Underscores in Python

Fatma Kahveci
Coding
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_<variable>

  • A naming convention
  • For internal use (like protected)

<variable>_

  • When the most fitting name is already taken by a keyword.

__<variable>

  • Triggers name mangling when used for class attributes,
    • __<variable_name>
    • __<method_name>
  • Enforced by the Python interpreter.
  • Treat it like private

__<variable>__

  • Indicates special methods defined by the Python language.
    • Commonly used for operator overloading
  • Avoid this naming scheme for your attributes.
  • double underscore:= dunder

_

  • It indicates that a variable is temporary or insignificant.

Ref

Name mangling

  • Python’s private and protected members can be accessed outside the class through name mangling.