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Python Python Collections (2016, retired 2019) Slices sillyCase

Do I wrong something?

I tested this code by using workspace, it worked but not in challenge.

sillycase.py
def sillycase(string):
    string = 'treehouse'
    do_cased = string[:4]
    up_cased = string[4:]
    return do_cased.lower() + up_cased.upper()

If you move

string = 'treehouse'

to the top, outside of your function, it should pass. Otherwise you get a NameError due to the string not already being defined. If not, let me know.