$ pip install datamodel-code-generator

$ pip install datamodel-code-generator[http]

usage: datamodel-codegen [-h] [--input INPUT] [--url URL]
                         [--http-headers HTTP_HEADER [HTTP_HEADER ...]]
                         [--http-ignore-tls]
                         [--input-file-type {auto,openapi,jsonschema,json,yaml,dict,csv}]
                         [--openapi-scopes {schemas,paths} [{schemas,paths} ...]]
                         [--output OUTPUT] [--base-class BASE_CLASS]
                         [--field-constraints] [--use-annotated]
                         [--use_non_positive_negative_number_constrained_types]
                         [--field-extra-keys FIELD_EXTRA_KEYS [FIELD_EXTRA_KEYS ...]]
                         [--field-include-all-keys] [--snake-case-field]
                         [--strip-default-none]
                         [--disable-appending-item-suffix]
                         [--allow-population-by-field-name]
                         [--enable-faux-immutability] [--use-default]
                         [--force-optional] [--strict-nullable]
                         [--strict-types {str,bytes,int,float,bool} [{str,bytes,int,float,bool} ...]]
                         [--disable-timestamp] [--use-standard-collections]
                         [--use-generic-container-types]
                         [--use-schema-description] [--reuse-model]
                         [--enum-field-as-literal {all,one}]
                         [--set-default-enum-member]
                         [--empty-enum-field-name EMPTY_ENUM_FIELD_NAME]
                         [--class-name CLASS_NAME] [--use-title-as-name]
                         [--custom-template-dir CUSTOM_TEMPLATE_DIR]
                         [--extra-template-data EXTRA_TEMPLATE_DATA]
                         [--aliases ALIASES]
                         [--target-python-version {3.6,3.7,3.8,3.9}]
                         [--wrap-string-literal] [--validation]
                         [--encoding ENCODING] [--debug] [--version]

optional arguments:
  -h, --help            show this help message and exit
  --input INPUT         Input file/directory (default: stdin)
  --url URL             Input file URL. `--input` is ignore when `--url` is
                        used
  --http-headers HTTP_HEADER [HTTP_HEADER ...]
                        Set headers in HTTP requests to the remote host.
                        (example: "Authorization: Basic dXNlcjpwYXNz")
  --http-ignore-tls     Disable verification of the remote host's TLS
                        certificate
  --input-file-type {auto,openapi,jsonschema,json,yaml,dict,csv}
                        Input file type (default: auto)
  --openapi-scopes {schemas,paths} [{schemas,paths} ...]
                        Scopes of OpenAPI model generation (default: schemas)
  --output OUTPUT       Output file (default: stdout)
  --base-class BASE_CLASS
                        Base Class (default: pydantic.BaseModel)
  --field-constraints   Use field constraints and not con* annotations
  --use-annotated       Use typing.Annotated for Field(). Also, `--field-
                        constraints` option will be enabled.
  --use_non_positive_negative_number_constrained_types
                        Use the Non{Positive,Negative}{FloatInt} types instead of the corresponding con*
                        constrained types.
  --field-extra-keys FIELD_EXTRA_KEYS [FIELD_EXTRA_KEYS ...]
                        Add extra keys to field parameters
  --field-include-all-keys
                        Add all keys to field parameters
  --snake-case-field    Change camel-case field name to snake-case
  --strip-default-none  Strip default None on fields
  --disable-appending-item-suffix
                        Disable appending `Item` suffix to model name in an
                        array
  --allow-population-by-field-name
                        Allow population by field name
  --enable-faux-immutability
                        Enable faux immutability
  --use-default         Use default value even if a field is required
  --force-optional      Force optional for required fields
  --strict-nullable     Treat default field as a non-nullable field (Only
                        OpenAPI)
  --strict-types {str,bytes,int,float,bool} [{str,bytes,int,float,bool} ...]
                        Use strict types
  --disable-timestamp   Disable timestamp on file headers
  --use-standard-collections
                        Use standard collections for type hinting (list, dict)
  --use-generic-container-types
                        Use generic container types for type hinting
                        (typing.Sequence, typing.Mapping). If `--use-standard-
                        collections` option is set, then import from
                        collections.abc instead of typing
  --use-schema-description
                        Use schema description to populate class docstring
  --reuse-model         Re-use models on the field when a module has the model
                        with the same content
  --enum-field-as-literal {all,one}
                        Parse enum field as literal. all: all enum field type
                        are Literal. one: field type is Literal when an enum
                        has only one possible value
  --set-default-enum-member
                        Set enum members as default values for enum field
  --empty-enum-field-name EMPTY_ENUM_FIELD_NAME
                        Set field name when enum value is empty (default: `_`)
  --class-name CLASS_NAME
                        Set class name of root model
  --use-title-as-name   use titles as class names of models
  --custom-template-dir CUSTOM_TEMPLATE_DIR
                        Custom template directory
  --extra-template-data EXTRA_TEMPLATE_DATA
                        Extra template data
  --aliases ALIASES     Alias mapping file
  --target-python-version {3.6,3.7,3.8,3.9}
                        target python version (default: 3.7)
  --wrap-string-literal
                        Wrap string literal by using black `experimental-
                        string-processing` option (require black 20.8b0 or
                        later)
  --validation          Enable validation (Only OpenAPI)
  --encoding ENCODING   The encoding of input and output (default: UTF-8)
  --debug               show debug message
  --version             show version

# Generate models from a local file.
$ datamodel-codegen --input api.yaml --output model.py
# or directly from a URL.
$ datamodel-codegen --url https://<INPUT FILE URL> --output model.py