@taemoojin9 이렇게 해보세요.

https://support.globalsign.com/customer/portal/articles/1224583-root-intermediate-certificate-bundles

아래 내용을 c:/Python27/Lib/site-packages/certifi/cacert.pem 파일의 마지막에 copy & paste 해보세요.

-----BEGIN CERTIFICATE-----
MIIDdTCCAl2gAwIBAgILBAAAAAABFUtaw5QwDQYJKoZIhvcNAQEFBQAwVzELMAkG
A1UEBhMCQkUxGTAXBgNVBAoTEEdsb2JhbFNpZ24gbnYtc2ExEDAOBgNVBAsTB1Jv
b3QgQ0ExGzAZBgNVBAMTEkdsb2JhbFNpZ24gUm9vdCBDQTAeFw05ODA5MDExMjAw
MDBaFw0yODAxMjgxMjAwMDBaMFcxCzAJBgNVBAYTAkJFMRkwFwYDVQQKExBHbG9i
YWxTaWduIG52LXNhMRAwDgYDVQQLEwdSb290IENBMRswGQYDVQQDExJHbG9iYWxT
aWduIFJvb3QgQ0EwggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIBAQDaDuaZ
jc6j40+Kfvvxi4Mla+pIH/EqsLmVEQS98GPR4mdmzxzdzxtIK+6NiY6arymAZavp
xy0Sy6scTHAHoT0KMM0VjU/43dSMUBUc71DuxC73/OlS8pF94G3VNTCOXkNz8kHp
1Wrjsok6Vjk4bwY8iGlbKk3Fp1S4bInMm/k8yuX9ifUSPJJ4ltbcdG6TRGHRjcdG
snUOhugZitVtbNV4FpWi6cgKOOvyJBNPc1STE4U6G7weNLWLBYy5d4ux2x8gkasJ
U26Qzns3dLlwR5EiUWMWea6xrkEmCMgZK9FGqkjWZCrXgzT/LCrBbBlDSgeF59N8
9iFo7+ryUp9/k5DPAgMBAAGjQjBAMA4GA1UdDwEB/wQEAwIBBjAPBgNVHRMBAf8E
BTADAQH/MB0GA1UdDgQWBBRge2YaRQ2XyolQL30EzTSo//z9SzANBgkqhkiG9w0B
AQUFAAOCAQEA1nPnfE920I2/7LqivjTFKDK1fPxsnCwrvQmeU79rXqoRSLblCKOz
yj1hTdNGCbM+w6DjY1Ub8rrvrTnhQ7k4o+YviiY776BQVvnGCv04zcQLcFGUl5gE
38NflNUVyRRBnMRddWQVDf9VMOyGj/8N7yy5Y0b2qvzfvGn9LhJIZJrglfCm7ymP
AbEVtQwdpf5pLGkkeB6zpxxxYu7KyJesF12KwvhHhm4qxFYxldBniYUr+WymXUad
DKqC5JlR3XC321Y9YeRq4VzW9v493kHMB65jUr9TU/Qr6cf9tveCX4XSQRjbgbME
HMUfpIBvFSDJ3gyICh3WZlXi/EjJKSZp4A==
-----END CERTIFICATE-----
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----