python - 如何检查是否缺少参数

Question

我写了这段代码:

def suma(num1,num2):

    if(isinstance(num1,int)) or (isinstance(num2,int)) :
       if num1<0 or num2<0:
            print("iavo")
       elif num1!=int(num1)or num2!=int(num2):
            print("iao")
       else:
            suma_a = num1+num2
            return suma_a
    else:
        print("ia")

我需要检查是否有 num1 或 num2。如果没有，程序应该打印出缺少参数。

Answer 1

如果您没有分配默认值并且用户没有提供两个参数，您将在进入函数之前得到一个TypeError: suma() missing 1 required positional argument:

def suma(num1=None,num2=None):
     # make sure user has entered two args and both are numbers
    if num1 is None or num2 is None:
        return "You Must choose two numbers"
    # rest of code