Agregar pip a la ruta
import os
import sys
pipPath = f'{os.path.dirname(sys.executable)}\\Scripts'
os.system(f'setx PATH "%PATH%;{pipPath}"')
garzj
import os
import sys
pipPath = f'{os.path.dirname(sys.executable)}\\Scripts'
os.system(f'setx PATH "%PATH%;{pipPath}"')python -m pip install [packagename]
setx PATH "%PATH%;C:\Python34\Scripts"