how can I initialize this code ?

[metulburr]

I indented the lines 4 spaces to the right.

I said dedent to the left, not indent to the right. It has to be all the way to the left.

I got an error since "shorpath" hasnt been given a value!

it has been given a value, but it takes 2 parameters start and end

def shortpath(self, start, end):

Currently the code does not show anything so you need to print it to see the results.

def main():
    gg = Graph()
    path = gg.shortpath('C', 'I')
    print(path)

if __name__ == '__main__':
    main()

Output:
$ python3 test6.py
['I']