Python 2.7.10：除了使用len（）以外，还有其他方法可以检查输入是否为空

Question

I am currently trying to make a maths quiz and I am working on trying to make the program not crash when the user doesn't answer a question(leaving the user input empty).This is what I have so far

    useranswer=raw_input("what is 8-5?")
    length=len(useranswer)

    while length<=0:
      useranswer=raw_input("please enter answer")
      length=len(useranswer)

    if int(useranswer)==3:
      print "correct"
    else:
      print"sorry wrong"

right now I'm using the method of checking the length of the useranswer using len(useranswer) to see if there is anything in the input but this only works if i use raw_input and not with a normal input .

I wanted to know if there is any other easier way of checking if the user input is empty with a different method? I have looked for answers from a few other stackoverflow questions but none of them seemed suitable.

Thankyou!

Answer 1

You can use

if useranswer:
    # do what you want to do here