# python3 -m openapi_spec_validator openapi.json 
'_io.BufferedReader' object has no attribute 'decode'

# python3 --version
Python 3.7.3
Requirement already satisfied: openapi-spec-validator in ./ucs-test-udm-rest-api/lib/python3.7/site-packages (0.5.6)
Requirement already satisfied: importlib-resources<6.0.0,>=5.8.0 in ./ucs-test-udm-rest-api/lib/python3.7/site-packages (from openapi-spec-validator) (5.12.0)                                                                                
Requirement already satisfied: jsonschema<4.18.0,>=4.0.0 in ./ucs-test-udm-rest-api/lib/python3.7/site-packages (from openapi-spec-validator) (4.17.3)                                                                                        
Requirement already satisfied: jsonschema-spec<0.2.0,>=0.1.1 in ./ucs-test-udm-rest-api/lib/python3.7/site-packages (from openapi-spec-validator) (0.1.4)                                                                                     
Requirement already satisfied: lazy-object-proxy<2.0.0,>=1.7.1 in ./ucs-test-udm-rest-api/lib/python3.7/site-packages (from openapi-spec-validator) (1.9.0)                                                                                   
Requirement already satisfied: openapi-schema-validator<0.5.0,>=0.4.2 in ./ucs-test-udm-rest-api/lib/python3.7/site-packages (from openapi-spec-validator) (0.4.4)                                                                            
Requirement already satisfied: zipp>=3.1.0 in ./ucs-test-udm-rest-api/lib/python3.7/site-packages (from importlib-resources<6.0.0,>=5.8.0->openapi-spec-validator) (3.15.0)                                                                   
Requirement already satisfied: attrs>=17.4.0 in ./ucs-test-udm-rest-api/lib/python3.7/site-packages (from jsonschema<4.18.0,>=4.0.0->openapi-spec-validator) (23.1.0)                                                                         
Requirement already satisfied: importlib-metadata in ./ucs-test-udm-rest-api/lib/python3.7/site-packages (from jsonschema<4.18.0,>=4.0.0->openapi-spec-validator) (6.6.0)                                                                     
Requirement already satisfied: pkgutil-resolve-name>=1.3.10 in ./ucs-test-udm-rest-api/lib/python3.7/site-packages (from jsonschema<4.18.0,>=4.0.0->openapi-spec-validator) (1.3.10)                                                          
Requirement already satisfied: pyrsistent!=0.17.0,!=0.17.1,!=0.17.2,>=0.14.0 in ./ucs-test-udm-rest-api/lib/python3.7/site-packages (from jsonschema<4.18.0,>=4.0.0->openapi-spec-validator) (0.19.3)                                         
Requirement already satisfied: typing-extensions in ./ucs-test-udm-rest-api/lib/python3.7/site-packages (from jsonschema<4.18.0,>=4.0.0->openapi-spec-validator) (4.6.3)                                                                      
Requirement already satisfied: PyYAML>=5.1 in ./ucs-test-udm-rest-api/lib/python3.7/site-packages (from jsonschema-spec<0.2.0,>=0.1.1->openapi-spec-validator) (6.0)                                                                          
Requirement already satisfied: pathable<0.5.0,>=0.4.1 in ./ucs-test-udm-rest-api/lib/python3.7/site-packages (from jsonschema-spec<0.2.0,>=0.1.1->openapi-spec-validator) (0.4.3)                                                             
Requirement already satisfied: rfc3339-validator in ./ucs-test-udm-rest-api/lib/python3.7/site-packages (from openapi-schema-validator<0.5.0,>=0.4.2->openapi-spec-validator) (0.1.4)                                                         
Requirement already satisfied: six in ./ucs-test-udm-rest-api/lib/python3.7/site-packages (from rfc3339-validator->openapi-schema-validator<0.5.0,>=0.4.2->openapi-spec-validator) (1.16.0)