docker.images.push does not throw an exception on authentication failures

when calling images.push, I would expect an exception if the push fails for any reason. Instead a list of strings containing json(!) is returned.

In my case this was caused by using a credentials that were able to read the repository, but not to write on it.
I am using docker-py 7.1.0.

>>> d.images.push('registry.devops.company.de/sdm/devenv/docker/nds22:DMT')
'{"status":"The push refers to repository [registry.devops.company.de/sdm/devenv/docker/nds22]"}\r\n{"status":"Preparing","progressDetail":{},"id":"e13fc22196f7"}\r\n{"status":"Preparing","progressDetail":{},"id":"d3f568e44044"}\r\n{"status":"Preparing","progressDetail":{},"id":"20d52c42c0d2"}\r\n{"status":"Preparing","progressDetail":{},"id":"3b970ba98564"}\r\n{"status":"Preparing","progressDetail":{},"id":"a3fe5767be1f"}\r\n{"status":"Preparing","progressDetail":{},"id":"dc056a2a3bd7"}\r\n{"status":"Preparing","progressDetail":{},"id":"94edc0573192"}\r\n{"status":"Preparing","progressDetail":{},"id":"190bd049e69a"}\r\n{"status":"Preparing","progressDetail":{},"id":"c1278f9a1d1a"}\r\n{"status":"Preparing","progressDetail":{},"id":"c1278f9a1d1a"}\r\n{"status":"Preparing","progressDetail":{},"id":"284b4e718772"}\r\n{"status":"Preparing","progressDetail":{},"id":"17f90e156a5c"}\r\n{"status":"Preparing","progressDetail":{},"id":"0c0d9af5e66d"}\r\n{"status":"Preparing","progressDetail":{},"id":"b1809d9a4ad6"}\r\n{"status":"Preparing","progressDetail":{},"id":"d24d1c4d4104"}\r\n{"status":"Preparing","progressDetail":{},"id":"06e6efc8f7ad"}\r\n{"status":"Waiting","progressDetail":{},"id":"dc056a2a3bd7"}\r\n{"status":"Waiting","progressDetail":{},"id":"94edc0573192"}\r\n{"status":"Preparing","progressDetail":{},"id":"79a69a8c6a35"}\r\n{"status":"Waiting","progressDetail":{},"id":"190bd049e69a"}\r\n{"status":"Preparing","progressDetail":{},"id":"6fb0da284158"}\r\n{"status":"Waiting","progressDetail":{},"id":"c1278f9a1d1a"}\r\n{"status":"Preparing","progressDetail":{},"id":"0d9950f614d6"}\r\n{"status":"Preparing","progressDetail":{},"id":"fb793371e751"}\r\n{"status":"Preparing","progressDetail":{},"id":"22f8be0594d4"}\r\n{"status":"Preparing","progressDetail":{},"id":"b6cfde0b8194"}\r\n{"status":"Preparing","progressDetail":{},"id":"fc39326d9866"}\r\n{"status":"Preparing","progressDetail":{},"id":"f3779f3ebb98"}\r\n{"status":"Preparing","progressDetail":{},"id":"e524eb3d960d"}\r\n{"status":"Preparing","progressDetail":{},"id":"33bf517fef8b"}\r\n{"status":"Waiting","progressDetail":{},"id":"284b4e718772"}\r\n{"status":"Preparing","progressDetail":{},"id":"eeb727f8e4bb"}\r\n{"status":"Waiting","progressDetail":{},"id":"17f90e156a5c"}\r\n{"status":"Waiting","progressDetail":{},"id":"0c0d9af5e66d"}\r\n{"status":"Preparing","progressDetail":{},"id":"e6ebdd044b9c"}\r\n{"status":"Waiting","progressDetail":{},"id":"b1809d9a4ad6"}\r\n{"status":"Waiting","progressDetail":{},"id":"d24d1c4d4104"}\r\n{"status":"Preparing","progressDetail":{},"id":"5817476c92af"}\r\n{"status":"Waiting","progressDetail":{},"id":"06e6efc8f7ad"}\r\n{"status":"Preparing","progressDetail":{},"id":"06590ea36d6c"}\r\n{"status":"Waiting","progressDetail":{},"id":"79a69a8c6a35"}\r\n{"status":"Preparing","progressDetail":{},"id":"508a97bc2a5f"}\r\n{"status":"Waiting","progressDetail":{},"id":"6fb0da284158"}\r\n{"status":"Waiting","progressDetail":{},"id":"22f8be0594d4"}\r\n{"status":"Waiting","progressDetail":{},"id":"f3779f3ebb98"}\r\n{"status":"Preparing","progressDetail":{},"id":"80f4edff0ff6"}\r\n{"status":"Waiting","progressDetail":{},"id":"fc39326d9866"}\r\n{"status":"Waiting","progressDetail":{},"id":"0d9950f614d6"}\r\n{"status":"Waiting","progressDetail":{},"id":"b6cfde0b8194"}\r\n{"status":"Waiting","progressDetail":{},"id":"fb793371e751"}\r\n{"status":"Waiting","progressDetail":{},"id":"e524eb3d960d"}\r\n{"status":"Waiting","progressDetail":{},"id":"5817476c92af"}\r\n{"status":"Waiting","progressDetail":{},"id":"e6ebdd044b9c"}\r\n{"status":"Preparing","progressDetail":{},"id":"be3202997979"}\r\n{"status":"Waiting","progressDetail":{},"id":"33bf517fef8b"}\r\n{"status":"Waiting","progressDetail":{},"id":"eeb727f8e4bb"}\r\n{"status":"Waiting","progressDetail":{},"id":"06590ea36d6c"}\r\n{"status":"Preparing","progressDetail":{},"id":"638f2a99f7f3"}\r\n{"status":"Waiting","progressDetail":{},"id":"508a97bc2a5f"}\r\n{"status":"Waiting","progressDetail":{},"id":"80f4edff0ff6"}\r\n{"status":"Preparing","progressDetail":{},"id":"1f6ca1411ece"}\r\n{"status":"Waiting","progressDetail":{},"id":"be3202997979"}\r\n{"status":"Preparing","progressDetail":{},"id":"5efb24c93836"}\r\n{"status":"Waiting","progressDetail":{},"id":"1f6ca1411ece"}\r\n{"status":"Preparing","progressDetail":{},"id":"c6fb32907cb8"}\r\n{"status":"Waiting","progressDetail":{},"id":"5efb24c93836"}\r\n{"status":"Preparing","progressDetail":{},"id":"9d92b36b6f8d"}\r\n{"status":"Waiting","progressDetail":{},"id":"c6fb32907cb8"}\r\n{"status":"Preparing","progressDetail":{},"id":"7bce3075df58"}\r\n{"status":"Waiting","progressDetail":{},"id":"9d92b36b6f8d"}\r\n{"status":"Preparing","progressDetail":{},"id":"bcf30f7550b0"}\r\n{"status":"Waiting","progressDetail":{},"id":"7bce3075df58"}\r\n{"status":"Preparing","progressDetail":{},"id":"74ddd0ec08fa"}\r\n{"status":"Waiting","progressDetail":{},"id":"bcf30f7550b0"}\r\n{"status":"Waiting","progressDetail":{},"id":"74ddd0ec08fa"}\r\n{"status":"Layer already exists","progressDetail":{},"id":"20d52c42c0d2"}\r\n{"status":"Layer already exists","progressDetail":{},"id":"e13fc22196f7"}\r\n{"status":"Layer already exists","progressDetail":{},"id":"3b970ba98564"}\r\n{"status":"Layer already exists","progressDetail":{},"id":"d3f568e44044"}\r\n{"status":"Layer already exists","progressDetail":{},"id":"a3fe5767be1f"}\r\n{"status":"Layer already exists","progressDetail":{},"id":"dc056a2a3bd7"}\r\n{"status":"Layer already exists","progressDetail":{},"id":"c1278f9a1d1a"}\r\n{"status":"Layer already exists","progressDetail":{},"id":"284b4e718772"}\r\n{"status":"Layer already exists","progressDetail":{},"id":"190bd049e69a"}\r\n{"status":"Layer already exists","progressDetail":{},"id":"94edc0573192"}\r\n{"status":"Layer already exists","progressDetail":{},"id":"17f90e156a5c"}\r\n{"status":"Layer already exists","progressDetail":{},"id":"0c0d9af5e66d"}\r\n{"status":"Layer already exists","progressDetail":{},"id":"06e6efc8f7ad"}\r\n{"status":"Layer already exists","progressDetail":{},"id":"d24d1c4d4104"}\r\n{"status":"Layer already exists","progressDetail":{},"id":"b1809d9a4ad6"}\r\n{"status":"Layer already exists","progressDetail":{},"id":"79a69a8c6a35"}\r\n{"status":"Layer already exists","progressDetail":{},"id":"0d9950f614d6"}\r\n{"status":"Layer already exists","progressDetail":{},"id":"6fb0da284158"}\r\n{"status":"Layer already exists","progressDetail":{},"id":"22f8be0594d4"}\r\n{"status":"Layer already exists","progressDetail":{},"id":"fb793371e751"}\r\n{"status":"Layer already exists","progressDetail":{},"id":"b6cfde0b8194"}\r\n{"status":"Layer already exists","progressDetail":{},"id":"fc39326d9866"}\r\n{"status":"Layer already exists","progressDetail":{},"id":"f3779f3ebb98"}\r\n{"status":"Layer already exists","progressDetail":{},"id":"e524eb3d960d"}\r\n{"status":"Layer already exists","progressDetail":{},"id":"33bf517fef8b"}\r\n{"status":"Layer already exists","progressDetail":{},"id":"eeb727f8e4bb"}\r\n{"status":"Layer already exists","progressDetail":{},"id":"e6ebdd044b9c"}\r\n{"status":"Layer already exists","progressDetail":{},"id":"5817476c92af"}\r\n{"status":"Layer already exists","progressDetail":{},"id":"06590ea36d6c"}\r\n{"status":"Layer already exists","progressDetail":{},"id":"508a97bc2a5f"}\r\n{"status":"Layer already exists","progressDetail":{},"id":"80f4edff0ff6"}\r\n{"status":"Layer already exists","progressDetail":{},"id":"1f6ca1411ece"}\r\n{"status":"Layer already exists","progressDetail":{},"id":"be3202997979"}\r\n{"status":"Layer already exists","progressDetail":{},"id":"638f2a99f7f3"}\r\n{"status":"Layer already exists","progressDetail":{},"id":"5efb24c93836"}\r\n{"status":"Layer already exists","progressDetail":{},"id":"c6fb32907cb8"}\r\n{"status":"Layer already exists","progressDetail":{},"id":"9d92b36b6f8d"}\r\n{"status":"Layer already exists","progressDetail":{},"id":"7bce3075df58"}\r\n{"status":"Layer already exists","progressDetail":{},"id":"bcf30f7550b0"}\r\n{"status":"Layer already exists","progressDetail":{},"id":"74ddd0ec08fa"}\r\n{"errorDetail":{"message":"errors:\\ndenied: requested access to the resource is denied\\nunauthorized: authentication required\\n"},"error":"errors:\\ndenied: requested access to the resource is denied\\nunauthorized: authentication required\\n"}\r\n'

Start at the docker-py implementation of images.push and trace how its JSON response is handled, using the shown authentication-failure response as the reproduction. Add coverage for denied push credentials and verify that the call raises an exception rather than returning the response.