              formatting mini-languages which are very
              similar to those in Python. For numbers, see: h
              ttps://github.com/d3/d3-format/tree/v1.4.5#d3-
              format.
          formatsrc
              Sets the source reference on Chart Studio Cloud
              for `format`.
          height
              The height of cells.
          line
              :class:`plotly.graph_objects.table.header.Line`
              instance or dict with compatible properties
          prefix
              Prefix for cell values.
          prefixsrc
              Sets the source reference on Chart Studio Cloud
              for `prefix`.
          suffix
              Suffix for cell values.
          suffixsrc
              Sets the source reference on Chart Studio Cloud
              for `suffix`.
          values
              Header cell values. `values[m][n]` represents
              the value of the `n`th point in column `m`,
              therefore the `values[m]` vector length for all
              columns must be the same (longer vectors will
              be truncated). Each value must be a finite
              number or a string.
          valuessrc
              Sets the source reference on Chart Studio Cloud
              for `values`.
  
  Returns
  -------
  plotly.graph_objs.table.Header
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code: def header(self):
      """
      The 'header' property is an instance of Header
      that may be specified as:
        - An instance of :class:`plotly.graph_objs.table.Header`
        - A dict of string/value properties that will be passed
          to the Header constructor
  
          Supported dict properties:
  
              align
                  Sets the horizontal alignment of the `text`
                  within the box. Has an effect only if `text`
                  spans two or more lines (i.e. `text` contains
                  one or more <br> HTML tags) or if an explicit
                  width is set to override the text width.
              alignsrc
                  Sets the source reference on Chart Studio Cloud
                  for `align`.
              fill
                  :class:`plotly.graph_objects.table.header.Fill`
                  instance or dict with compatible properties
              font
                  :class:`plotly.graph_objects.table.header.Font`
                  instance or dict with compatible properties
              format
                  Sets the cell value formatting rule using d3
                  formatting mini-languages which are very
                  similar to those in Python. For numbers, see: h
                  ttps://github.com/d3/d3-format/tree/v1.4.5#d3-
                  format.
              formatsrc
                  Sets the source reference on Chart Studio Cloud
                  for `format`.
              height
                  The height of cells.
              line
                  :class:`plotly.graph_objects.table.header.Line`
                  instance or dict with compatible properties
              prefix
                  Prefix for cell values.
              prefixsrc
                  Sets the source reference on Chart Studio Cloud
                  for `prefix`.
              suffix
                  Suffix for cell values.
              suffixsrc
                  Sets the source reference on Chart Studio Cloud
                  for `suffix`.
              values
                  Header cell values. `values[m][n]` represents
                  the value of the `n`th point in column `m`,
                  therefore the `values[m]` vector length for all
                  columns must be the same (longer vectors will
                  be truncated). Each value must be a finite
                  number or a string.
              valuessrc
                  Sets the source reference on Chart Studio Cloud
                  for `values`.
  
      Returns
      -------
      plotly.graph_objs.table.Header
      """
      return self["header"]
  
imports: from plotly.basedatatypes import BaseTraceType
  import copy
label_desc: Use image node_id 17 for calling the Table obj's underlying member method code with example usage: obj.header() and returns: self