How to give document property value into Table.Select()

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For example: in the table below i want to find sales corresponding to period 2017-2 (i.e. 300)


Period Sales
2017-1 400
2017-2 300
2017-3 500

I am able to get it using the answer :

from Spotfire.Dxp.Data import *
from System.Collections.Generic import List

# select an expression to limit the data in a table 
rowSelection=table.Select('Period = "2017-2"')

# Create a cursor to the Column we wish to get the values from
cursor = DataValueCursor.CreateFormatted(table.Columns["Sales"])

# Create List object that will hold values

# Loop through all rows, retrieve value for specific column,
# and add value into list
for  row in  table.GetRows(rowSelection.AsIndexSet(),cursor):
   rowIndex = row.Index
   value1 = cursor.CurrentValue

for val in listofValues:
	print val

but in line 6, can anyone tell me how to specify an value of document property instead of "2017-2" ? 

(1) Answer