[Python] Debug issues when using 'params' as name of query parameter

Description

It seems that the code generated for parameter handling in Python will end up creating a recursive params dictionary, if you have a query parameter called 'params'. This does not cause problems running the code normally, but will cause max recursion exception when debugging.

The easy work-around is to avoid 'params' as a parameter name.

Swagger-codegen version

Code generated with swagger-codegen-maven-plugin 2.2.2

Swagger declaration file content or url

    "/v1/instrumentParameters/{id}" : {
      "get" : {
        "summary" : "Get instrument params",
        "description" : "...",
        "operationId" : "getInstrumentParameters",
        "produces" : [ "application/json" ],
        "parameters" : [ {
          "name" : "id",
          "in" : "path",
          "description" : "...",
          "required" : true,
          "type" : "string"
        }, {
          "name" : "params",
          "in" : "query",
          "description" : "Parameters to return",
          "required" : false,
          "type" : "array",
          "items" : {
            "type" : "string",
            "enum" : [ "..." ]
          },
          "collectionFormat" : "multi"
        } ],
        "responses" : {
          "200" : {
            "description" : "successful operation",
            "schema" : {
              "type" : "object",
              "additionalProperties" : {
                "type" : "object"
              }
            }
          }
        }
      }
    }

Command line used for generation

Steps to reproduce

Related issues/PRs

Suggest a fix/enhancement

Start by generating the Python client from the Swagger declaration in the issue with swagger-codegen-maven-plugin 2.2.2, then inspect the generated parameter-handling code for the query parameter named "params". Confirm that normal execution works but debugging triggers a maximum-recursion exception; done means the generated client no longer creates a recursive params dictionary.