old_contents: from pydantic import BaseModel
  
  
  class Person(BaseModel):
      name: str
      age: int
  
      class Config:
          schema_extra = {
              "examples": [
                  {
                      "name": "John Doe",
                      "age": 25,
                  }
              ]
          }
  
  
  print(Person.schema())
  # {'title': 'Person',
  #  'type': 'object',
  #  'properties': {'name': {'title': 'Name', 'type': 'string'},
  #   'age': {'title': 'Age', 'type': 'integer'}},
  #  'required': ['name', 'age'],
  #  'examples': [{'name': 'John Doe', 'age': 25}]}
  print(Person.schema_json(indent=2))
  
new_contents: from pydantic import BaseModel
  
  
  class Person(BaseModel):
      name: str
      age: int
  
      class Config:
          schema_extra = {
              'examples': [
                  {
                      'name': 'John Doe',
                      'age': 25,
                  }
              ]
          }
  
  
  print(Person.schema())
  # {'title': 'Person',
  #  'type': 'object',
  #  'properties': {'name': {'title': 'Name', 'type': 'string'},
  #   'age': {'title': 'Age', 'type': 'integer'}},
  #  'required': ['name', 'age'],
  #  'examples': [{'name': 'John Doe', 'age': 25}]}
  print(Person.schema_json(indent=2))
  
subject: Fix double quotes to single quotes