Question

I am writing code that reverses a string e.g. GOOD —> DOOG w/o using the reverse() function. I’m almost there…

a = "hello"

for i in range(1,len(a)+1): 

    print a[-i], 

When I complete the code with the join function, it doesn’t work as I expect. Any ideas why? Driving me nuts.

a = "hello"

for i in range(1,len(a)+1): 

    print ""join.a([-i],) 

Answer 1

You can reverse a string in one line like this:

a[::-1]

Slicing works like [start:stop:step]. So when you use -1 as the step, it prints the string in reverse.

>>> a = "hello"
>>> a[::-1]
'olleh'