Python(openpyxl)：Excelの文字の出現回数カウント

import openpyxl

wb = openpyxl.load_workbook('C:/Users/xxx/Desktop/test/test.xlsx')
ws = wb['Sheet1']

#検索対象の文字列
My_Value = ['左ルー','千葉県','田']
Result_Count = []

for list in My_Value:
    i = 0
    for row in ws.iter_rows():
        for cell in row:
            if list in str(cell.value):
                i = i + 1
    Result_Count.append(i)

print(My_Value)
print(Result_Count)

#別名で保存
wb.save('C:/Users/xxx/Desktop/test/testデータ出現個数.xlsx')