How to run a loop till half of the string...without using inbuilt function

[krish]

please give a runnabl sample of your code with the full error text or a clear description of the problem

I know, i was asking some basic question...but i am new to python launguage and not able to crack this basic code..please help me.thanq

str="titit"
a=len(str)
for l in str[:a/2]
    for m in str[a,-1]:
        if l==m:
            if l!=len(str)/2:
                break
            else:
                
        else:
            print("not a palindrome")

Error:
File "<ipython-input-120-c3db7da8370e>", line 3
    for l in str[:a/2]
                      ^
SyntaxError: invalid syntax

[nilamo]

Constructs which start a block (for loops, while loops, if, elif, else, def, etc) all need a colon at the end of the line.  The arrow is pointing to where the colon is expected to be.