[Python] Python Creating Dictionary from excel data

I want to create a dictionary from the values, i get from excel cells, My code is below,

wb = xlrd.open_workbook('foo.xls')
sh = wb.sheet_by_index(2)
for i in range(138):
cell_value_class = sh.cell(i,2).value
cell_value_id = sh.cell(i,0).value


and I want to create a dictionary, like below, that consists of the values coming from the excel cells;

{'class1': 1, 'class2': 3, 'class3': 4, 'classN':N}


Any idea on how I can create this dictionary?

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