根据 cell 的类型来获取值，并转换为字符串

format_xls_name.py

def get_cell_value(sheet,row,col):
	# Cell Types: 0=Empty, 1=Text, 2=Number, 3=Date,4=Boolean,5=Error,6=Blank
	cell_type = sheet.cell_type(row,col)
	if 1 == cell_type:
		value = sheet.cell_value(row,col)
	if 2 == cell_type:
		value = u"%s" %(sheet.cell_value(row,col))
	return value