Why i can't use cmd to open the psychopy builder?even if i add the env to windows

Other
1

once i install the psychopy and then i uninstall it,like the question i say,can anyone help me?
Traceback (most recent call last):
** File “”, line 1, in **
NameError: name ‘psychopy’ is not defined
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2

Not a big problem, but it bothers me a lot, thank you for your help