function str() 不起作用，我不知道该怎么办

Question

I have the code:

def rides(x):
   return list(str(x))

When I input the word hi without any quotes

It returns the error that hi is not defined

However when input integers or hi with quotes it works, but I need it to work for hi without quotes.

Answer 1

When your input is hi without quotes, it means you pass a variable named hi to your function. If you don't define such variable before passing it to your function, your code will fail during it's evaluation with NameError error.