Question

我是python的初学者，但我没有成功使此过程正常运行。谁能帮忙吗？ If和Elif构成无效的语法，我该怎么办？

我正在使用Python3.7.2 Shell IDLE

1。将华氏温度转换为摄氏温度，并将摄氏温度转换为华氏温度

temp = input("Input the  temperature you like to convert? (e.g.,45F, 102C etc.) : ")

degree = int(temp[:-1])
i_convention = temp[-1]

if i_convention.upper() == "C":
  result = int(round((9 * degree) / 5+32))
  o_convention = "Fahrenheit"
  print("The temperature in", o_convention, "is", result, "degrees.")

elif i_convention.upper() =="F":
  result = int(round((degree - 32) * 5 / 9))
  o_convention ="Celsius"
  print("The temperature in", o_convention, "is", result, "degrees.")

else:
  #Nul

print("Pas de resultat valide")

Answer 1

您可以使用pass在python中创建一个空块。

编辑：刚刚意识到最终的打印语句应该是一条错误消息，因此，如果您只修复最后一部分的格式，我认为它是可行的。

temp = input("Input the  temperature you like to convert? (e.g.,45F, 102C etc.) : ")

degree = int(temp[:-1])
i_convention = temp[-1]

if i_convention.upper() == "C":
  result = int(round((9 * degree) / 5+32))
  o_convention = "Fahrenheit"
  print("The temperature in", o_convention, "is", result, "degrees.")

elif i_convention.upper() =="F":
  result = int(round((degree - 32) * 5 / 9))
  o_convention ="Celsius"
  print("The temperature in", o_convention, "is", result, "degrees.")

else:
  print("Pas de resultat valide")

Answer 2

您需要在else:块中放置一些内容，Python解释器才能正常运行。

如果您从用户那里获得的输入对您的脚本无效，我建议将一些错误处理传递给else:块。否则，请尝试将代码重构为如下形式：

temp = input("Input the  temperature you like to convert? (e.g.,45F, 102C etc.) : ")

degree = int(temp[:-1])
i_convention = temp[-1]

if i_convention.upper() == "C":
    result = int(round((9 * degree) / 5+32))
    o_convention = "Fahrenheit"
    print("The temperature in", o_convention, "is", result, "degrees.")

else:
    result = int(round((degree - 32) * 5 / 9))
    o_convention ="Celsius"
    print("The temperature in", o_convention, "is", result, "degrees.")

print("Pas de resultat valide")

我建议将输入语句包装到while循环中以验证用户输入。

temp = None
while temp[-1].upper() != "C" && temp[-1].upper() != "F"
    temp = temp = input("Input the  temperature you like to convert? (e.g.,45F, 102C etc.) : ")

# Put if, else statements below

我在让If_Elif处理我的Python代码时遇到问题

2 个答案: