Python lambda call function with output None

I want to implement something like use lambda

to call a function that has the output None or list and if it is a list then get the first value.

lambda x: func(x,args)[0] if func(x,args) is not None else None

      

        
        
        
      

    

However, this function seems to need to call the function twice to find out if it is None. Of course, I can just write the code using try or conditional statements:

def function(x):
    try: 
        return func(x,args)[0]
    except (IndexError,TypeError):
        return None

      

        
        
        
      

    

or just change the output func

. But I'm still wondering if there are any methods to call the function only once with lambda

.