secret secretom, уточните в вопросе используемую операционную систему и версии используемого программного обеспечения. И если это неполный трэйсбэк, выложите полный.
Collecting numpy
WARNING: Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLCertVerificationError(1, '[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local issuer certificate (_ssl.c:1108)'))': /packages/5c/28/32ca028c2dcaa3f180dcc59266d6856d3e24f63ca96b8fc4af9bdbd4ae04/numpy-1.17.4-cp38-cp38-win32.whl
WARNING: Retrying (Retry(total=3, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLCertVerificationError(1, '[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local issuer certificate (_ssl.c:1108)'))': /packages/5c/28/32ca028c2dcaa3f180dcc59266d6856d3e24f63ca96b8fc4af9bdbd4ae04/numpy-1.17.4-cp38-cp38-win32.whl
WARNING: Retrying (Retry(total=2, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLCertVerificationError(1, '[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local issuer certificate (_ssl.c:1108)'))': /packages/5c/28/32ca028c2dcaa3f180dcc59266d6856d3e24f63ca96b8fc4af9bdbd4ae04/numpy-1.17.4-cp38-cp38-win32.whl
WARNING: Retrying (Retry(total=1, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLCertVerificationError(1, '[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local issuer certificate (_ssl.c:1108)'))': /packages/5c/28/32ca028c2dcaa3f180dcc59266d6856d3e24f63ca96b8fc4af9bdbd4ae04/numpy-1.17.4-cp38-cp38-win32.whl
WARNING: Retrying (Retry(total=0, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLCertVerificationError(1, '[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local issuer certificate (_ssl.c:1108)'))': /packages/5c/28/32ca028c2dcaa3f180dcc59266d6856d3e24f63ca96b8fc4af9bdbd4ae04/numpy-1.17.4-cp38-cp38-win32.whl
ERROR: Could not install packages due to an EnvironmentError: HTTPSConnectionPool(host='files.pythonhosted.org', port=443): Max retries exceeded with url: /packages/5c/28/32ca028c2dcaa3f180dcc59266d6856d3e24f63ca96b8fc4af9bdbd4ae04/numpy-1.17.4-cp38-cp38-win32.whl (Caused by SSLError(SSLCertVerificationError(1, '[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local issuer certificate (_ssl.c:1108)')))