Python类类型变量命名规范及函数类入参命名规则咨询

Great questions! Let's dive into Python's style best practices here—this all boils down to readability and community conventions rooted in PEP 8:

First, remember PEP 8 mandates UpperCamelCase for class names themselves. For variables that point to classes, the naming depends on how you intend to use the variable:

• If it's a temporary or local reference (like shortening a long class name for convenience in a small scope), stick to standard variable naming: snake_case. For example:

  # Local reference to a class, snake_case keeps it consistent with regular variables
  user_cls = UserProfileModel
  new_user = user_cls(name="Bob", age=30)
  

• If it's a permanent alias meant to be treated as a first-class class (like rebranding an external base class for your module's API), use UpperCamelCase to signal this is a class type, not a regular variable. For example:

  # Alias for a third-party class, treated as part of our module's class hierarchy
  CustomBase = ExternalFrameworkBaseClass
  

The core goal is clarity: if other developers should instantiate this variable or access class-level attributes, UpperCamelCase communicates that intent at a glance.

For function parameters that accept classes (not instances), we balance PEP 8's variable rules with clarity about the parameter's type:

• PEP 8 requires function parameters to use snake_case, so start there. Add a suffix like _class or use a clear identifier to signal this is a class, not an instance. Common choices include klass (since class is a reserved keyword), model_class, or base_class. For example:

  def setup_database(model_class, table_name):
      model_class._table = table_name
      # ... rest of initialization logic
  

• While you might see rare uses of UpperCamelCase for such parameters, this isn't standard. The priority is consistency with regular parameter naming, plus making it obvious that the argument is a class (not an instance) to anyone reading the code.

At the end of the day, consistency within your team or project beats strict adherence to any single rule—just make sure the naming makes the variable/parameter's purpose clear.

内容的提问来源于stack exchange，提问作者tobakudan