Python. function 中的反向字符串

Question

def rev(somestring):


    if somestring is None:
        return somestring
    if (len(somestring)) <=1:
        return somestring

    return rev(somestring[1:]+somestring[0])

somestring = "house"
print(rev(somestring))

###does anyone know what I may be doing wrong

Answer 1

The problem with your code is that you have + somestring[0] inside the rev method invocation. In other words change that line to...

return rev(somestring[1:])+somestring[0]