your system have two python installation one with anaconda and one directly, so when you are pip installing streamlit, it is being installed in the site-package of python 3.6 rather than anaconda’s python interpreter it could be possible if your environment is not properly activated. you can check “pip --version” and it will point out from where this pip is running if it shows the path to python intrepreter from python36 and not from anaconda then the issue is with the python installation you can try to install python from system as anaconda has its own python intrepreter
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