Reduce redundancy in python docs

This is a followup to PR OpenAPITools#5094, which had a few unresolved comments at
merge time. This reduces the amount of redundant lines in the api
example doc templates, and ensures that referenced Configuration objects
are actually instantiated.

modules/openapi-generator/src/main/resources/python/api_doc_example.mustache

@@ -5,24 +5,17 @@ import {{{packageName}}}
 from {{{packageName}}}.rest import ApiException
 from pprint import pprint
 {{> python_doc_auth_partial}}
-{{#hasAuthMethods}}
-# Defining host is optional and default to {{{basePath}}}
-configuration.host = "{{{basePath}}}"
 # Enter a context with an instance of the API client
+{{#hasAuthMethods}}
 with {{{packageName}}}.ApiClient(configuration) as api_client:
-    # Create an instance of the API class
-    api_instance = {{{packageName}}}.{{{classname}}}(api_client)
-    {{#allParams}}{{paramName}} = {{{example}}} # {{{dataType}}} | {{{description}}}{{^required}} (optional){{/required}}{{#defaultValue}} (default to {{{.}}}){{/defaultValue}}
-    {{/allParams}}
 {{/hasAuthMethods}}
 {{^hasAuthMethods}}
-# Enter a context with an instance of the API client
 with {{{packageName}}}.ApiClient() as api_client:
+{{/hasAuthMethods}}
     # Create an instance of the API class
     api_instance = {{{packageName}}}.{{{classname}}}(api_client)
     {{#allParams}}{{paramName}} = {{{example}}} # {{{dataType}}} | {{{description}}}{{^required}} (optional){{/required}}{{#defaultValue}} (default to {{{.}}}){{/defaultValue}}
     {{/allParams}}
-{{/hasAuthMethods}}
 
     try:
     {{#summary}}    # {{{.}}}

modules/openapi-generator/src/main/resources/python/python-experimental/api_doc_example.mustache

@@ -4,20 +4,15 @@ import time
 import {{{packageName}}}
 from pprint import pprint
 {{> python_doc_auth_partial}}
-{{#hasAuthMethods}}
-# Defining host is optional and default to {{{basePath}}}
-configuration.host = "{{{basePath}}}"
 # Enter a context with an instance of the API client
+{{#hasAuthMethods}}
 with {{{packageName}}}.ApiClient(configuration) as api_client:
-    # Create an instance of the API class
-    api_instance = {{{packageName}}}.{{{classname}}}(api_client)
 {{/hasAuthMethods}}
 {{^hasAuthMethods}}
-# Enter a context with an instance of the API client
-with {{{packageName}}}.ApiClient(configuration) as api_client:
+with {{{packageName}}}.ApiClient() as api_client:
+{{/hasAuthMethods}}
     # Create an instance of the API class
     api_instance = {{{packageName}}}.{{{classname}}}(api_client)
-{{/hasAuthMethods}}
     {{#requiredParams}}{{^defaultValue}}{{paramName}} = {{{example}}} # {{{dataType}}} | {{{description}}}
     {{/defaultValue}}{{/requiredParams}}{{#optionalParams}}{{paramName}} = {{{example}}} # {{{dataType}}} | {{{description}}}{{^required}} (optional){{/required}}{{#defaultValue}} if omitted the server will use the default value of {{{defaultValue}}}{{/defaultValue}}
     {{/optionalParams}}

modules/openapi-generator/src/main/resources/python/python_doc_auth_partial.mustache

@@ -45,4 +45,7 @@ configuration.api_key['{{{keyParamName}}}'] = 'YOUR_API_KEY'
 configuration.access_token = 'YOUR_ACCESS_TOKEN'
 {{/isOAuth}}
 {{/authMethods}}
+
+# Defining host is optional and default to {{{basePath}}}
+configuration.host = "{{{basePath}}}"
 {{/hasAuthMethods}}