openpyxl.load_workbook（file，data_only = True不起作用？
问题内容：
为什么x =“ None”而不是“ 500”？我已尝试了所有已知的知识，并在1个小时内搜索了答案…谢谢您的帮助！
import openpyxl
wb = openpyxl.Workbook()
sheet = wb.active
sheet["A1"] = 200
sheet["A2"] = 300
sheet["A3"] = "=SUM(A1+A2)"
wb.save("writeFormula.xlsx")
wbFormulas = openpyxl.load_workbook("writeFormula.xlsx")
sheet = wbFormulas.active
print(sheet["A3"].value)
wbDataOnly = openpyxl.load_workbook("writeFormula.xlsx", data_only=True)
sheet = wbDataOnly.active
x = (sheet["A3"].value)
print(x) # None? Should print 500?
问题答案：
