class_docstr: Determines the middlemost number in a list of values.
  
  Examples:
      >>> median = Median()
      >>> median([5, 3, 2, 1, 4])
      3.0
  
      `NaN` values are ignored.
  
      >>> median([5, 3, 2, 1, 4, None])
      3.0
code: def get_function(self, agg_type=Library.PANDAS):
      return pd.Series.median
  
imports: import pandas
  from woodwork.column_schema import ColumnSchema
  from featuretools.primitives.base.aggregation_primitive_base import AggregationPrimitive
  from featuretools.utils.gen_utils import Library
label_desc: Use image node_id 1 for calling the Median obj's underlying member method code with example usage: obj.get_function(agg_type) and returns: pd