为什么我的python代码抛出ValueErrors异常？

Why my python code throws ValueErrors exception?

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while RUN2:
chose = int(input('Type the option number from 1 to 6:'))

if chose == 1:
print(grossPayMsg())
print("Your gross pay is", grosspay(workhour, hourlywage))

elif chose == 2:
print(withHoldingsMsg())
print("Your withholdings is", withhd(workhour, hourlywage))

elif chose == 3:
print(federalTaxMsg())
print("Your Federal Tax is", fedtax(workhour, hourlywage))

elif chose == 4:
print(marylandTaxMsg())
print("Your Federal Tax is", mdtax(workhour, hourlywage))

elif chose == 5:
print(netPayMsg())
print("Your Federal Tax is", net(workhour, hourlywage))

elif chose == 6:
print ("Thank you for using. Goodbye!")
RUN2 = False

else:
print("/////// Invalid option number ///////")

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问：我怎样才能避免在按下回车键而不是输入选项号时出现如下值错误？我知道有些用户可以故意或意外地点击enter。有什么话可以避免吗？我只学了int(input)或input…

ValueError:无法将字符串转换为float

valueError:基为10的int()的文本无效：""

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提前非常感谢你……