Close #1719 (#1730)

* Update Scalar.jinja2

* Update Scalar.jinja2 2

* Add test

generation datamodel from github graphql api https://docs.github.com/en/graphql/overview/public-schema

* Fix test test_main_graphql_github_api

* Remove test test_main_graphql_github_api

datamodel_code_generator/model/template/Scalar.jinja2

@@ -1,4 +1,6 @@
+{{ class_name }}: TypeAlias = {{ py_type }}
 {%- if description %}
-# {{ description }}
-{%- endif %}
-{{ class_name }}: TypeAlias = {{ py_type }}
+"""
+{{ description }}
+"""
+{%- endif %}

tests/data/expected/main/main_graphql_additional_imports/output_isort4.py

@@ -12,22 +12,28 @@
 
 from mymodule.myclass import MyCustomPythonClass
 
-# The `Boolean` scalar type represents `true` or `false`.
 Boolean: TypeAlias = bool
+"""
+The `Boolean` scalar type represents `true` or `false`.
+"""
 
 
 Date: TypeAlias = date
 
 
-# DateTime (ISO8601, example: 2020-01-01T10:11:12+00:00)
 DateTime: TypeAlias = datetime
+"""
+DateTime (ISO8601, example: 2020-01-01T10:11:12+00:00)
+"""
 
 
 MyCustomClass: TypeAlias = MyCustomPythonClass
 
 
-# The `String` scalar type represents textual data, represented as UTF-8 character sequences. The String type is most often used by GraphQL to represent free-form human-readable text.
 String: TypeAlias = str
+"""
+The `String` scalar type represents textual data, represented as UTF-8 character sequences. The String type is most often used by GraphQL to represent free-form human-readable text.
+"""
 
 
 class A(BaseModel):

tests/data/expected/main/main_graphql_additional_imports/output_isort5.py

@@ -11,22 +11,28 @@
 from pydantic import BaseModel, Field
 from typing_extensions import Literal
 
-# The `Boolean` scalar type represents `true` or `false`.
 Boolean: TypeAlias = bool
+"""
+The `Boolean` scalar type represents `true` or `false`.
+"""
 
 
 Date: TypeAlias = date
 
 
-# DateTime (ISO8601, example: 2020-01-01T10:11:12+00:00)
 DateTime: TypeAlias = datetime
+"""
+DateTime (ISO8601, example: 2020-01-01T10:11:12+00:00)
+"""
 
 
 MyCustomClass: TypeAlias = MyCustomPythonClass
 
 
-# The `String` scalar type represents textual data, represented as UTF-8 character sequences. The String type is most often used by GraphQL to represent free-form human-readable text.
 String: TypeAlias = str
+"""
+The `String` scalar type represents textual data, represented as UTF-8 character sequences. The String type is most often used by GraphQL to represent free-form human-readable text.
+"""
 
 
 class A(BaseModel):

tests/data/expected/main/main_graphql_custom_scalar_types/output.py

@@ -9,19 +9,25 @@
 from pydantic import BaseModel, Field
 from typing_extensions import Literal
 
-# The `Boolean` scalar type represents `true` or `false`.
 Boolean: TypeAlias = bool
+"""
+The `Boolean` scalar type represents `true` or `false`.
+"""
 
 
-# The `ID` scalar type represents a unique identifier, often used to refetch an object or as key for a cache. The ID type appears in a JSON response as a String; however, it is not intended to be human-readable. When expected as an input type, any string (such as `"4"`) or integer (such as `4`) input value will be accepted as an ID.
 ID: TypeAlias = str
+"""
+The `ID` scalar type represents a unique identifier, often used to refetch an object or as key for a cache. The ID type appears in a JSON response as a String; however, it is not intended to be human-readable. When expected as an input type, any string (such as `"4"`) or integer (such as `4`) input value will be accepted as an ID.
+"""
 
 
 Long: TypeAlias = int
 
 
-# The `String` scalar type represents textual data, represented as UTF-8 character sequences. The String type is most often used by GraphQL to represent free-form human-readable text.
 String: TypeAlias = str
+"""
+The `String` scalar type represents textual data, represented as UTF-8 character sequences. The String type is most often used by GraphQL to represent free-form human-readable text.
+"""
 
 
 class A(BaseModel):

tests/data/expected/main/main_graphql_different_types_of_fields/output.py

@@ -9,12 +9,16 @@
 from pydantic import BaseModel, Field
 from typing_extensions import Literal
 
-# The `Boolean` scalar type represents `true` or `false`.
 Boolean: TypeAlias = bool
+"""
+The `Boolean` scalar type represents `true` or `false`.
+"""
 
 
-# The `String` scalar type represents textual data, represented as UTF-8 character sequences. The String type is most often used by GraphQL to represent free-form human-readable text.
 String: TypeAlias = str
+"""
+The `String` scalar type represents textual data, represented as UTF-8 character sequences. The String type is most often used by GraphQL to represent free-form human-readable text.
+"""
 
 
 class A(BaseModel):

tests/data/expected/main/main_graphql_enums/output.py

@@ -7,12 +7,16 @@
 from enum import Enum
 from typing import TypeAlias
 
-# The `Boolean` scalar type represents `true` or `false`.
 Boolean: TypeAlias = bool
+"""
+The `Boolean` scalar type represents `true` or `false`.
+"""
 
 
-# The `String` scalar type represents textual data, represented as UTF-8 character sequences. The String type is most often used by GraphQL to represent free-form human-readable text.
 String: TypeAlias = str
+"""
+The `String` scalar type represents textual data, represented as UTF-8 character sequences. The String type is most often used by GraphQL to represent free-form human-readable text.
+"""
 
 
 class Color(Enum):

tests/data/expected/main/main_graphql_field_aliases/output.py

@@ -9,15 +9,19 @@
 from pydantic import BaseModel, Field
 from typing_extensions import Literal
 
-# The `Boolean` scalar type represents `true` or `false`.
 Boolean: TypeAlias = bool
+"""
+The `Boolean` scalar type represents `true` or `false`.
+"""
 
 
 DateTime: TypeAlias = str
 
 
-# The `String` scalar type represents textual data, represented as UTF-8 character sequences. The String type is most often used by GraphQL to represent free-form human-readable text.
 String: TypeAlias = str
+"""
+The `String` scalar type represents textual data, represented as UTF-8 character sequences. The String type is most often used by GraphQL to represent free-form human-readable text.
+"""
 
 
 class DateTimePeriod(BaseModel):