How to remove the first occurence of a repeated Character with python

I have been given the following string 'abcdea' and I need to find the repeated character but remove the first one so the result most be 'bcdea' I have tried to following but only get this result

def remove_rep(x):
    new_list = []
    for i in x:
        if i not in new_list:
            new_list.append(i)
    new_list = ''.join(new_list)
    print(new_list)

remove_rep('abcdea')

and the result is 'abcde' not the one that I was looking 'bcdea'

>Solution :

Change

new_list = ''.join(new_list)

to

new_list = ''.join(new_list[1:]+[i])

(and figure out why! Hint: what’s the condition of your if block? What are you checking for and why?)