class_docstr: Determines the week of the year from a datetime.
  
  Description:
      Returns the week of the year from a datetime value. The first week
      of the year starts on January 1, and week numbers increment each
      Monday.
  
  Examples:
      >>> from datetime import datetime
      >>> dates = [datetime(2019, 1, 3),
      ...          datetime(2019, 6, 17, 11, 10, 50),
      ...          datetime(2019, 11, 30, 19, 45, 15)]
      >>> week = Week()
      >>> week(dates).tolist()
      [1, 25, 48]
code: def get_function(self):
      def week(vals):
          if hasattr(vals.dt, "isocalendar"):
              return vals.dt.isocalendar().week
          else:
              return vals.dt.week
  
      return week
  
imports: from woodwork.column_schema import ColumnSchema
  from woodwork.logical_types import Datetime, Ordinal
  from featuretools.primitives.base import TransformPrimitive
  from featuretools.utils.gen_utils import Library
label_desc: Use image node_id 1 for calling the Week obj's underlying member method code with example usage: obj.get_function() and returns: week, vals, vals